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path: root/drivers/iio/frequency
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Diffstat (limited to 'drivers/iio/frequency')
-rw-r--r--drivers/iio/frequency/adf4350.c186
1 files changed, 176 insertions, 10 deletions
diff --git a/drivers/iio/frequency/adf4350.c b/drivers/iio/frequency/adf4350.c
index e76d4ace53ff..a4157cdb314d 100644
--- a/drivers/iio/frequency/adf4350.c
+++ b/drivers/iio/frequency/adf4350.c
@@ -1,7 +1,7 @@
/*
* ADF4350/ADF4351 SPI Wideband Synthesizer driver
*
- * Copyright 2012 Analog Devices Inc.
+ * Copyright 2012-2013 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
@@ -17,6 +17,9 @@
#include <linux/gcd.h>
#include <linux/gpio.h>
#include <asm/div64.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -33,6 +36,7 @@ struct adf4350_state {
struct spi_device *spi;
struct regulator *reg;
struct adf4350_platform_data *pdata;
+ struct clk *clk;
unsigned long clkin;
unsigned long chspc; /* Channel Spacing */
unsigned long fpfd; /* Phase Frequency Detector */
@@ -43,7 +47,7 @@ struct adf4350_state {
unsigned r4_rf_div_sel;
unsigned long regs[6];
unsigned long regs_hw[6];
-
+ unsigned long long freq_req;
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
@@ -52,7 +56,6 @@ struct adf4350_state {
};
static struct adf4350_platform_data default_pdata = {
- .clkin = 122880000,
.channel_spacing = 10000,
.r2_user_settings = ADF4350_REG2_PD_POLARITY_POS |
ADF4350_REG2_CHARGE_PUMP_CURR_uA(2500),
@@ -235,6 +238,7 @@ static int adf4350_set_freq(struct adf4350_state *st, unsigned long long freq)
ADF4350_REG4_MUTE_TILL_LOCK_EN));
st->regs[ADF4350_REG5] = ADF4350_REG5_LD_PIN_MODE_DIGITAL;
+ st->freq_req = freq;
return adf4350_sync_config(st);
}
@@ -246,6 +250,7 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
{
struct adf4350_state *st = iio_priv(indio_dev);
unsigned long long readin;
+ unsigned long tmp;
int ret;
ret = kstrtoull(buf, 10, &readin);
@@ -258,10 +263,23 @@ static ssize_t adf4350_write(struct iio_dev *indio_dev,
ret = adf4350_set_freq(st, readin);
break;
case ADF4350_FREQ_REFIN:
- if (readin > ADF4350_MAX_FREQ_REFIN)
+ if (readin > ADF4350_MAX_FREQ_REFIN) {
ret = -EINVAL;
- else
- st->clkin = readin;
+ break;
+ }
+
+ if (st->clk) {
+ tmp = clk_round_rate(st->clk, readin);
+ if (tmp != readin) {
+ ret = -EINVAL;
+ break;
+ }
+ ret = clk_set_rate(st->clk, tmp);
+ if (ret < 0)
+ break;
+ }
+ st->clkin = readin;
+ ret = adf4350_set_freq(st, st->freq_req);
break;
case ADF4350_FREQ_RESOLUTION:
if (readin == 0)
@@ -308,6 +326,9 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
}
break;
case ADF4350_FREQ_REFIN:
+ if (st->clk)
+ st->clkin = clk_get_rate(st->clk);
+
val = st->clkin;
break;
case ADF4350_FREQ_RESOLUTION:
@@ -318,6 +339,7 @@ static ssize_t adf4350_read(struct iio_dev *indio_dev,
break;
default:
ret = -EINVAL;
+ val = 0;
}
mutex_unlock(&indio_dev->mlock);
@@ -355,19 +377,153 @@ static const struct iio_info adf4350_info = {
.driver_module = THIS_MODULE,
};
+#ifdef CONFIG_OF
+static struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
+{
+ struct device_node *np = dev->of_node;
+ struct adf4350_platform_data *pdata;
+ unsigned int tmp;
+ int ret;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata) {
+ dev_err(dev, "could not allocate memory for platform data\n");
+ return NULL;
+ }
+
+ strncpy(&pdata->name[0], np->name, SPI_NAME_SIZE - 1);
+
+ tmp = 10000;
+ of_property_read_u32(np, "adi,channel-spacing", &tmp);
+ pdata->channel_spacing = tmp;
+
+ tmp = 0;
+ of_property_read_u32(np, "adi,power-up-frequency", &tmp);
+ pdata->power_up_frequency = tmp;
+
+ tmp = 0;
+ of_property_read_u32(np, "adi,reference-div-factor", &tmp);
+ pdata->ref_div_factor = tmp;
+
+ ret = of_get_gpio(np, 0);
+ if (ret < 0)
+ pdata->gpio_lock_detect = -1;
+ else
+ pdata->gpio_lock_detect = ret;
+
+ pdata->ref_doubler_en = of_property_read_bool(np,
+ "adi,reference-doubler-enable");
+ pdata->ref_div2_en = of_property_read_bool(np,
+ "adi,reference-div2-enable");
+
+ /* r2_user_settings */
+ pdata->r2_user_settings = of_property_read_bool(np,
+ "adi,phase-detector-polarity-positive-enable") ?
+ ADF4350_REG2_PD_POLARITY_POS : 0;
+ pdata->r2_user_settings |= of_property_read_bool(np,
+ "adi,lock-detect-precision-6ns-enable") ?
+ ADF4350_REG2_LDP_6ns : 0;
+ pdata->r2_user_settings |= of_property_read_bool(np,
+ "adi,lock-detect-function-integer-n-enable") ?
