16 files changed, 2760 insertions, 27 deletions
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 7a3ca4ec0cb7..5debc67df70a 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -57,18 +57,48 @@ config AD7298
 	  module will be called ad7298.
 
 config AD7476
-	tristate "Analog Devices AD7476 and similar 1-channel ADCs driver"
+	tristate "Analog Devices AD7476 1-channel ADCs driver and other similar devices from AD an TI"
 	depends on SPI
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help
-	  Say yes here to build support for Analog Devices AD7273, AD7274, AD7276,
-	  AD7277, AD7278, AD7475, AD7476, AD7477, AD7478, AD7466, AD7467, AD7468,
-	  AD7495, AD7910, AD7920, AD7920 SPI analog to digital converters (ADC).
+	  Say yes here to build support for the following SPI analog to
+	  digital converters (ADCs):
+	  Analog Devices: AD7273, AD7274, AD7276, AD7277, AD7278, AD7475,
+	  AD7476, AD7477, AD7478, AD7466, AD7467, AD7468, AD7495, AD7910,
+	  AD7920.
+	  Texas Instruments: ADS7866, ADS7867, ADS7868.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7476.
 
+config AD7606
+	tristate
+	select IIO_BUFFER
+	select IIO_TRIGGERED_BUFFER
+
+config AD7606_IFACE_PARALLEL
+	tristate "Analog Devices AD7606 ADC driver with parallel interface support"
+	depends on HAS_IOMEM
+	select AD7606
+	help
+	  Say yes here to build parallel interface support for Analog Devices:
+	  ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad7606_parallel.
+
+config AD7606_IFACE_SPI
+	tristate "Analog Devices AD7606 ADC driver with spi interface support"
+	depends on SPI
+	select AD7606
+	help
+	  Say yes here to build spi interface support for Analog Devices:
+	  ad7605-4, ad7606, ad7606-6, ad7606-4 analog to digital converters (ADC).
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called ad7606_spi.
+
 config AD7766
 	tristate "Analog Devices AD7766/AD7767 ADC driver"
 	depends on SPI_MASTER
@@ -81,6 +111,19 @@ config AD7766
 	  To compile this driver as a module, choose M here: the module will be
 	  called ad7766.
 
+config AD7768_1
+	tristate "Analog Devices AD7768-1 ADC driver"
+	depends on SPI
+	select IIO_BUFFER
+	select IIO_TRIGGER
+	select IIO_TRIGGERED_BUFFER
+	help
+	  Say yes here to build support for Analog Devices AD7768-1 SPI
+	  simultaneously sampling sigma-delta analog to digital converter (ADC).
+
+	  To compile this driver as a module, choose M here: the module will be
+	  called ad7768-1.
+
 config AD7791
 	tristate "Analog Devices AD7791 ADC driver"
 	depends on SPI
@@ -367,6 +410,15 @@ config INA2XX_ADC
 	  Say yes here to build support for TI INA2xx family of Power Monitors.
 	  This driver is mutually exclusive with the HWMON version.
 
+config INGENIC_ADC
+	tristate "Ingenic JZ47xx SoCs ADC driver"
+	depends on MIPS || COMPILE_TEST
+	help
+	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC unit.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called ingenic_adc.
+
 config IMX7D_ADC
 	tristate "Freescale IMX7D ADC driver"
 	depends on ARCH_MXC || COMPILE_TEST
@@ -576,6 +628,16 @@ config NAU7802
 	  To compile this driver as a module, choose M here: the
 	  module will be called nau7802.
 
+config NPCM_ADC
+	tristate "Nuvoton NPCM ADC driver"
+	depends on ARCH_NPCM || COMPILE_TEST
+	depends on HAS_IOMEM
+	help
+	  Say yes here to build support for Nuvoton NPCM ADC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called npcm_adc.
+
 config PALMAS_GPADC
 	tristate "TI Palmas General Purpose ADC"
 	depends on MFD_PALMAS
@@ -908,6 +970,16 @@ config TI_ADS8688
 	  This driver can also be built as a module. If so, the module will be
 	  called ti-ads8688.
 
+config TI_ADS124S08
+	tristate "Texas Instruments ADS124S08"
+	depends on SPI && OF
+	help
+	  If you say yes here you get support for Texas Instruments ADS124S08
+	  and ADS124S06 ADC chips
+
+	  This driver can also be built as a module. If so, the module will be
+	  called ti-ads124s08.
+
 config TI_AM335X_ADC
 	tristate "TI's AM335X ADC driver"
 	depends on MFD_TI_AM335X_TSCADC && HAS_DMA
diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
index 07df37f621bd..d50eb47da484 100644
--- a/drivers/iio/adc/Makefile
+++ b/drivers/iio/adc/Makefile
@@ -11,7 +11,11 @@ obj-$(CONFIG_AD7291) += ad7291.o
 obj-$(CONFIG_AD7298) += ad7298.o
 obj-$(CONFIG_AD7923) += ad7923.o
 obj-$(CONFIG_AD7476) += ad7476.o
+obj-$(CONFIG_AD7606_IFACE_PARALLEL) += ad7606_par.o
+obj-$(CONFIG_AD7606_IFACE_SPI) += ad7606_spi.o
+obj-$(CONFIG_AD7606) += ad7606.o
 obj-$(CONFIG_AD7766) += ad7766.o
+obj-$(CONFIG_AD7768_1) += ad7768-1.o
 obj-$(CONFIG_AD7791) += ad7791.o
 obj-$(CONFIG_AD7793) += ad7793.o
 obj-$(CONFIG_AD7887) += ad7887.o
@@ -36,6 +40,7 @@ obj-$(CONFIG_HI8435) += hi8435.o
 obj-$(CONFIG_HX711) += hx711.o
 obj-$(CONFIG_IMX7D_ADC) += imx7d_adc.o
 obj-$(CONFIG_INA2XX_ADC) += ina2xx-adc.o
+obj-$(CONFIG_INGENIC_ADC) += ingenic-adc.o
 obj-$(CONFIG_LP8788_ADC) += lp8788_adc.o
 obj-$(CONFIG_LPC18XX_ADC) += lpc18xx_adc.o
 obj-$(CONFIG_LPC32XX_ADC) += lpc32xx_adc.o
@@ -55,6 +60,7 @@ obj-$(CONFIG_MEN_Z188_ADC) += men_z188_adc.o
 obj-$(CONFIG_MESON_SARADC) += meson_saradc.o
 obj-$(CONFIG_MXS_LRADC_ADC) += mxs-lradc-adc.o
 obj-$(CONFIG_NAU7802) += nau7802.o
+obj-$(CONFIG_NPCM_ADC) += npcm_adc.o
 obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
 obj-$(CONFIG_QCOM_SPMI_ADC5) += qcom-spmi-adc5.o
 obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
@@ -81,6 +87,7 @@ obj-$(CONFIG_TI_ADC161S626) += ti-adc161s626.o
 obj-$(CONFIG_TI_ADS1015) += ti-ads1015.o
 obj-$(CONFIG_TI_ADS7950) += ti-ads7950.o
 obj-$(CONFIG_TI_ADS8688) += ti-ads8688.o
+obj-$(CONFIG_TI_ADS124S08) += ti-ads124s08.o
 obj-$(CONFIG_TI_AM335X_ADC) += ti_am335x_adc.o
 obj-$(CONFIG_TI_TLC4541) += ti-tlc4541.o
 obj-$(CONFIG_TWL4030_MADC) += twl4030-madc.o
diff --git a/drivers/iio/adc/ad7476.c b/drivers/iio/adc/ad7476.c
index 0549686b9ef8..76747488044b 100644
--- a/drivers/iio/adc/ad7476.c
+++ b/drivers/iio/adc/ad7476.c
@@ -59,6 +59,9 @@ enum ad7476_supported_device_ids {
 	ID_ADC081S,
 	ID_ADC101S,
 	ID_ADC121S,
+	ID_ADS7866,
+	ID_ADS7867,
+	ID_ADS7868,
 };
 
 static irqreturn_t ad7476_trigger_handler(int irq, void  *p)
@@ -157,6 +160,8 @@ static int ad7476_read_raw(struct iio_dev *indio_dev,
 #define AD7940_CHAN(bits) _AD7476_CHAN((bits), 15 - (bits), \
 		BIT(IIO_CHAN_INFO_RAW))
 #define AD7091R_CHAN(bits) _AD7476_CHAN((bits), 16 - (bits), 0)
+#define ADS786X_CHAN(bits) _AD7476_CHAN((bits), 12 - (bits), \
+		BIT(IIO_CHAN_INFO_RAW))
 
 static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
 	[ID_AD7091R] = {
@@ -209,6 +214,18 @@ static const struct ad7476_chip_info ad7476_chip_info_tbl[] = {
 		.channel[0] = ADC081S_CHAN(12),
 		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
 	},
+	[ID_ADS7866] = {
+		.channel[0] = ADS786X_CHAN(12),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADS7867] = {
+		.channel[0] = ADS786X_CHAN(10),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
+	[ID_ADS7868] = {
+		.channel[0] = ADS786X_CHAN(8),
+		.channel[1] = IIO_CHAN_SOFT_TIMESTAMP(1),
+	},
 };
 
 static const struct iio_info ad7476_info = {
@@ -314,6 +331,9 @@ static const struct spi_device_id ad7476_id[] = {
 	{"adc081s", ID_ADC081S},
 	{"adc101s", ID_ADC101S},
 	{"adc121s", ID_ADC121S},
+	{"ads7866", ID_ADS7866},
+	{"ads7867", ID_ADS7867},
+	{"ads7868", ID_ADS7868},
 	{}
 };
 MODULE_DEVICE_TABLE(spi, ad7476_id);
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
new file mode 100644
index 000000000000..ebb8de03bbce
--- /dev/null
+++ b/drivers/iio/adc/ad7606.c
@@ -0,0 +1,583 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AD7606 SPI ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+#include <linux/util_macros.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+#include "ad7606.h"
+
+/*
+ * Scales are computed as 5000/32768 and 10000/32768 respectively,
+ * so that when applied to the raw values they provide mV values
+ */
+static const unsigned int scale_avail[2] = {
+	152588, 305176
+};
+
+static const unsigned int ad7606_oversampling_avail[7] = {
+	1, 2, 4, 8, 16, 32, 64,
+};
+
+static int ad7606_reset(struct ad7606_state *st)
+{
+	if (st->gpio_reset) {
+		gpiod_set_value(st->gpio_reset, 1);
+		ndelay(100); /* t_reset >= 100ns */
+		gpiod_set_value(st->gpio_reset, 0);
+		return 0;
+	}
+
+	return -ENODEV;
+}
+
+static int ad7606_read_samples(struct ad7606_state *st)
+{
+	unsigned int num = st->chip_info->num_channels;
+	u16 *data = st->data;
+	int ret;
+
+	/*
+	 * The frstdata signal is set to high while and after reading the sample
+	 * of the first channel and low for all other channels. This can be used
+	 * to check that the incoming data is correctly aligned. During normal
+	 * operation the data should never become unaligned, but some glitch or
+	 * electrostatic discharge might cause an extra read or clock cycle.
+	 * Monitoring the frstdata signal allows to recover from such failure
+	 * situations.
+	 */
+
+	if (st->gpio_frstdata) {
+		ret = st->bops->read_block(st->dev, 1, data);
+		if (ret)
+			return ret;
+
+		if (!gpiod_get_value(st->gpio_frstdata)) {
+			ad7606_reset(st);
+			return -EIO;
+		}
+
+		data++;
+		num--;
+	}
+
+	return st->bops->read_block(st->dev, num, data);
+}
+
+static irqreturn_t ad7606_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ad7606_state *st = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&st->lock);
+
+	ret = ad7606_read_samples(st);
+	if (ret == 0)
+		iio_push_to_buffers_with_timestamp(indio_dev, st->data,
+						   iio_get_time_ns(indio_dev));
+
+	iio_trigger_notify_done(indio_dev->trig);
+	/* The rising edge of the CONVST signal starts a new conversion. */
+	gpiod_set_value(st->gpio_convst, 1);
+
+	mutex_unlock(&st->lock);
+
+	return IRQ_HANDLED;
+}
+
+static int ad7606_scan_direct(struct iio_dev *indio_dev, unsigned int ch)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+	int ret;
+
+	gpiod_set_value(st->gpio_convst, 1);
+	ret = wait_for_completion_timeout(&st->completion,
+					  msecs_to_jiffies(1000));
+	if (!ret) {
+		ret = -ETIMEDOUT;
+		goto error_ret;
+	}
+
+	ret = ad7606_read_samples(st);
+	if (ret == 0)
+		ret = st->data[ch];
+
+error_ret:
+	gpiod_set_value(st->gpio_convst, 0);
+
+	return ret;
+}
+
+static int ad7606_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val,
+			   int *val2,
+			   long m)
+{
+	int ret;
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		ret = ad7606_scan_direct(indio_dev, chan->address);
+		iio_device_release_direct_mode(indio_dev);
+
+		if (ret < 0)
+			return ret;
+		*val = (short)ret;
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		*val = 0;
+		*val2 = scale_avail[st->range];
+		return IIO_VAL_INT_PLUS_MICRO;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		*val = st->oversampling;
+		return IIO_VAL_INT;
+	}
+	return -EINVAL;
+}
+
+static ssize_t in_voltage_scale_available_show(struct device *dev,
+					       struct device_attribute *attr,
+					       char *buf)
+{
+	int i, len = 0;
+
+	for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
+		len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
+				 scale_avail[i]);
+
+	buf[len - 1] = '\n';
+
+	return len;
+}
+
+static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
+
+static int ad7606_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val,
+			    int val2,
+			    long mask)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+	DECLARE_BITMAP(values, 3);
+	int i;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SCALE:
+		mutex_lock(&st->lock);
+		i = find_closest(val2, scale_avail, ARRAY_SIZE(scale_avail));
+		gpiod_set_value(st->gpio_range, i);
+		st->range = i;
+		mutex_unlock(&st->lock);
+
+		return 0;
+	case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
+		if (val2)
+			return -EINVAL;
+		i = find_closest(val, ad7606_oversampling_avail,
+				 ARRAY_SIZE(ad7606_oversampling_avail));
+
+		values[0] = i;
+
+		mutex_lock(&st->lock);
+		gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
+				      st->gpio_os->info, values);
+		st->oversampling = ad7606_oversampling_avail[i];
+		mutex_unlock(&st->lock);
+
+		return 0;
+	default:
+		return -EINVAL;
+	}
+}
+
+static IIO_CONST_ATTR(oversampling_ratio_available, "1 2 4 8 16 32 64");
+
+static struct attribute *ad7606_attributes_os_and_range[] = {
+	&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
+	&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ad7606_attribute_group_os_and_range = {
+	.attrs = ad7606_attributes_os_and_range,
+};
+
+static struct attribute *ad7606_attributes_os[] = {
+	&iio_const_attr_oversampling_ratio_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ad7606_attribute_group_os = {
+	.attrs = ad7606_attributes_os,
+};
+
+static struct attribute *ad7606_attributes_range[] = {
+	&iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
+	NULL,
+};
+
+static const struct attribute_group ad7606_attribute_group_range = {
+	.attrs = ad7606_attributes_range,
+};
+
+#define AD760X_CHANNEL(num, mask) {				\
+		.type = IIO_VOLTAGE,				\
+		.indexed = 1,					\
+		.channel = num,					\
+		.address = num,					\
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
+		.info_mask_shared_by_all = mask,		\
+		.scan_index = num,				\
+		.scan_type = {					\
+			.sign = 's',				\
+			.realbits = 16,				\
+			.storagebits = 16,			\
+			.endianness = IIO_CPU,			\
+		},						\
+}
+
+#define AD7605_CHANNEL(num)	\
+	AD760X_CHANNEL(num, 0)
+
+#define AD7606_CHANNEL(num)	\
+	AD760X_CHANNEL(num, BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO))
+
+static const struct iio_chan_spec ad7605_channels[] = {
+	IIO_CHAN_SOFT_TIMESTAMP(4),
+	AD7605_CHANNEL(0),
+	AD7605_CHANNEL(1),
+	AD7605_CHANNEL(2),
+	AD7605_CHANNEL(3),
+};
+
+static const struct iio_chan_spec ad7606_channels[] = {
+	IIO_CHAN_SOFT_TIMESTAMP(8),
+	AD7606_CHANNEL(0),
+	AD7606_CHANNEL(1),
+	AD7606_CHANNEL(2),
+	AD7606_CHANNEL(3),
+	AD7606_CHANNEL(4),
+	AD7606_CHANNEL(5),
+	AD7606_CHANNEL(6),
+	AD7606_CHANNEL(7),
+};
+
+static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
+	/* More devices added in future */
+	[ID_AD7605_4] = {
+		.channels = ad7605_channels,
+		.num_channels = 5,
+	},
+	[ID_AD7606_8] = {
+		.channels = ad7606_channels,
+		.num_channels = 9,
+		.has_oversampling = true,
+	},
+	[ID_AD7606_6] = {
+		.channels = ad7606_channels,
+		.num_channels = 7,
+		.has_oversampling = true,
+	},
+	[ID_AD7606_4] = {
+		.channels = ad7606_channels,
+		.num_channels = 5,
+		.has_oversampling = true,
+	},
+};
+
+static int ad7606_request_gpios(struct ad7606_state *st)
+{
+	struct device *dev = st->dev;
+
+	st->gpio_convst = devm_gpiod_get(dev, "adi,conversion-start",
+					 GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_convst))
+		return PTR_ERR(st->gpio_convst);
+
+	st->gpio_reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_reset))
+		return PTR_ERR(st->gpio_reset);
+
+	st->gpio_range = devm_gpiod_get_optional(dev, "adi,range",
+						 GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_range))
+		return PTR_ERR(st->gpio_range);
+
+	st->gpio_standby = devm_gpiod_get_optional(dev, "standby",
+						   GPIOD_OUT_HIGH);
+	if (IS_ERR(st->gpio_standby))
+		return PTR_ERR(st->gpio_standby);
+
+	st->gpio_frstdata = devm_gpiod_get_optional(dev, "adi,first-data",
+						    GPIOD_IN);
+	if (IS_ERR(st->gpio_frstdata))
+		return PTR_ERR(st->gpio_frstdata);
+
+	if (!st->chip_info->has_oversampling)
+		return 0;
+
+	st->gpio_os = devm_gpiod_get_array_optional(dev,
+						    "adi,oversampling-ratio",
+						    GPIOD_OUT_LOW);
+	return PTR_ERR_OR_ZERO(st->gpio_os);
+}
+
+/*
+ * The BUSY signal indicates when conversions are in progress, so when a rising
+ * edge of CONVST is applied, BUSY goes logic high and transitions low at the
+ * end of the entire conversion process. The falling edge of the BUSY signal
+ * triggers this interrupt.
+ */
+static irqreturn_t ad7606_interrupt(int irq, void *dev_id)
+{
+	struct iio_dev *indio_dev = dev_id;
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	if (iio_buffer_enabled(indio_dev)) {
+		gpiod_set_value(st->gpio_convst, 0);
+		iio_trigger_poll_chained(st->trig);
+	} else {
+		complete(&st->completion);
+	}
+
+	return IRQ_HANDLED;
+};
+
+static int ad7606_validate_trigger(struct iio_dev *indio_dev,
+				   struct iio_trigger *trig)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	if (st->trig != trig)
+		return -EINVAL;
+
+	return 0;
+}
+
+static int ad7606_buffer_postenable(struct iio_dev *indio_dev)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	iio_triggered_buffer_postenable(indio_dev);
+	gpiod_set_value(st->gpio_convst, 1);
+
+	return 0;
+}
+
+static int ad7606_buffer_predisable(struct iio_dev *indio_dev)
+{
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	gpiod_set_value(st->gpio_convst, 0);
+
+	return iio_triggered_buffer_predisable(indio_dev);
+}
+
+static const struct iio_buffer_setup_ops ad7606_buffer_ops = {
+	.postenable = &ad7606_buffer_postenable,
+	.predisable = &ad7606_buffer_predisable,
+};
+
+static const struct iio_info ad7606_info_no_os_or_range = {
+	.read_raw = &ad7606_read_raw,
+	.validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_info ad7606_info_os_and_range = {
+	.read_raw = &ad7606_read_raw,
+	.write_raw = &ad7606_write_raw,
+	.attrs = &ad7606_attribute_group_os_and_range,
+	.validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_info ad7606_info_os = {
+	.read_raw = &ad7606_read_raw,
+	.write_raw = &ad7606_write_raw,
+	.attrs = &ad7606_attribute_group_os,
+	.validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_info ad7606_info_range = {
+	.read_raw = &ad7606_read_raw,
+	.write_raw = &ad7606_write_raw,
+	.attrs = &ad7606_attribute_group_range,
+	.validate_trigger = &ad7606_validate_trigger,
+};
+
+static const struct iio_trigger_ops ad7606_trigger_ops = {
+	.validate_device = iio_trigger_validate_own_device,
+};
+
+static void ad7606_regulator_disable(void *data)
+{
+	struct ad7606_state *st = data;
+
+	regulator_disable(st->reg);
+}
+
+int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
+		 const char *name, unsigned int id,
+		 const struct ad7606_bus_ops *bops)
+{
+	struct ad7606_state *st;
+	int ret;
+	struct iio_dev *indio_dev;
+
+	indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	dev_set_drvdata(dev, indio_dev);
+
+	st->dev = dev;
+	mutex_init(&st->lock);
+	st->bops = bops;
+	st->base_address = base_address;
+	/* tied to logic low, analog input range is +/- 5V */
+	st->range = 0;
+	st->oversampling = 1;
+
+	st->reg = devm_regulator_get(dev, "avcc");
+	if (IS_ERR(st->reg))
+		return PTR_ERR(st->reg);
+
+	ret = regulator_enable(st->reg);
+	if (ret) {
+		dev_err(dev, "Failed to enable specified AVcc supply\n");
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(dev, ad7606_regulator_disable, st);
+	if (ret)
+		return ret;
+
+	st->chip_info = &ad7606_chip_info_tbl[id];
+
+	ret = ad7606_request_gpios(st);
+	if (ret)
+		return ret;
+
+	indio_dev->dev.parent = dev;
+	if (st->gpio_os) {
+		if (st->gpio_range)
+			indio_dev->info = &ad7606_info_os_and_range;
+		else
+			indio_dev->info = &ad7606_info_os;
+	} else {
+		if (st->gpio_range)
+			indio_dev->info = &ad7606_info_range;
+		else
+			indio_dev->info = &ad7606_info_no_os_or_range;
+	}
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->name = name;
+	indio_dev->channels = st->chip_info->channels;
+	indio_dev->num_channels = st->chip_info->num_channels;
+
+	init_completion(&st->completion);
+
+	ret = ad7606_reset(st);
+	if (ret)
+		dev_warn(st->dev, "failed to RESET: no RESET GPIO specified\n");
+
+	st->trig = devm_iio_trigger_alloc(dev, "%s-dev%d",
+					  indio_dev->name, indio_dev->id);
+	if (!st->trig)
+		return -ENOMEM;
+
+	st->trig->ops = &ad7606_trigger_ops;
+	st->trig->dev.parent = dev;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
+	ret = devm_iio_trigger_register(dev, st->trig);
+	if (ret)
+		return ret;
+
+	indio_dev->trig = iio_trigger_get(st->trig);
+
+	ret = devm_request_threaded_irq(dev, irq,
+					NULL,
+					&ad7606_interrupt,
+					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+					name, indio_dev);
+	if (ret)
+		return ret;
+
+	ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
+					      &iio_pollfunc_store_time,
+					      &ad7606_trigger_handler,
+					      &ad7606_buffer_ops);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(dev, indio_dev);
+}
+EXPORT_SYMBOL_GPL(ad7606_probe);
+
+#ifdef CONFIG_PM_SLEEP
+
+static int ad7606_suspend(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	if (st->gpio_standby) {
+		gpiod_set_value(st->gpio_range, 1);
+		gpiod_set_value(st->gpio_standby, 0);
+	}
+
+	return 0;
+}
+
+static int ad7606_resume(struct device *dev)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	if (st->gpio_standby) {
+		gpiod_set_value(st->gpio_range, st->range);
+		gpiod_set_value(st->gpio_standby, 1);
+		ad7606_reset(st);
+	}
+
+	return 0;
+}
+
+SIMPLE_DEV_PM_OPS(ad7606_pm_ops, ad7606_suspend, ad7606_resume);
+EXPORT_SYMBOL_GPL(ad7606_pm_ops);
+
+#endif
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
new file mode 100644
index 000000000000..5d12410f68e1
--- /dev/null
+++ b/drivers/iio/adc/ad7606.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * AD7606 ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#ifndef IIO_ADC_AD7606_H_
+#define IIO_ADC_AD7606_H_
+
+/**
+ * struct ad7606_chip_info - chip specific information
+ * @channels:		channel specification
+ * @num_channels:	number of channels
+ * @has_oversampling:   whether the device has oversampling support
+ */
+struct ad7606_chip_info {
+	const struct iio_chan_spec	*channels;
+	unsigned int			num_channels;
+	bool				has_oversampling;
+};
+
+/**
+ * struct ad7606_state - driver instance specific data
+ * @dev		pointer to kernel device
+ * @chip_info		entry in the table of chips that describes this device
+ * @reg		regulator info for the the power supply of the device
+ * @bops		bus operations (SPI or parallel)
+ * @range		voltage range selection, selects which scale to apply
+ * @oversampling	oversampling selection
+ * @base_address	address from where to read data in parallel operation
+ * @lock		protect sensor state from concurrent accesses to GPIOs
+ * @gpio_convst	GPIO descriptor for conversion start signal (CONVST)
+ * @gpio_reset		GPIO descriptor for device hard-reset
+ * @gpio_range		GPIO descriptor for range selection
+ * @gpio_standby	GPIO descriptor for stand-by signal (STBY),
+ *			controls power-down mode of device
+ * @gpio_frstdata	GPIO descriptor for reading from device when data
+ *			is being read on the first channel
+ * @gpio_os		GPIO descriptors to control oversampling on the device
+ * @complete		completion to indicate end of conversion
+ * @trig		The IIO trigger associated with the device.
+ * @data		buffer for reading data from the device
+ */
+struct ad7606_state {
+	struct device			*dev;
+	const struct ad7606_chip_info	*chip_info;
+	struct regulator		*reg;
+	const struct ad7606_bus_ops	*bops;
+	unsigned int			range;
+	unsigned int			oversampling;
+	void __iomem			*base_address;
+
+	struct mutex			lock; /* protect sensor state */
+	struct gpio_desc		*gpio_convst;
+	struct gpio_desc		*gpio_reset;
+	struct gpio_desc		*gpio_range;
+	struct gpio_desc		*gpio_standby;
+	struct gpio_desc		*gpio_frstdata;
+	struct gpio_descs		*gpio_os;
+	struct iio_trigger		*trig;
+	struct completion		completion;
+
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 * 8 * 16-bit samples + 64-bit timestamp
+	 */
+	unsigned short			data[12] ____cacheline_aligned;
+};
+
+/**
+ * struct ad7606_bus_ops - driver bus operations
+ * @read_block		function pointer for reading blocks of data
+ */
+struct ad7606_bus_ops {
+	/* more methods added in future? */
+	int (*read_block)(struct device *dev, int num, void *data);
+};
+
+int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
+		 const char *name, unsigned int id,
+		 const struct ad7606_bus_ops *bops);
+
+enum ad7606_supported_device_ids {
+	ID_AD7605_4,
+	ID_AD7606_8,
+	ID_AD7606_6,
+	ID_AD7606_4
+};
+
+#ifdef CONFIG_PM_SLEEP
+extern const struct dev_pm_ops ad7606_pm_ops;
+#define AD7606_PM_OPS (&ad7606_pm_ops)
+#else
+#define AD7606_PM_OPS NULL
+#endif
+
+#endif /* IIO_ADC_AD7606_H_ */
diff --git a/drivers/iio/adc/ad7606_par.c b/drivers/iio/adc/ad7606_par.c
new file mode 100644
index 000000000000..1b08028facde
--- /dev/null
+++ b/drivers/iio/adc/ad7606_par.c
@@ -0,0 +1,105 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AD7606 Parallel Interface ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include <linux/err.h>
+#include <linux/io.h>
+
+#include <linux/iio/iio.h>
+#include "ad7606.h"
+
+static int ad7606_par16_read_block(struct device *dev,
+				   int count, void *buf)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	insw((unsigned long)st->base_address, buf, count);
+
+	return 0;
+}
+
+static const struct ad7606_bus_ops ad7606_par16_bops = {
+	.read_block = ad7606_par16_read_block,
+};
+
+static int ad7606_par8_read_block(struct device *dev,
+				  int count, void *buf)
+{
+	struct iio_dev *indio_dev = dev_get_drvdata(dev);
+	struct ad7606_state *st = iio_priv(indio_dev);
+
+	insb((unsigned long)st->base_address, buf, count * 2);
+
+	return 0;
+}
+
+static const struct ad7606_bus_ops ad7606_par8_bops = {
+	.read_block = ad7606_par8_read_block,
+};
+
+static int ad7606_par_probe(struct platform_device *pdev)
+{
+	const struct platform_device_id *id = platform_get_device_id(pdev);
+	struct resource *res;
+	void __iomem *addr;
+	resource_size_t remap_size;
+	int irq;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(&pdev->dev, "no irq: %d\n", irq);
+		return irq;
+	}
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	addr = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(addr))
+		return PTR_ERR(addr);
+
+	remap_size = resource_size(res);
+
+	return ad7606_probe(&pdev->dev, irq, addr,
+			    id->name, id->driver_data,
+			    remap_size > 1 ? &ad7606_par16_bops :
+			    &ad7606_par8_bops);
+}
+
+static const struct platform_device_id ad7606_driver_ids[] = {
+	{ .name	= "ad7605-4", .driver_data = ID_AD7605_4, },
+	{ .name	= "ad7606-4", .driver_data = ID_AD7606_4, },
+	{ .name	= "ad7606-6", .driver_data = ID_AD7606_6, },
+	{ .name	= "ad7606-8", .driver_data = ID_AD7606_8, },
+	{ }
+};
+MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
+
+static const struct of_device_id ad7606_of_match[] = {
+	{ .compatible = "adi,ad7605-4" },
+	{ .compatible = "adi,ad7606-4" },