+ ADF4350_REG2_LDF_INT_N : 0;
+
+ tmp = 2500;
+ of_property_read_u32(np, "adi,charge-pump-current", &tmp);
+ pdata->r2_user_settings |= ADF4350_REG2_CHARGE_PUMP_CURR_uA(tmp);
+
+ tmp = 0;
+ of_property_read_u32(np, "adi,muxout-select", &tmp);
+ pdata->r2_user_settings |= ADF4350_REG2_MUXOUT(tmp);
+
+ pdata->r2_user_settings |= of_property_read_bool(np,
+ "adi,low-spur-mode-enable") ?
+ ADF4350_REG2_NOISE_MODE(0x3) : 0;
+
+ /* r3_user_settings */
+
+ pdata->r3_user_settings = of_property_read_bool(np,
+ "adi,cycle-slip-reduction-enable") ?
+ ADF4350_REG3_12BIT_CSR_EN : 0;
+ pdata->r3_user_settings |= of_property_read_bool(np,
+ "adi,charge-cancellation-enable") ?
+ ADF4351_REG3_CHARGE_CANCELLATION_EN : 0;
+
+ pdata->r3_user_settings |= of_property_read_bool(np,
+ "adi,anti-backlash-3ns-enable") ?
+ ADF4351_REG3_ANTI_BACKLASH_3ns_EN : 0;
+ pdata->r3_user_settings |= of_property_read_bool(np,
+ "adi,band-select-clock-mode-high-enable") ?
+ ADF4351_REG3_BAND_SEL_CLOCK_MODE_HIGH : 0;
+
+ tmp = 0;
+ of_property_read_u32(np, "adi,12bit-clk-divider", &tmp);
+ pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV(tmp);
+
+ tmp = 0;
+ of_property_read_u32(np, "adi,clk-divider-mode", &tmp);
+ pdata->r3_user_settings |= ADF4350_REG3_12BIT_CLKDIV_MODE(tmp);
+
+ /* r4_user_settings */
+
+ pdata->r4_user_settings = of_property_read_bool(np,
+ "adi,aux-output-enable") ?
+ ADF4350_REG4_AUX_OUTPUT_EN : 0;
+ pdata->r4_user_settings |= of_property_read_bool(np,
+ "adi,aux-output-fundamental-enable") ?
+ ADF4350_REG4_AUX_OUTPUT_FUND : 0;
+ pdata->r4_user_settings |= of_property_read_bool(np,
+ "adi,mute-till-lock-enable") ?
+ ADF4350_REG4_MUTE_TILL_LOCK_EN : 0;
+
+ tmp = 0;
+ of_property_read_u32(np, "adi,output-power", &tmp);
+ pdata->r4_user_settings |= ADF4350_REG4_OUTPUT_PWR(tmp);
+
+ tmp = 0;
+ of_property_read_u32(np, "adi,aux-output-power", &tmp);
+ pdata->r4_user_settings |= ADF4350_REG4_AUX_OUTPUT_PWR(tmp);
+
+ return pdata;
+}
+#else
+static
+struct adf4350_platform_data *adf4350_parse_dt(struct device *dev)
+{
+ return NULL;
+}
+#endif
+
static int adf4350_probe(struct spi_device *spi)
{
- struct adf4350_platform_data *pdata = spi->dev.platform_data;
+ struct adf4350_platform_data *pdata;
struct iio_dev *indio_dev;
struct adf4350_state *st;
+ struct clk *clk = NULL;
int ret;
+ if (spi->dev.of_node) {
+ pdata = adf4350_parse_dt(&spi->dev);
+ if (pdata == NULL)
+ return -EINVAL;
+ } else {
+ pdata = spi->dev.platform_data;
+ }
+
if (!pdata) {
dev_warn(&spi->dev, "no platform data? using default\n");
-
pdata = &default_pdata;
}
+ if (!pdata->clkin) {
+ clk = clk_get(&spi->dev, "clkin");
+ if (IS_ERR(clk))
+ return -EPROBE_DEFER;
+
+ ret = clk_prepare_enable(clk);
+ if (ret < 0)
+ return ret;
+ }
+
indio_dev = iio_device_alloc(sizeof(*st));
if (indio_dev == NULL)
return -ENOMEM;
@@ -395,7 +551,12 @@ static int adf4350_probe(struct spi_device *spi)
indio_dev->num_channels = 1;
st->chspc = pdata->channel_spacing;
- st->clkin = pdata->clkin;
+ if (clk) {
+ st->clk = clk;
+ st->clkin = clk_get_rate(clk);
+ } else {
+ st->clkin = pdata->clkin;
+ }
st->min_out_freq = spi_get_device_id(spi)->driver_data == 4351 ?
ADF4351_MIN_OUT_FREQ : ADF4350_MIN_OUT_FREQ;
@@ -435,6 +596,8 @@ error_put_reg:
if (!IS_ERR(st->reg))
regulator_put(st->reg);
+ if (clk)
+ clk_disable_unprepare(clk);
iio_device_free(indio_dev);
return ret;
@@ -451,6 +614,9 @@ static int adf4350_remove(struct spi_device *spi)
iio_device_unregister(indio_dev);
+ if (st->clk)
+ clk_disable_unprepare(st->clk);
+
if (!IS_ERR(reg)) {
regulator_disable(reg);
regulator_put(reg);
@@ -481,6 +647,6 @@ static struct spi_driver adf4350_driver = {
};
module_spi_driver(adf4350_driver);
-MODULE_AUTHOR("Michael Hennerich <[email protected]>");
+MODULE_AUTHOR("Michael Hennerich <[email protected]>");
MODULE_DESCRIPTION("Analog Devices ADF4350/ADF4351 PLL");
MODULE_LICENSE("GPL v2");
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