+	{ .compatible = "adi,ad7606-6" },
+	{ .compatible = "adi,ad7606-8" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ad7606_of_match);
+
+static struct platform_driver ad7606_driver = {
+	.probe = ad7606_par_probe,
+	.id_table = ad7606_driver_ids,
+	.driver = {
+		.name = "ad7606",
+		.pm = AD7606_PM_OPS,
+		.of_match_table = ad7606_of_match,
+	},
+};
+module_platform_driver(ad7606_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ad7606_spi.c b/drivers/iio/adc/ad7606_spi.c
new file mode 100644
index 000000000000..4fd0ec36a086
--- /dev/null
+++ b/drivers/iio/adc/ad7606_spi.c
@@ -0,0 +1,82 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * AD7606 SPI ADC driver
+ *
+ * Copyright 2011 Analog Devices Inc.
+ */
+
+#include <linux/module.h>
+#include <linux/spi/spi.h>
+#include <linux/types.h>
+#include <linux/err.h>
+
+#include <linux/iio/iio.h>
+#include "ad7606.h"
+
+#define MAX_SPI_FREQ_HZ		23500000	/* VDRIVE above 4.75 V */
+
+static int ad7606_spi_read_block(struct device *dev,
+				 int count, void *buf)
+{
+	struct spi_device *spi = to_spi_device(dev);
+	int i, ret;
+	unsigned short *data = buf;
+	__be16 *bdata = buf;
+
+	ret = spi_read(spi, buf, count * 2);
+	if (ret < 0) {
+		dev_err(&spi->dev, "SPI read error\n");
+		return ret;
+	}
+
+	for (i = 0; i < count; i++)
+		data[i] = be16_to_cpu(bdata[i]);
+
+	return 0;
+}
+
+static const struct ad7606_bus_ops ad7606_spi_bops = {
+	.read_block = ad7606_spi_read_block,
+};
+
+static int ad7606_spi_probe(struct spi_device *spi)
+{
+	const struct spi_device_id *id = spi_get_device_id(spi);
+
+	return ad7606_probe(&spi->dev, spi->irq, NULL,
+			    id->name, id->driver_data,
+			    &ad7606_spi_bops);
+}
+
+static const struct spi_device_id ad7606_id_table[] = {
+	{ "ad7605-4", ID_AD7605_4 },
+	{ "ad7606-4", ID_AD7606_4 },
+	{ "ad7606-6", ID_AD7606_6 },
+	{ "ad7606-8", ID_AD7606_8 },
+	{}
+};
+MODULE_DEVICE_TABLE(spi, ad7606_id_table);
+
+static const struct of_device_id ad7606_of_match[] = {
+	{ .compatible = "adi,ad7605-4" },
+	{ .compatible = "adi,ad7606-4" },
+	{ .compatible = "adi,ad7606-6" },
+	{ .compatible = "adi,ad7606-8" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ad7606_of_match);
+
+static struct spi_driver ad7606_driver = {
+	.driver = {
+		.name = "ad7606",
+		.of_match_table = ad7606_of_match,
+		.pm = AD7606_PM_OPS,
+	},
+	.probe = ad7606_spi_probe,
+	.id_table = ad7606_id_table,
+};
+module_spi_driver(ad7606_driver);
+
+MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c
new file mode 100644
index 000000000000..0d132708c429
--- /dev/null
+++ b/drivers/iio/adc/ad7768-1.c
@@ -0,0 +1,655 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Analog Devices AD7768-1 SPI ADC driver
+ *
+ * Copyright 2017 Analog Devices Inc.
+ */
+#include <linux/bitfield.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regulator/consumer.h>
+#include <linux/sysfs.h>
+#include <linux/spi/spi.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/trigger_consumer.h>
+
+/* AD7768 registers definition */
+#define AD7768_REG_CHIP_TYPE		0x3
+#define AD7768_REG_PROD_ID_L		0x4
+#define AD7768_REG_PROD_ID_H		0x5
+#define AD7768_REG_CHIP_GRADE		0x6
+#define AD7768_REG_SCRATCH_PAD		0x0A
+#define AD7768_REG_VENDOR_L		0x0C
+#define AD7768_REG_VENDOR_H		0x0D
+#define AD7768_REG_INTERFACE_FORMAT	0x14
+#define AD7768_REG_POWER_CLOCK		0x15
+#define AD7768_REG_ANALOG		0x16
+#define AD7768_REG_ANALOG2		0x17
+#define AD7768_REG_CONVERSION		0x18
+#define AD7768_REG_DIGITAL_FILTER	0x19
+#define AD7768_REG_SINC3_DEC_RATE_MSB	0x1A
+#define AD7768_REG_SINC3_DEC_RATE_LSB	0x1B
+#define AD7768_REG_DUTY_CYCLE_RATIO	0x1C
+#define AD7768_REG_SYNC_RESET		0x1D
+#define AD7768_REG_GPIO_CONTROL		0x1E
+#define AD7768_REG_GPIO_WRITE		0x1F
+#define AD7768_REG_GPIO_READ		0x20
+#define AD7768_REG_OFFSET_HI		0x21
+#define AD7768_REG_OFFSET_MID		0x22
+#define AD7768_REG_OFFSET_LO		0x23
+#define AD7768_REG_GAIN_HI		0x24
+#define AD7768_REG_GAIN_MID		0x25
+#define AD7768_REG_GAIN_LO		0x26
+#define AD7768_REG_SPI_DIAG_ENABLE	0x28
+#define AD7768_REG_ADC_DIAG_ENABLE	0x29
+#define AD7768_REG_DIG_DIAG_ENABLE	0x2A
+#define AD7768_REG_ADC_DATA		0x2C
+#define AD7768_REG_MASTER_STATUS	0x2D
+#define AD7768_REG_SPI_DIAG_STATUS	0x2E
+#define AD7768_REG_ADC_DIAG_STATUS	0x2F
+#define AD7768_REG_DIG_DIAG_STATUS	0x30
+#define AD7768_REG_MCLK_COUNTER		0x31
+
+/* AD7768_REG_POWER_CLOCK */
+#define AD7768_PWR_MCLK_DIV_MSK		GENMASK(5, 4)
+#define AD7768_PWR_MCLK_DIV(x)		FIELD_PREP(AD7768_PWR_MCLK_DIV_MSK, x)
+#define AD7768_PWR_PWRMODE_MSK		GENMASK(1, 0)
+#define AD7768_PWR_PWRMODE(x)		FIELD_PREP(AD7768_PWR_PWRMODE_MSK, x)
+
+/* AD7768_REG_DIGITAL_FILTER */
+#define AD7768_DIG_FIL_FIL_MSK		GENMASK(6, 4)
+#define AD7768_DIG_FIL_FIL(x)		FIELD_PREP(AD7768_DIG_FIL_FIL_MSK, x)
+#define AD7768_DIG_FIL_DEC_MSK		GENMASK(2, 0)
+#define AD7768_DIG_FIL_DEC_RATE(x)	FIELD_PREP(AD7768_DIG_FIL_DEC_MSK, x)
+
+/* AD7768_REG_CONVERSION */
+#define AD7768_CONV_MODE_MSK		GENMASK(2, 0)
+#define AD7768_CONV_MODE(x)		FIELD_PREP(AD7768_CONV_MODE_MSK, x)
+
+#define AD7768_RD_FLAG_MSK(x)		(BIT(6) | ((x) & 0x3F))
+#define AD7768_WR_FLAG_MSK(x)		((x) & 0x3F)
+
+enum ad7768_conv_mode {
+	AD7768_CONTINUOUS,
+	AD7768_ONE_SHOT,
+	AD7768_SINGLE,
+	AD7768_PERIODIC,
+	AD7768_STANDBY
+};
+
+enum ad7768_pwrmode {
+	AD7768_ECO_MODE = 0,
+	AD7768_MED_MODE = 2,
+	AD7768_FAST_MODE = 3
+};
+
+enum ad7768_mclk_div {
+	AD7768_MCLK_DIV_16,
+	AD7768_MCLK_DIV_8,
+	AD7768_MCLK_DIV_4,
+	AD7768_MCLK_DIV_2
+};
+
+enum ad7768_dec_rate {
+	AD7768_DEC_RATE_32 = 0,
+	AD7768_DEC_RATE_64 = 1,
+	AD7768_DEC_RATE_128 = 2,
+	AD7768_DEC_RATE_256 = 3,
+	AD7768_DEC_RATE_512 = 4,
+	AD7768_DEC_RATE_1024 = 5,
+	AD7768_DEC_RATE_8 = 9,
+	AD7768_DEC_RATE_16 = 10
+};
+
+struct ad7768_clk_configuration {
+	enum ad7768_mclk_div mclk_div;
+	enum ad7768_dec_rate dec_rate;
+	unsigned int clk_div;
+	enum ad7768_pwrmode pwrmode;
+};
+
+static const struct ad7768_clk_configuration ad7768_clk_config[] = {
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_8, 16,  AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_16, 32,  AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_32, 64, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_64, 128, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_2, AD7768_DEC_RATE_128, 256, AD7768_FAST_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_128, 512, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_256, 1024, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_512, 2048, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_4, AD7768_DEC_RATE_1024, 4096, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_8, AD7768_DEC_RATE_1024, 8192, AD7768_MED_MODE },
+	{ AD7768_MCLK_DIV_16, AD7768_DEC_RATE_1024, 16384, AD7768_ECO_MODE },
+};
+
+static const struct iio_chan_spec ad7768_channels[] = {
+	{
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+		.indexed = 1,
+		.channel = 0,
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 24,
+			.storagebits = 32,
+			.shift = 8,
+			.endianness = IIO_BE,
+		},
+	},
+};
+
+struct ad7768_state {
+	struct spi_device *spi;
+	struct regulator *vref;
+	struct mutex lock;
+	struct clk *mclk;
+	unsigned int mclk_freq;
+	unsigned int samp_freq;
+	struct completion completion;
+	struct iio_trigger *trig;
+	struct gpio_desc *gpio_sync_in;
+	/*
+	 * DMA (thus cache coherency maintenance) requires the
+	 * transfer buffers to live in their own cache lines.
+	 */
+	union {
+		__be32 d32;
+		u8 d8[2];
+	} data ____cacheline_aligned;
+};
+
+static int ad7768_spi_reg_read(struct ad7768_state *st, unsigned int addr,
+			       unsigned int len)
+{
+	unsigned int shift;
+	int ret;
+
+	shift = 32 - (8 * len);
+	st->data.d8[0] = AD7768_RD_FLAG_MSK(addr);
+
+	ret = spi_write_then_read(st->spi, st->data.d8, 1,
+				  &st->data.d32, len);
+	if (ret < 0)
+		return ret;
+
+	return (be32_to_cpu(st->data.d32) >> shift);
+}
+
+static int ad7768_spi_reg_write(struct ad7768_state *st,
+				unsigned int addr,
+				unsigned int val)
+{
+	st->data.d8[0] = AD7768_WR_FLAG_MSK(addr);
+	st->data.d8[1] = val & 0xFF;
+
+	return spi_write(st->spi, st->data.d8, 2);
+}
+
+static int ad7768_set_mode(struct ad7768_state *st,
+			   enum ad7768_conv_mode mode)
+{
+	int regval;
+
+	regval = ad7768_spi_reg_read(st, AD7768_REG_CONVERSION, 1);
+	if (regval < 0)
+		return regval;
+
+	regval &= ~AD7768_CONV_MODE_MSK;
+	regval |= AD7768_CONV_MODE(mode);
+
+	return ad7768_spi_reg_write(st, AD7768_REG_CONVERSION, regval);
+}
+
+static int ad7768_scan_direct(struct iio_dev *indio_dev)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int readval, ret;
+
+	reinit_completion(&st->completion);
+
+	ret = ad7768_set_mode(st, AD7768_ONE_SHOT);
+	if (ret < 0)
+		return ret;
+
+	ret = wait_for_completion_timeout(&st->completion,
+					  msecs_to_jiffies(1000));
+	if (!ret)
+		return -ETIMEDOUT;
+
+	readval = ad7768_spi_reg_read(st, AD7768_REG_ADC_DATA, 3);
+	if (readval < 0)
+		return readval;
+	/*
+	 * Any SPI configuration of the AD7768-1 can only be
+	 * performed in continuous conversion mode.
+	 */
+	ret = ad7768_set_mode(st, AD7768_CONTINUOUS);
+	if (ret < 0)
+		return ret;
+
+	return readval;
+}
+
+static int ad7768_reg_access(struct iio_dev *indio_dev,
+			     unsigned int reg,
+			     unsigned int writeval,
+			     unsigned int *readval)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&st->lock);
+	if (readval) {
+		ret = ad7768_spi_reg_read(st, reg, 1);
+		if (ret < 0)
+			goto err_unlock;
+		*readval = ret;
+		ret = 0;
+	} else {
+		ret = ad7768_spi_reg_write(st, reg, writeval);
+	}
+err_unlock:
+	mutex_unlock(&st->lock);
+
+	return ret;
+}
+
+static int ad7768_set_dig_fil(struct ad7768_state *st,
+			      enum ad7768_dec_rate dec_rate)
+{
+	unsigned int mode;
+	int ret;
+
+	if (dec_rate == AD7768_DEC_RATE_8 || dec_rate == AD7768_DEC_RATE_16)
+		mode = AD7768_DIG_FIL_FIL(dec_rate);
+	else
+		mode = AD7768_DIG_FIL_DEC_RATE(dec_rate);
+
+	ret = ad7768_spi_reg_write(st, AD7768_REG_DIGITAL_FILTER, mode);
+	if (ret < 0)
+		return ret;
+
+	/* A sync-in pulse is required every time the filter dec rate changes */
+	gpiod_set_value(st->gpio_sync_in, 1);
+	gpiod_set_value(st->gpio_sync_in, 0);
+
+	return 0;
+}
+
+static int ad7768_set_freq(struct ad7768_state *st,
+			   unsigned int freq)
+{
+	unsigned int diff_new, diff_old, pwr_mode, i, idx;
+	int res, ret;
+
+	diff_old = U32_MAX;
+	idx = 0;
+
+	res = DIV_ROUND_CLOSEST(st->mclk_freq, freq);
+
+	/* Find the closest match for the desired sampling frequency */
+	for (i = 0; i < ARRAY_SIZE(ad7768_clk_config); i++) {
+		diff_new = abs(res - ad7768_clk_config[i].clk_div);
+		if (diff_new < diff_old) {
+			diff_old = diff_new;
+			idx = i;
+		}
+	}
+
+	/*
+	 * Set both the mclk_div and pwrmode with a single write to the
+	 * POWER_CLOCK register
+	 */
+	pwr_mode = AD7768_PWR_MCLK_DIV(ad7768_clk_config[idx].mclk_div) |
+		   AD7768_PWR_PWRMODE(ad7768_clk_config[idx].pwrmode);
+	ret = ad7768_spi_reg_write(st, AD7768_REG_POWER_CLOCK, pwr_mode);
+	if (ret < 0)
+		return ret;
+
+	ret =  ad7768_set_dig_fil(st, ad7768_clk_config[idx].dec_rate);
+	if (ret < 0)
+		return ret;
+
+	st->samp_freq = DIV_ROUND_CLOSEST(st->mclk_freq,
+					  ad7768_clk_config[idx].clk_div);
+
+	return 0;
+}
+
+static ssize_t ad7768_sampling_freq_avail(struct device *dev,
+					  struct device_attribute *attr,
+					  char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct ad7768_state *st = iio_priv(indio_dev);
+	unsigned int freq;
+	int i, len = 0;
+
+	for (i = 0; i < ARRAY_SIZE(ad7768_clk_config); i++) {
+		freq = DIV_ROUND_CLOSEST(st->mclk_freq,
+					 ad7768_clk_config[i].clk_div);
+		len += scnprintf(buf + len, PAGE_SIZE - len, "%d ", freq);
+	}
+
+	buf[len - 1] = '\n';
+
+	return len;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(ad7768_sampling_freq_avail);
+
+static int ad7768_read_raw(struct iio_dev *indio_dev,
+			   struct iio_chan_spec const *chan,
+			   int *val, int *val2, long info)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int scale_uv, ret;
+
+	switch (info) {
+	case IIO_CHAN_INFO_RAW:
+		ret = iio_device_claim_direct_mode(indio_dev);
+		if (ret)
+			return ret;
+
+		ret = ad7768_scan_direct(indio_dev);
+		if (ret >= 0)
+			*val = ret;
+
+		iio_device_release_direct_mode(indio_dev);
+		if (ret < 0)
+			return ret;
+
+		return IIO_VAL_INT;
+
+	case IIO_CHAN_INFO_SCALE:
+		scale_uv = regulator_get_voltage(st->vref);
+		if (scale_uv < 0)
+			return scale_uv;
+
+		*val = (scale_uv * 2) / 1000;
+		*val2 = chan->scan_type.realbits;
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = st->samp_freq;
+
+		return IIO_VAL_INT;
+	}
+
+	return -EINVAL;
+}
+
+static int ad7768_write_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int val, int val2, long info)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	switch (info) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		return ad7768_set_freq(st, val);
+	default:
+		return -EINVAL;
+	}
+}
+
+static struct attribute *ad7768_attributes[] = {
+	&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+	NULL
+};
+
+static const struct attribute_group ad7768_group = {
+	.attrs = ad7768_attributes,
+};
+
+static const struct iio_info ad7768_info = {
+	.attrs = &ad7768_group,
+	.read_raw = &ad7768_read_raw,
+	.write_raw = &ad7768_write_raw,
+	.debugfs_reg_access = &ad7768_reg_access,
+};
+
+static int ad7768_setup(struct ad7768_state *st)
+{
+	int ret;
+
+	/*
+	 * Two writes to the SPI_RESET[1:0] bits are required to initiate
+	 * a software reset. The bits must first be set to 11, and then
+	 * to 10. When the sequence is detected, the reset occurs.
+	 * See the datasheet, page 70.
+	 */
+	ret = ad7768_spi_reg_write(st, AD7768_REG_SYNC_RESET, 0x3);
+	if (ret)
+		return ret;
+
+	ret = ad7768_spi_reg_write(st, AD7768_REG_SYNC_RESET, 0x2);
+	if (ret)
+		return ret;
+
+	st->gpio_sync_in = devm_gpiod_get(&st->spi->dev, "adi,sync-in",
+					  GPIOD_OUT_LOW);
+	if (IS_ERR(st->gpio_sync_in))
+		return PTR_ERR(st->gpio_sync_in);
+
+	/* Set the default sampling frequency to 32000 kSPS */
+	return ad7768_set_freq(st, 32000);
+}
+
+static irqreturn_t ad7768_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&st->lock);
+
+	ret = spi_read(st->spi, &st->data.d32, 3);
+	if (ret < 0)
+		goto err_unlock;
+
+	iio_push_to_buffers_with_timestamp(indio_dev, &st->data.d32,
+					   iio_get_time_ns(indio_dev));
+
+	iio_trigger_notify_done(indio_dev->trig);
+err_unlock:
+	mutex_unlock(&st->lock);
+
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t ad7768_interrupt(int irq, void *dev_id)
+{
+	struct iio_dev *indio_dev = dev_id;
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	if (iio_buffer_enabled(indio_dev))
+		iio_trigger_poll(st->trig);
+	else
+		complete(&st->completion);
+
+	return IRQ_HANDLED;
+};
+
+static int ad7768_buffer_postenable(struct iio_dev *indio_dev)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+
+	iio_triggered_buffer_postenable(indio_dev);
+	/*
+	 * Write a 1 to the LSB of the INTERFACE_FORMAT register to enter
+	 * continuous read mode. Subsequent data reads do not require an
+	 * initial 8-bit write to query the ADC_DATA register.
+	 */
+	return ad7768_spi_reg_write(st, AD7768_REG_INTERFACE_FORMAT, 0x01);
+}
+
+static int ad7768_buffer_predisable(struct iio_dev *indio_dev)
+{
+	struct ad7768_state *st = iio_priv(indio_dev);
+	int ret;
+
+	/*
+	 * To exit continuous read mode, perform a single read of the ADC_DATA
+	 * reg (0x2C), which allows further configuration of the device.
+	 */
+	ret = ad7768_spi_reg_read(st, AD7768_REG_ADC_DATA, 3);
+	if (ret < 0)
+		return ret;
+
+	return iio_triggered_buffer_predisable(indio_dev);
+}
+
+static const struct iio_buffer_setup_ops ad7768_buffer_ops = {
+	.postenable = &ad7768_buffer_postenable,
+	.predisable = &ad7768_buffer_predisable,
+};
+
+static const struct iio_trigger_ops ad7768_trigger_ops = {
+	.validate_device = iio_trigger_validate_own_device,
+};
+
+static void ad7768_regulator_disable(void *data)
+{
+	struct ad7768_state *st = data;
+
+	regulator_disable(st->vref);
+}
+
+static void ad7768_clk_disable(void *data)
+{
+	struct ad7768_state *st = data;
+
+	clk_disable_unprepare(st->mclk);
+}
+
+static int ad7768_probe(struct spi_device *spi)
+{
+	struct ad7768_state *st;
+	struct iio_dev *indio_dev;
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	st = iio_priv(indio_dev);
+	st->spi = spi;
+
+	st->vref = devm_regulator_get(&spi->dev, "vref");
+	if (IS_ERR(st->vref))
+		return PTR_ERR(st->vref);
+
+	ret = regulator_enable(st->vref);
+	if (ret) {
+		dev_err(&spi->dev, "Failed to enable specified vref supply\n");
+		return ret;
+	}
+
+	ret = devm_add_action_or_reset(&spi->dev, ad7768_regulator_disable, st);
+	if (ret)
+		return ret;
+
+	st->mclk = devm_clk_get(&spi->dev, "mclk");
+	if (IS_ERR(st->mclk))
+		return PTR_ERR(st->mclk);
+
+	ret = clk_prepare_enable(st->mclk);
+	if (ret < 0)
+		return ret;
+
+	ret = devm_add_action_or_reset(&spi->dev, ad7768_clk_disable, st);
+	if (ret)
+		return ret;
+
+	st->mclk_freq = clk_get_rate(st->mclk);
+
+	spi_set_drvdata(spi, indio_dev);
+	mutex_init(&st->lock);
+
+	indio_dev->channels = ad7768_channels;
+	indio_dev->num_channels = ARRAY_SIZE(ad7768_channels);
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->name = spi_get_device_id(spi)->name;
+	indio_dev->info = &ad7768_info;
+	indio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_TRIGGERED;
+
+	ret = ad7768_setup(st);
+	if (ret < 0) {
+		dev_err(&spi->dev, "AD7768 setup failed\n");
+		return ret;
+	}
+
+	st->trig = devm_iio_trigger_alloc(&spi->dev, "%s-dev%d",
+					  indio_dev->name, indio_dev->id);
+	if (!st->trig)
+		return -ENOMEM;
+
+	st->trig->ops = &ad7768_trigger_ops;
+	st->trig->dev.parent = &spi->dev;
+	iio_trigger_set_drvdata(st->trig, indio_dev);
+	ret = devm_iio_trigger_register(&spi->dev, st->trig);
+	if (ret)
+		return ret;
+
+	indio_dev->trig = iio_trigger_get(st->trig);
+
+	init_completion(&st->completion);
+
+	ret = devm_request_irq(&spi->dev, spi->irq,
+			       &ad7768_interrupt,
+			       IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+			       indio_dev->name, indio_dev);
+	if (ret)
+		return ret;
+
+	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev,
+					      &iio_pollfunc_store_time,
+					      &ad7768_trigger_handler,
+					      &ad7768_buffer_ops);
+	if (ret)
+		return ret;
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct spi_device_id ad7768_id_table[] = {
+	{ "ad7768-1", 0 },
+	{}
+};
+MODULE_DEVICE_TABLE(spi, ad7768_id_table);
+
+static const struct of_device_id ad7768_of_match[] = {
+	{ .compatible = "adi,ad7768-1" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ad7768_of_match);
+
+static struct spi_driver ad7768_driver = {
+	.driver = {
+		.name = "ad7768-1",
+		.of_match_table = ad7768_of_match,
+	},
+	.probe = ad7768_probe,
+	.id_table = ad7768_id_table,
+};
+module_spi_driver(ad7768_driver);
+
+MODULE_AUTHOR("Stefan Popa <stefan.popa@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7768-1 ADC driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/exynos_adc.c b/drivers/iio/adc/exynos_adc.c
index fa2d2b5767f3..1ca2c4d39f87 100644
--- a/drivers/iio/adc/exynos_adc.c
+++ b/drivers/iio/adc/exynos_adc.c
@@ -115,6 +115,7 @@
 #define MAX_ADC_V2_CHANNELS		10
 #define MAX_ADC_V1_CHANNELS		8
 #define MAX_EXYNOS3250_ADC_CHANNELS	2
+#define MAX_EXYNOS4212_ADC_CHANNELS	4
 #define MAX_S5PV210_ADC_CHANNELS	10
 
 /* Bit definitions common for ADC_V1 and ADC_V2 */
@@ -271,6 +272,19 @@ static void exynos_adc_v1_start_conv(struct exynos_adc *info,
 	writel(con1 | ADC_CON_EN_START, ADC_V1_CON(info->regs));
 }
 
+/* Exynos4212 and 4412 is like ADCv1 but with four channels only */
+static const struct exynos_adc_data exynos4212_adc_data = {
+	.num_channels	= MAX_EXYNOS4212_ADC_CHANNELS,
+	.mask		= ADC_DATX_MASK,	/* 12 bit ADC resolution */
+	.needs_adc_phy	= true,
+	.phy_offset	= EXYNOS_ADCV1_PHY_OFFSET,
+
+	.init_hw	= exynos_adc_v1_init_hw,
+	.exit_hw	= exynos_adc_v1_exit_hw,
+	.clear_irq	= exynos_adc_v1_clear_irq,
+	.start_conv	= exynos_adc_v1_start_conv,
+};
+
 static const struct exynos_adc_data exynos_adc_v1_data = {
 	.num_channels	= MAX_ADC_V1_CHANNELS,
 	.mask		= ADC_DATX_MASK,	/* 12 bit ADC resolution */
@@ -493,6 +507,9 @@ static const struct of_device_id exynos_adc_match[] = {
 		.compatible = "samsung,s5pv210-adc",
 		.data = &exynos_adc_s5pv210_data,
 	}, {
+		.compatible = "samsung,exynos4212-adc",
+		.data = &exynos4212_adc_data,
+	}, {
 		.compatible = "samsung,exynos-adc-v1",
 		.data = &exynos_adc_v1_data,
 	}, {
@@ -929,7 +946,7 @@ static int exynos_adc_remove(struct platform_device *pdev)
 	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 	struct exynos_adc *info = iio_priv(indio_dev);
 
-	if (IS_REACHABLE(CONFIG_INPUT)) {
+	if (IS_REACHABLE(CONFIG_INPUT) && info->input) {
 		free_irq(info->tsirq, info);
 		input_unregister_device(info->input);
 	}
diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
new file mode 100644
index 000000000000..6ee1673deb0d
--- /dev/null
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -0,0 +1,364 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * ADC driver for the Ingenic JZ47xx SoCs
+ * Copyright (c) 2019 Artur Rojek <contact@artur-rojek.eu>
+ *
+ * based on drivers/mfd/jz4740-adc.c
+ */
+
+#include <dt-bindings/iio/adc/ingenic,adc.h>
+#include <linux/clk.h>
+#include <linux/iio/iio.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+
+#define JZ_ADC_REG_ENABLE		0x00
+#define JZ_ADC_REG_CFG			0x04
+#define JZ_ADC_REG_CTRL			0x08
+#define JZ_ADC_REG_STATUS		0x0c
+#define JZ_ADC_REG_ADTCH		0x18
+#define JZ_ADC_REG_ADBDAT		0x1c
+#define JZ_ADC_REG_ADSDAT		0x20
+
+#define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
+
+#define JZ_ADC_AUX_VREF				3300
+#define JZ_ADC_AUX_VREF_BITS			12
+#define JZ_ADC_BATTERY_LOW_VREF			2500
+#define JZ_ADC_BATTERY_LOW_VREF_BITS		12
+#define JZ4725B_ADC_BATTERY_HIGH_VREF		7500
+#define JZ4725B_ADC_BATTERY_HIGH_VREF_BITS	10
+#define JZ4740_ADC_BATTERY_HIGH_VREF		(7500 * 0.986)
+#define JZ4740_ADC_BATTERY_HIGH_VREF_BITS	12
+
+struct ingenic_adc_soc_data {
+	unsigned int battery_high_vref;
+	unsigned int battery_high_vref_bits;
+	const int *battery_raw_avail;
+	size_t battery_raw_avail_size;
+	const int *battery_scale_avail;
+	size_t battery_scale_avail_size;
+};
+
+struct ingenic_adc {
+	void __iomem *base;
+	struct clk *clk;
+	struct mutex lock;
+	const struct ingenic_adc_soc_data *soc_data;
+	bool low_vref_mode;
+};
+
+static void ingenic_adc_set_config(struct ingenic_adc *adc,
+				   uint32_t mask,
+				   uint32_t val)
+{
+	uint32_t cfg;
+
+	clk_enable(adc->clk);
+	mutex_lock(&adc->lock);
+
+	cfg = readl(adc->base + JZ_ADC_REG_CFG) & ~mask;
+	cfg |= val;
+	writel(cfg, adc->base + JZ_ADC_REG_CFG);
+
+	mutex_unlock(&adc->lock);
+	clk_disable(adc->clk);
+}
+
+static void ingenic_adc_enable(struct ingenic_adc *adc,
+			       int engine,
+			       bool enabled)
+{
+	u8 val;
+
+	mutex_lock(&adc->lock);
+	val = readb(adc->base + JZ_ADC_REG_ENABLE);
+
+	if (enabled)
+		val |= BIT(engine);
+	else
+		val &= ~BIT(engine);
+
+	writeb(val, adc->base + JZ_ADC_REG_ENABLE);
+	mutex_unlock(&adc->lock);
+}
+
+static int ingenic_adc_capture(struct ingenic_adc *adc,
+			       int engine)
+{
+	u8 val;
+	int ret;
+
+	ingenic_adc_enable(adc, engine, true);
+	ret = readb_poll_timeout(adc->base + JZ_ADC_REG_ENABLE, val,
+				 !(val & BIT(engine)), 250, 1000);
+	if (ret)
+		ingenic_adc_enable(adc, engine, false);
+
+	return ret;
+}
+
+static int ingenic_adc_write_raw(struct iio_dev *iio_dev,
+				 struct iio_chan_spec const *chan,
+				 int val,
+				 int val2,
+				 long m)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+
+	switch (m) {
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->channel) {
+		case INGENIC_ADC_BATTERY:
+			if (val > JZ_ADC_BATTERY_LOW_VREF) {
+				ingenic_adc_set_config(adc,
+						       JZ_ADC_REG_CFG_BAT_MD,
+						       0);
+				adc->low_vref_mode = false;
+			} else {
+				ingenic_adc_set_config(adc,
+						       JZ_ADC_REG_CFG_BAT_MD,
+						       JZ_ADC_REG_CFG_BAT_MD);
+				adc->low_vref_mode = true;
+			}
+			return 0;
+		default:
+			return -EINVAL;
+		}
+	default:
+		return -EINVAL;
+	}
+}
+
+static const int jz4725b_adc_battery_raw_avail[] = {
+	0, 1, (1 << JZ_ADC_BATTERY_LOW_VREF_BITS) - 1,
+};
+
+static const int jz4725b_adc_battery_scale_avail[] = {
+	JZ4725B_ADC_BATTERY_HIGH_VREF, JZ4725B_ADC_BATTERY_HIGH_VREF_BITS,
+	JZ_ADC_BATTERY_LOW_VREF, JZ_ADC_BATTERY_LOW_VREF_BITS,
+};
+
+static const int jz4740_adc_battery_raw_avail[] = {
+	0, 1, (1 << JZ_ADC_BATTERY_LOW_VREF_BITS) - 1,
+};
+
+static const int jz4740_adc_battery_scale_avail[] = {
+	JZ4740_ADC_BATTERY_HIGH_VREF, JZ4740_ADC_BATTERY_HIGH_VREF_BITS,
+	JZ_ADC_BATTERY_LOW_VREF, JZ_ADC_BATTERY_LOW_VREF_BITS,
+};
+
+static const struct ingenic_adc_soc_data jz4725b_adc_soc_data = {
+	.battery_high_vref = JZ4725B_ADC_BATTERY_HIGH_VREF,
+	.battery_high_vref_bits = JZ4725B_ADC_BATTERY_HIGH_VREF_BITS,
+	.battery_raw_avail = jz4725b_adc_battery_raw_avail,
+	.battery_raw_avail_size = ARRAY_SIZE(jz4725b_adc_battery_raw_avail),
+	.battery_scale_avail = jz4725b_adc_battery_scale_avail,
+	.battery_scale_avail_size = ARRAY_SIZE(jz4725b_adc_battery_scale_avail),
+};
+
+static const struct ingenic_adc_soc_data jz4740_adc_soc_data = {
+	.battery_high_vref = JZ4740_ADC_BATTERY_HIGH_VREF,
+	.battery_high_vref_bits = JZ4740_ADC_BATTERY_HIGH_VREF_BITS,
+	.battery_raw_avail = jz4740_adc_battery_raw_avail,
+	.battery_raw_avail_size = ARRAY_SIZE(jz4740_adc_battery_raw_avail),
+	.battery_scale_avail = jz4740_adc_battery_scale_avail,
+	.battery_scale_avail_size = ARRAY_SIZE(jz4740_adc_battery_scale_avail),
+};
+
+static int ingenic_adc_read_avail(struct iio_dev *iio_dev,
+				  struct iio_chan_spec const *chan,
+				  const int **vals,
+				  int *type,
+				  int *length,
+				  long m)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		*type = IIO_VAL_INT;
+		*length = adc->soc_data->battery_raw_avail_size;
+		*vals = adc->soc_data->battery_raw_avail;
+		return IIO_AVAIL_RANGE;
+	case IIO_CHAN_INFO_SCALE:
+		*type = IIO_VAL_FRACTIONAL_LOG2;
+		*length = adc->soc_data->battery_scale_avail_size;
+		*vals = adc->soc_data->battery_scale_avail;
+		return IIO_AVAIL_LIST;
+	default:
+		return -EINVAL;
+	};
+}
+
+static int ingenic_adc_read_raw(struct iio_dev *iio_dev,
+				struct iio_chan_spec const *chan,
+				int *val,
+				int *val2,
+				long m)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+	int ret;
+
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		clk_enable(adc->clk);
+		ret = ingenic_adc_capture(adc, chan->channel);
+		if (ret) {
+			clk_disable(adc->clk);
+			return ret;
+		}
+
+		switch (chan->channel) {
+		case INGENIC_ADC_AUX:
+			*val = readw(adc->base + JZ_ADC_REG_ADSDAT);
+			break;
+		case INGENIC_ADC_BATTERY:
+			*val = readw(adc->base + JZ_ADC_REG_ADBDAT);
+			break;
+		}
+
+		clk_disable(adc->clk);
+
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		switch (chan->channel) {
+		case INGENIC_ADC_AUX:
+			*val = JZ_ADC_AUX_VREF;
+			*val2 = JZ_ADC_AUX_VREF_BITS;
+			break;
+		case INGENIC_ADC_BATTERY:
+			if (adc->low_vref_mode) {
+				*val = JZ_ADC_BATTERY_LOW_VREF;
+				*val2 = JZ_ADC_BATTERY_LOW_VREF_BITS;
+			} else {
+				*val = adc->soc_data->battery_high_vref;
+				*val2 = adc->soc_data->battery_high_vref_bits;
+			}
+			break;
+		}
+
+		return IIO_VAL_FRACTIONAL_LOG2;
+	default:
+		return -EINVAL;
+	}
+}
+
+static void ingenic_adc_clk_cleanup(void *data)
+{
+	clk_unprepare(data);
+}
+
+static const struct iio_info ingenic_adc_info = {
+	.write_raw = ingenic_adc_write_raw,
+	.read_raw = ingenic_adc_read_raw,
+	.read_avail = ingenic_adc_read_avail,
+};
+
+static const struct iio_chan_spec ingenic_channels[] = {
+	{
+		.extend_name = "aux",
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.indexed = 1,
+		.channel = INGENIC_ADC_AUX,
+	},
+	{
+		.extend_name = "battery",
+		.type = IIO_VOLTAGE,
+		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+				      BIT(IIO_CHAN_INFO_SCALE),
+		.info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW) |
+						BIT(IIO_CHAN_INFO_SCALE),
+		.indexed = 1,
+		.channel = INGENIC_ADC_BATTERY,
+	},
+};
+
+static int ingenic_adc_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct iio_dev *iio_dev;
+	struct ingenic_adc *adc;
+	struct resource *mem_base;
+	const struct ingenic_adc_soc_data *soc_data;
+	int ret;
+
+	soc_data = device_get_match_data(dev);
+	if (!soc_data)
+		return -EINVAL;
+
+	iio_dev = devm_iio_device_alloc(dev, sizeof(*adc));
+	if (!iio_dev)
+		return -ENOMEM;
+
+	adc = iio_priv(iio_dev);
+	mutex_init(&adc->lock);
+	adc->soc_data = soc_data;
+
+	mem_base = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	adc->base = devm_ioremap_resource(dev, mem_base);
+	if (IS_ERR(adc->base)) {
+		dev_err(dev, "Unable to ioremap mmio resource\n");
+		return PTR_ERR(adc->base);
+	}
+
+	adc->clk = devm_clk_get(dev, "adc");
+	if (IS_ERR(adc->clk)) {
+		dev_err(dev, "Unable to get clock\n");
+		return PTR_ERR(adc->clk);
+	}
+
+	ret = clk_prepare_enable(adc->clk);
+	if (ret) {
+		dev_err(dev, "Failed to enable clock\n");
+		return ret;
+	}
+
+	/* Put hardware in a known passive state. */
+	writeb(0x00, adc->base + JZ_ADC_REG_ENABLE);
+	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
+	clk_disable(adc->clk);
+
+	ret = devm_add_action_or_reset(dev, ingenic_adc_clk_cleanup, adc->clk);
+	if (ret) {
+		dev_err(dev, "Unable to add action\n");
+		return ret;
+	}
+
+	iio_dev->dev.parent = dev;
+	iio_dev->name = "jz-adc";
+	iio_dev->modes = INDIO_DIRECT_MODE;
+	iio_dev->channels = ingenic_channels;
+	iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
+	iio_dev->info = &ingenic_adc_info;
+
+	ret = devm_iio_device_register(dev, iio_dev);
+	if (ret)
+		dev_err(dev, "Unable to register IIO device\n");
+
+	return ret;
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id ingenic_adc_of_match[] = {
+	{ .compatible = "ingenic,jz4725b-adc", .data = &jz4725b_adc_soc_data, },
+	{ .compatible = "ingenic,jz4740-adc", .data = &jz4740_adc_soc_data, },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ingenic_adc_of_match);
+#endif
+
+static struct platform_driver ingenic_adc_driver = {
+	.driver = {
+		.name = "ingenic-adc",
+		.of_match_table = of_match_ptr(ingenic_adc_of_match),
+	},
+	.probe = ingenic_adc_probe,
+};
+module_platform_driver(ingenic_adc_driver);
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/lpc32xx_adc.c b/drivers/iio/adc/lpc32xx_adc.c
index 20b36690fa4f..e361c1532a75 100644
--- a/drivers/iio/adc/lpc32xx_adc.c
+++ b/drivers/iio/adc/lpc32xx_adc.c
@@ -1,23 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  *  lpc32xx_adc.c - Support for ADC in LPC32XX
  *
  *  3-channel, 10-bit ADC
  *
  *  Copyright (C) 2011, 2012 Roland Stigge <stigge@antcom.de>
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; either version 2 of the License, or
- *  (at your option) any later version.
- *
- *  This program is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with this program; if not, write to the Free Software
- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 #include <linux/module.h>
diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 729becb2d3d9..f8600fbcdfe3 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -26,6 +26,7 @@
 #include <linux/platform_device.h>
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
+#include <linux/mfd/syscon.h>
 
 #define MESON_SAR_ADC_REG0					0x00
 	#define MESON_SAR_ADC_REG0_PANEL_DETECT			BIT(31)
@@ -174,6 +175,9 @@
 #define MESON_SAR_ADC_EFUSE_BYTE3_UPPER_ADC_VAL			GENMASK(6, 0)
 #define MESON_SAR_ADC_EFUSE_BYTE3_IS_CALIBRATED			BIT(7)
 
+#define MESON_HHI_DPLL_TOP_0					0x318
+#define MESON_HHI_DPLL_TOP_0_TSC_BIT4				BIT(9)
+
 /* for use with IIO_VAL_INT_PLUS_MICRO */
 #define MILLION							1000000
 
@@ -280,6 +284,7 @@ struct meson_sar_adc_priv {
 	struct completion			done;
 	int					calibbias;
 	int					calibscale;
+	struct regmap				*tsc_regmap;
 	bool					temperature_sensor_calibrated;
 	u8					temperature_sensor_coefficient;
 	u16					temperature_sensor_adc_val;
@@ -727,6 +732,15 @@ static int meson_sar_adc_temp_sensor_init(struct iio_dev *indio_dev)
 		return ret;
 	}
 
+	priv->tsc_regmap =
+		syscon_regmap_lookup_by_phandle(indio_dev->dev.parent->of_node,
+						"amlogic,hhi-sysctrl");
+	if (IS_ERR(priv->tsc_regmap)) {
+		dev_err(indio_dev->dev.parent,
+			"failed to get amlogic,hhi-sysctrl regmap\n");
+		return PTR_ERR(priv->tsc_regmap);
+	}
+
 	read_len = MESON_SAR_ADC_EFUSE_BYTES;
 	buf = nvmem_cell_read(temperature_calib, &read_len);
 	if (IS_ERR(buf)) {
@@ -861,6 +875,22 @@ static int meson_sar_adc_init(struct iio_dev *indio_dev)
 				    priv->temperature_sensor_coefficient);
 		regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
 				   MESON_SAR_ADC_DELTA_10_TS_C_MASK, regval);
+
+		if (priv->param->temperature_trimming_bits == 5) {
+			if (priv->temperature_sensor_coefficient & BIT(4))
+				regval = MESON_HHI_DPLL_TOP_0_TSC_BIT4;
+			else
+				regval = 0;
+
+			/*
+			 * bit [4] (the 5th bit when starting to count at 1)
+			 * of the TSC is located in the HHI register area.
+			 */
+			regmap_update_bits(priv->tsc_regmap,
+					   MESON_HHI_DPLL_TOP_0,
+					   MESON_HHI_DPLL_TOP_0_TSC_BIT4,
+					   regval);
+		}
 	} else {
 		regmap_update_bits(priv->regmap, MESON_SAR_ADC_DELTA_10,
 				   MESON_SAR_ADC_DELTA_10_TS_REVE1, 0);
@@ -1064,6 +1094,9 @@ static const struct meson_sar_adc_param meson_sar_adc_meson8b_param = {
 	.bandgap_reg = MESON_SAR_ADC_DELTA_10,
 	.regmap_config = &meson_sar_adc_regmap_config_meson8,
 	.resolution = 10,
+	.temperature_trimming_bits = 5,
+	.temperature_multiplier = 10,
+	.temperature_divider = 32,
 };
 
 static const struct meson_sar_adc_param meson_sar_adc_gxbb_param = {
diff --git a/drivers/iio/adc/npcm_adc.c b/drivers/iio/adc/npcm_adc.c
new file mode 100644
index 000000000000..9e25bbec9c70
--- /dev/null
+++ b/drivers/iio/adc/npcm_adc.c
@@ -0,0 +1,335 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Nuvoton Technology corporation.
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/io.h>
+#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spinlock.h>
+#include <linux/uaccess.h>
+
+struct npcm_adc {
+	bool int_status;
+	u32 adc_sample_hz;
+	struct device *dev;
+	void __iomem *regs;
+	struct clk *adc_clk;
+	wait_queue_head_t wq;
+	struct regulator *vref;
+	struct regmap *rst_regmap;
+};
+
+/* NPCM7xx reset module */
+#define NPCM7XX_IPSRST1_OFFSET		0x020
+#define NPCM7XX_IPSRST1_ADC_RST		BIT(27)
+
+/* ADC registers */
+#define NPCM_ADCCON	 0x00
+#define NPCM_ADCDATA	 0x04
+
+/* ADCCON Register Bits */
+#define NPCM_ADCCON_ADC_INT_EN		BIT(21)
+#define NPCM_ADCCON_REFSEL		BIT(19)
+#define NPCM_ADCCON_ADC_INT_ST		BIT(18)
+#define NPCM_ADCCON_ADC_EN		BIT(17)
+#define NPCM_ADCCON_ADC_RST		BIT(16)
+#define NPCM_ADCCON_ADC_CONV		BIT(13)
+
+#define NPCM_ADCCON_CH_MASK		GENMASK(27, 24)
+#define NPCM_ADCCON_CH(x)		((x) << 24)
+#define NPCM_ADCCON_DIV_SHIFT		1
+#define NPCM_ADCCON_DIV_MASK		GENMASK(8, 1)
+#define NPCM_ADC_DATA_MASK(x)		((x) & GENMASK(9, 0))
+
+#define NPCM_ADC_ENABLE		(NPCM_ADCCON_ADC_EN | NPCM_ADCCON_ADC_INT_EN)
+
+/* ADC General Definition */
+#define NPCM_RESOLUTION_BITS		10
+#define NPCM_INT_VREF_MV		2000
+
+#define NPCM_ADC_CHAN(ch) {					\
+	.type = IIO_VOLTAGE,					\
+	.indexed = 1,						\
+	.channel = ch,						\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) |	\
+				BIT(IIO_CHAN_INFO_SAMP_FREQ),	\
+}
+
+static const struct iio_chan_spec npcm_adc_iio_channels[] = {
+	NPCM_ADC_CHAN(0),
+	NPCM_ADC_CHAN(1),
+	NPCM_ADC_CHAN(2),
+	NPCM_ADC_CHAN(3),
+	NPCM_ADC_CHAN(4),
+	NPCM_ADC_CHAN(5),
+	NPCM_ADC_CHAN(6),
+	NPCM_ADC_CHAN(7),
+};
+
+static irqreturn_t npcm_adc_isr(int irq, void *data)
+{
+	u32 regtemp;
+	struct iio_dev *indio_dev = data;
+	struct npcm_adc *info = iio_priv(indio_dev);
+
+	regtemp = ioread32(info->regs + NPCM_ADCCON);
+	if (regtemp & NPCM_ADCCON_ADC_INT_ST) {
+		iowrite32(regtemp, info->regs + NPCM_ADCCON);
+		wake_up_interruptible(&info->wq);
+		info->int_status = true;
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int npcm_adc_read(struct npcm_adc *info, int *val, u8 channel)
+{
+	int ret;
+	u32 regtemp;
+
+	/* Select ADC channel */
+	regtemp = ioread32(info->regs + NPCM_ADCCON);
+	regtemp &= ~NPCM_ADCCON_CH_MASK;
+	info->int_status = false;
+	iowrite32(regtemp | NPCM_ADCCON_CH(channel) |
+		  NPCM_ADCCON_ADC_CONV, info->regs + NPCM_ADCCON);
+
+	ret = wait_event_interruptible_timeout(info->wq, info->int_status,
+					       msecs_to_jiffies(10));
+	if (ret == 0) {
+		regtemp = ioread32(info->regs + NPCM_ADCCON);
+		if ((regtemp & NPCM_ADCCON_ADC_CONV) && info->rst_regmap) {
+			/* if conversion failed - reset ADC module */
+			regmap_write(info->rst_regmap, NPCM7XX_IPSRST1_OFFSET,
+				     NPCM7XX_IPSRST1_ADC_RST);
+			msleep(100);
+			regmap_write(info->rst_regmap, NPCM7XX_IPSRST1_OFFSET,
+				     0x0);
+			msleep(100);
+
+			/* Enable ADC and start conversion module */
+			iowrite32(NPCM_ADC_ENABLE | NPCM_ADCCON_ADC_CONV,
+				  info->regs + NPCM_ADCCON);
+			dev_err(info->dev, "RESET ADC Complete\n");
+		}
+		return -ETIMEDOUT;
+	}
+	if (ret < 0)
+		return ret;
+
+	*val = NPCM_ADC_DATA_MASK(ioread32(info->regs + NPCM_ADCDATA));
+
+	return 0;
+}
+
+static int npcm_adc_read_raw(struct iio_dev *indio_dev,
+			     struct iio_chan_spec const *chan, int *val,
+			     int *val2, long mask)
+{
+	int ret;
+	int vref_uv;
+	struct npcm_adc *info = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		mutex_lock(&indio_dev->mlock);
+		ret = npcm_adc_read(info, val, chan->channel);
+		mutex_unlock(&indio_dev->mlock);
+		if (ret) {
+			dev_err(info->dev, "NPCM ADC read failed\n");
+			return ret;
+		}
+		return IIO_VAL_INT;
+	case IIO_CHAN_INFO_SCALE:
+		if (info->vref) {
+			vref_uv = regulator_get_voltage(info->vref);
+			*val = vref_uv / 1000;
+		} else {
+			*val = NPCM_INT_VREF_MV;
+		}
+		*val2 = NPCM_RESOLUTION_BITS;
+		return IIO_VAL_FRACTIONAL_LOG2;
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*val = info->adc_sample_hz;
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static const struct iio_info npcm_adc_iio_info = {
+	.read_raw = &npcm_adc_read_raw,
+};
+
+static const struct of_device_id npcm_adc_match[] = {
+	{ .compatible = "nuvoton,npcm750-adc", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, npcm_adc_match);
+
+static int npcm_adc_probe(struct platform_device *pdev)
+{
+	int ret;
+	int irq;
+	u32 div;
+	u32 reg_con;
+	struct resource *res;
+	struct npcm_adc *info;
+	struct iio_dev *indio_dev;
+	struct device *dev = &pdev->dev;
+	struct device_node *np = pdev->dev.of_node;
+
+	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*info));
+	if (!indio_dev)
+		return -ENOMEM;
+	info = iio_priv(indio_dev);
+
+	info->dev = &pdev->dev;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	info->regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(info->regs))
+		return PTR_ERR(info->regs);
+
+	info->adc_clk = devm_clk_get(&pdev->dev, NULL);
+	if (IS_ERR(info->adc_clk)) {
+		dev_warn(&pdev->dev, "ADC clock failed: can't read clk\n");
+		return PTR_ERR(info->adc_clk);
+	}
+
+	/* calculate ADC clock sample rate */
+	reg_con = ioread32(info->regs + NPCM_ADCCON);
+	div = reg_con & NPCM_ADCCON_DIV_MASK;
+	div = div >> NPCM_ADCCON_DIV_SHIFT;
+	info->adc_sample_hz = clk_get_rate(info->adc_clk) / ((div + 1) * 2);
+
+	if (of_device_is_compatible(np, "nuvoton,npcm750-adc")) {
+		info->rst_regmap = syscon_regmap_lookup_by_compatible
+			("nuvoton,npcm750-rst");
+		if (IS_ERR(info->rst_regmap)) {
+			dev_err(&pdev->dev, "Failed to find nuvoton,npcm750-rst\n");
+			ret = PTR_ERR(info->rst_regmap);
+			goto err_disable_clk;
+		}
+	}
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq <= 0) {
+		dev_err(dev, "failed getting interrupt resource\n");
+		ret = -EINVAL;
+		goto err_disable_clk;
+	}
+
+	ret = devm_request_irq(&pdev->dev, irq, npcm_adc_isr, 0,
+			       "NPCM_ADC", indio_dev);
+	if (ret < 0) {
+		dev_err(dev, "failed requesting interrupt\n");
+		goto err_disable_clk;
+	}
+
+	reg_con = ioread32(info->regs + NPCM_ADCCON);
+	info->vref = devm_regulator_get_optional(&pdev->dev, "vref");
+	if (!IS_ERR(info->vref)) {
+		ret = regulator_enable(info->vref);
+		if (ret) {
+			dev_err(&pdev->dev, "Can't enable ADC reference voltage\n");
+			goto err_disable_clk;
+		}
+
+		iowrite32(reg_con & ~NPCM_ADCCON_REFSEL,
+			  info->regs + NPCM_ADCCON);
+	} else {
+		/*
+		 * Any error which is not ENODEV indicates the regulator
+		 * has been specified and so is a failure case.
+		 */
+		if (PTR_ERR(info->vref) != -ENODEV) {
+			ret = PTR_ERR(info->vref);
+			goto err_disable_clk;
+		}
+
+		/* Use internal reference */
+		iowrite32(reg_con | NPCM_ADCCON_REFSEL,
+			  info->regs + NPCM_ADCCON);
+	}
+
+	init_waitqueue_head(&info->wq);
+
+	reg_con = ioread32(info->regs + NPCM_ADCCON);
+	reg_con |= NPCM_ADC_ENABLE;
+
+	/* Enable the ADC Module */
+	iowrite32(reg_con, info->regs + NPCM_ADCCON);
+
+	/* Start ADC conversion */
+	iowrite32(reg_con | NPCM_ADCCON_ADC_CONV, info->regs + NPCM_ADCCON);
+
+	platform_set_drvdata(pdev, indio_dev);
+	indio_dev->name = dev_name(&pdev->dev);
+	indio_dev->dev.parent = &pdev->dev;
+	indio_dev->info = &npcm_adc_iio_info;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = npcm_adc_iio_channels;
+	indio_dev->num_channels = ARRAY_SIZE(npcm_adc_iio_channels);
+
+	ret = iio_device_register(indio_dev);
+	if (ret) {
+		dev_err(&pdev->dev, "Couldn't register the device.\n");
+		goto err_iio_register;
+	}
+
+	pr_info("NPCM ADC driver probed\n");
+
+	return 0;
+
+err_iio_register:
+	iowrite32(reg_con & ~NPCM_ADCCON_ADC_EN, info->regs + NPCM_ADCCON);
+	if (!IS_ERR(info->vref))
+		regulator_disable(info->vref);
+err_disable_clk:
+	clk_disable_unprepare(info->adc_clk);
+
+	return ret;
+}
+
+static int npcm_adc_remove(struct platform_device *pdev)
+{
+	struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+	struct npcm_adc *info = iio_priv(indio_dev);
+	u32 regtemp;
+
+	iio_device_unregister(indio_dev);
+
+	regtemp = ioread32(info->regs + NPCM_ADCCON);
+	iowrite32(regtemp & ~NPCM_ADCCON_ADC_EN, info->regs + NPCM_ADCCON);
+	if (!IS_ERR(info->vref))
+		regulator_disable(info->vref);
+	clk_disable_unprepare(info->adc_clk);
+
+	return 0;
+}
+
+static struct platform_driver npcm_adc_driver = {
+	.probe		= npcm_adc_probe,
+	.remove		= npcm_adc_remove,
+	.driver		= {
+		.name	= "npcm_adc",
+		.of_match_table = npcm_adc_match,
+	},
+};
+
+module_platform_driver(npcm_adc_driver);
+
+MODULE_DESCRIPTION("Nuvoton NPCM ADC Driver");
+MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/qcom-pm8xxx-xoadc.c b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
index c30c002f1fef..4735f8a1ca9d 100644
--- a/drivers/iio/adc/qcom-pm8xxx-xoadc.c
+++ b/drivers/iio/adc/qcom-pm8xxx-xoadc.c
@@ -423,18 +423,14 @@ static irqreturn_t pm8xxx_eoc_irq(int irq, void *d)
 static struct pm8xxx_chan_info *
 pm8xxx_get_channel(struct pm8xxx_xoadc *adc, u8 chan)
 {
-	struct pm8xxx_chan_info *ch;
 	int i;
 
 	for (i = 0; i < adc->nchans; i++) {
-		ch = &adc->chans[i];
+		struct pm8xxx_chan_info *ch = &adc->chans[i];
 		if (ch->hwchan->amux_channel == chan)
-			break;
+			return ch;
 	}
-	if (i == adc->nchans)
-		return NULL;
-
-	return ch;
+	return NULL;
 }
 
 static int pm8xxx_read_channel_rsv(struct pm8xxx_xoadc *adc,
diff --git a/drivers/iio/adc/ti-ads124s08.c b/drivers/iio/adc/ti-ads124s08.c
new file mode 100644
index 000000000000..53f17e4f2f23
--- /dev/null
+++ b/drivers/iio/adc/ti-ads124s08.c
@@ -0,0 +1,376 @@
+// SPDX-License-Identifier: GPL-2.0
+/* TI ADS124S0X chip family driver
+ * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com/
+ */
+
+#include <linux/err.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/sysfs.h>
+
+/* Commands */
+#define ADS124S08_CMD_NOP	0x00
+#define ADS124S08_CMD_WAKEUP	0x02
+#define ADS124S08_CMD_PWRDWN	0x04
+#define ADS124S08_CMD_RESET	0x06
+#define ADS124S08_CMD_START	0x08
+#define ADS124S08_CMD_STOP	0x0a
+#define ADS124S08_CMD_SYOCAL	0x16
+#define ADS124S08_CMD_SYGCAL	0x17
+#define ADS124S08_CMD_SFOCAL	0x19
+#define ADS124S08_CMD_RDATA	0x12
+#define ADS124S08_CMD_RREG	0x20
+#define ADS124S08_CMD_WREG	0x40
+
+/* Registers */
+#define ADS124S08_ID_REG	0x00
+#define ADS124S08_STATUS	0x01
+#define ADS124S08_INPUT_MUX	0x02
+#define ADS124S08_PGA		0x03
+#define ADS124S08_DATA_RATE	0x04
+#define ADS124S08_REF		0x05
+#define ADS124S08_IDACMAG	0x06
+#define ADS124S08_IDACMUX	0x07
+#define ADS124S08_VBIAS		0x08
+#define ADS124S08_SYS		0x09
+#define ADS124S08_OFCAL0	0x0a
+#define ADS124S08_OFCAL1	0x0b
+#define ADS124S08_OFCAL2	0x0c
+#define ADS124S08_FSCAL0	0x0d
+#define ADS124S08_FSCAL1	0x0e
+#define ADS124S08_FSCAL2	0x0f
+#define ADS124S08_GPIODAT	0x10
+#define ADS124S08_GPIOCON	0x11
+
+/* ADS124S0x common channels */
+#define ADS124S08_AIN0		0x00
+#define ADS124S08_AIN1		0x01
+#define ADS124S08_AIN2		0x02
+#define ADS124S08_AIN3		0x03
+#define ADS124S08_AIN4		0x04
+#define ADS124S08_AIN5		0x05
+#define ADS124S08_AINCOM	0x0c
+/* ADS124S08 only channels */
+#define ADS124S08_AIN6		0x06
+#define ADS124S08_AIN7		0x07
+#define ADS124S08_AIN8		0x08
+#define ADS124S08_AIN9		0x09
+#define ADS124S08_AIN10		0x0a
+#define ADS124S08_AIN11		0x0b
+#define ADS124S08_MAX_CHANNELS	12
+
+#define ADS124S08_POS_MUX_SHIFT	0x04
+#define ADS124S08_INT_REF		0x09
+
+#define ADS124S08_START_REG_MASK	0x1f
+#define ADS124S08_NUM_BYTES_MASK	0x1f
+
+#define ADS124S08_START_CONV	0x01
+#define ADS124S08_STOP_CONV	0x00
+
+enum ads124s_id {
+	ADS124S08_ID,
+	ADS124S06_ID,
+};
+
+struct ads124s_chip_info {
+	const struct iio_chan_spec *channels;
+	unsigned int num_channels;
+};
+
+struct ads124s_private {
+	const struct ads124s_chip_info	*chip_info;
+	struct gpio_desc *reset_gpio;
+	struct spi_device *spi;
+	struct mutex lock;
+	u8 data[5] ____cacheline_aligned;
+};
+
+#define ADS124S08_CHAN(index)					\
+{								\
+	.type = IIO_VOLTAGE,					\
+	.indexed = 1,						\
+	.channel = index,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
+	.scan_index = index,					\
+	.scan_type = {						\
+		.sign = 'u',					\
+		.realbits = 32,					\
+		.storagebits = 32,				\
+	},							\
+}
+
+static const struct iio_chan_spec ads124s06_channels[] = {
+	ADS124S08_CHAN(0),
+	ADS124S08_CHAN(1),
+	ADS124S08_CHAN(2),
+	ADS124S08_CHAN(3),
+	ADS124S08_CHAN(4),
+	ADS124S08_CHAN(5),
+};
+
+static const struct iio_chan_spec ads124s08_channels[] = {
+	ADS124S08_CHAN(0),
+	ADS124S08_CHAN(1),
+	ADS124S08_CHAN(2),
+	ADS124S08_CHAN(3),
+	ADS124S08_CHAN(4),
+	ADS124S08_CHAN(5),
+	ADS124S08_CHAN(6),
+	ADS124S08_CHAN(7),
+	ADS124S08_CHAN(8),
+	ADS124S08_CHAN(9),
+	ADS124S08_CHAN(10),
+	ADS124S08_CHAN(11),
+};
+
+static const struct ads124s_chip_info ads124s_chip_info_tbl[] = {
+	[ADS124S08_ID] = {
+		.channels = ads124s08_channels,
+		.num_channels = ARRAY_SIZE(ads124s08_channels),
+	},
+	[ADS124S06_ID] = {
+		.channels = ads124s06_channels,
+		.num_channels = ARRAY_SIZE(ads124s06_channels),
+	},
+};
+
+static int ads124s_write_cmd(struct iio_dev *indio_dev, u8 command)
+{
+	struct ads124s_private *priv = iio_priv(indio_dev);
+
+	priv->data[0] = command;
+
+	return spi_write(priv->spi, &priv->data[0], 1);
+}
+
+static int ads124s_write_reg(struct iio_dev *indio_dev, u8 reg, u8 data)
+{
+	struct ads124s_private *priv = iio_priv(indio_dev);
+
+	priv->data[0] = ADS124S08_CMD_WREG | reg;
+	priv->data[1] = 0x0;
+	priv->data[2] = data;
+
+	return spi_write(priv->spi, &priv->data[0], 3);
+}
+
+static int ads124s_reset(struct iio_dev *indio_dev)
+{
+	struct ads124s_private *priv = iio_priv(indio_dev);
+
+	if (priv->reset_gpio) {
+		gpiod_set_value(priv->reset_gpio, 0);
+		udelay(200);
+		gpiod_set_value(priv->reset_gpio, 1);
+	} else {
+		return ads124s_write_cmd(indio_dev, ADS124S08_CMD_RESET);
+	}
+
+	return 0;
+};
+
+static int ads124s_read(struct iio_dev *indio_dev, unsigned int chan)
+{
+	struct ads124s_private *priv = iio_priv(indio_dev);
+	int ret;
+	u32 tmp;
+	struct spi_transfer t[] = {
+		{
+			.tx_buf = &priv->data[0],
+			.len = 4,
+			.cs_change = 1,
+		}, {
+			.tx_buf = &priv->data[1],
+			.rx_buf = &priv->data[1],
+			.len = 4,
+		},
+	};
+
+	priv->data[0] = ADS124S08_CMD_RDATA;
+	memset(&priv->data[1], ADS124S08_CMD_NOP, sizeof(priv->data));
+
+	ret = spi_sync_transfer(priv->spi, t, ARRAY_SIZE(t));
+	if (ret < 0)
+		return ret;
+
+	tmp = priv->data[2] << 16 | priv->data[3] << 8 | priv->data[4];
+
+	return tmp;
+}
+
+static int ads124s_read_raw(struct iio_dev *indio_dev,
+			    struct iio_chan_spec const *chan,
+			    int *val, int *val2, long m)
+{
+	struct ads124s_private *priv = iio_priv(indio_dev);
+	int ret;
+
+	mutex_lock(&priv->lock);
+	switch (m) {
+	case IIO_CHAN_INFO_RAW:
+		ret = ads124s_write_reg(indio_dev, ADS124S08_INPUT_MUX,
+					chan->channel);
+		if (ret) {
+			dev_err(&priv->spi->dev, "Set ADC CH failed\n");
+			goto out;
+		}
+
+		ret = ads124s_write_cmd(indio_dev, ADS124S08_START_CONV);
+		if (ret) {
+			dev_err(&priv->spi->dev, "Start conversions failed\n");
+			goto out;
+		}
+
+		ret = ads124s_read(indio_dev, chan->channel);
+		if (ret < 0) {
+			dev_err(&priv->spi->dev, "Read ADC failed\n");
+			goto out;
+		}
+
+		*val = ret;
+
+		ret = ads124s_write_cmd(indio_dev, ADS124S08_STOP_CONV);
+		if (ret) {
+			dev_err(&priv->spi->dev, "Stop conversions failed\n");
+			goto out;
+		}
+
+		ret = IIO_VAL_INT;
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+out:
+	mutex_unlock(&priv->lock);
+	return ret;
+}
+
+static const struct iio_info ads124s_info = {
+	.read_raw = &ads124s_read_raw,
+};
+
+static irqreturn_t ads124s_trigger_handler(int irq, void *p)
+{
+	struct iio_poll_func *pf = p;
+	struct iio_dev *indio_dev = pf->indio_dev;
+	struct ads124s_private *priv = iio_priv(indio_dev);
+	u32 buffer[ADS124S08_MAX_CHANNELS + sizeof(s64)/sizeof(u16)];
+	int scan_index, j = 0;
+	int ret;
+
+	for_each_set_bit(scan_index, indio_dev->active_scan_mask,
+			 indio_dev->masklength) {
+		ret = ads124s_write_reg(indio_dev, ADS124S08_INPUT_MUX,
+					scan_index);
+		if (ret)
+			dev_err(&priv->spi->dev, "Set ADC CH failed\n");
+
+		ret = ads124s_write_cmd(indio_dev, ADS124S08_START_CONV);
+		if (ret)
+			dev_err(&priv->spi->dev, "Start ADC conversions failed\n");
+
+		buffer[j] = ads124s_read(indio_dev, scan_index);
+		ret = ads124s_write_cmd(indio_dev, ADS124S08_STOP_CONV);
+		if (ret)
+			dev_err(&priv->spi->dev, "Stop ADC conversions failed\n");
+
+		j++;
+	}
+
+	iio_push_to_buffers_with_timestamp(indio_dev, buffer,
+			pf->timestamp);
+
+	iio_trigger_notify_done(indio_dev->trig);
+
+	return IRQ_HANDLED;
+}
+
+static int ads124s_probe(struct spi_device *spi)
+{
+	struct ads124s_private *ads124s_priv;
+	struct iio_dev *indio_dev;
+	const struct spi_device_id *spi_id = spi_get_device_id(spi);
+	int ret;
+
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*ads124s_priv));
+	if (indio_dev == NULL)
+		return -ENOMEM;
+
+	ads124s_priv = iio_priv(indio_dev);
+
+	ads124s_priv->reset_gpio = devm_gpiod_get_optional(&spi->dev,
+						   "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ads124s_priv->reset_gpio))
+		dev_info(&spi->dev, "Reset GPIO not defined\n");
+
+	ads124s_priv->chip_info = &ads124s_chip_info_tbl[spi_id->driver_data];
+
+	spi_set_drvdata(spi, indio_dev);
+
+	ads124s_priv->spi = spi;
+
+	indio_dev->name = spi_id->name;
+	indio_dev->dev.parent = &spi->dev;
+	indio_dev->dev.of_node = spi->dev.of_node;
+	indio_dev->modes = INDIO_DIRECT_MODE;
+	indio_dev->channels = ads124s_priv->chip_info->channels;
+	indio_dev->num_channels = ads124s_priv->chip_info->num_channels;
+	indio_dev->info = &ads124s_info;
+
+	mutex_init(&ads124s_priv->lock);
+
+	ret = devm_iio_triggered_buffer_setup(&spi->dev, indio_dev, NULL,
+					      ads124s_trigger_handler, NULL);
+	if (ret) {
+		dev_err(&spi->dev, "iio triggered buffer setup failed\n");
+		return ret;
+	}
+
+	ads124s_reset(indio_dev);
+
+	return devm_iio_device_register(&spi->dev, indio_dev);
+}
+
+static const struct spi_device_id ads124s_id[] = {
+	{ "ads124s06", ADS124S06_ID },
+	{ "ads124s08", ADS124S08_ID },
+	{ }
+};
+MODULE_DEVICE_TABLE(spi, ads124s_id);
+
+static const struct of_device_id ads124s_of_table[] = {
+	{ .compatible = "ti,ads124s06" },
+	{ .compatible = "ti,ads124s08" },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, ads124s_of_table);
+
+static struct spi_driver ads124s_driver = {
+	.driver = {
+		.name	= "ads124s08",
+		.of_match_table = ads124s_of_table,
+	},
+	.probe		= ads124s_probe,
+	.id_table	= ads124s_id,
+};
+module_spi_driver(ads124s_driver);
+
+MODULE_AUTHOR("Dan Murphy <dmuprhy@ti.com>");
+MODULE_DESCRIPTION("TI TI_ADS12S0X ADC");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/adc/xilinx-xadc-core.c b/drivers/iio/adc/xilinx-xadc-core.c
index 3f6be5ac049a..b13c61539d46 100644
--- a/drivers/iio/adc/xilinx-xadc-core.c
+++ b/drivers/iio/adc/xilinx-xadc-core.c
@@ -1273,8 +1273,10 @@ static int xadc_probe(struct platform_device *pdev)
 			xadc->threshold[i] = 0xffff;
 		else
 			xadc->threshold[i] = 0;
-		xadc_write_adc_reg(xadc, XADC_REG_THRESHOLD(i),
+		ret = xadc_write_adc_reg(xadc, XADC_REG_THRESHOLD(i),
 			xadc->threshold[i]);
+		if (ret)
+			goto err_free_irq;
 	}
 
 	/* Go to non-buffered mode */