Merge tag 'i2c-for-6.11-rc1-second-batch' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull more i2c updates from Wolfram Sang:
 "The I2C core has two header documentation updates as the dependecies
  are in now.

  The I2C host drivers add some patches which nearly fell through the
  cracks:

   - Added descriptions in the DTS for the Qualcomm SM8650 and SM8550
     Camera Control Interface (CCI).

   - Added support for the "settle-time-us" property, which allows the
     gpio-mux device to switch from one bus to another with a
     configurable delay. The time can be set in the DTS. The latest
     change also includes file sorting.

   - Fixed slot numbering in the SMBus framework to prevent failures
     when more than 8 slots are occupied. It now enforces a a maximum of
     8 slots to be used. This ensures that the Intel PIIX4 device can
     register the SPDs correctly without failure, even if other slots
     are populated but not used"

* tag 'i2c-for-6.11-rc1-second-batch' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: header: improve kdoc for i2c_algorithm
  i2c: header: remove unneeded stuff regarding i2c_algorithm
  i2c: piix4: Register SPDs
  i2c: smbus: remove i801 assumptions from SPD probing
  i2c: mux: gpio: Add support for the 'settle-time-us' property
  i2c: mux: gpio: Re-order #include to match alphabetic order
  dt-bindings: i2c: mux-gpio: Add 'settle-time-us' property
  dt-bindings: i2c: qcom-cci: Document sm8650 compatible
  dt-bindings: i2c: qcom-cci: Document sm8550 compatible

4 files changed, 24 insertions, 15 deletions

diff --git a/drivers/i2c/busses/Kconfig b/drivers/i2c/busses/Kconfig
index 3e32fb882101..a22f9125322a 100644
--- a/drivers/i2c/busses/Kconfig
+++ b/drivers/i2c/busses/Kconfig
@@ -196,6 +196,7 @@ config I2C_ISMT
 config I2C_PIIX4
 	tristate "Intel PIIX4 and compatible (ATI/AMD/Serverworks/Broadcom/SMSC)"
 	depends on PCI && HAS_IOPORT
+	select I2C_SMBUS
 	help
 	  If you say yes to this option, support will be included for the Intel
 	  PIIX4 family of mainboard I2C interfaces.  Specifically, the following
diff --git a/drivers/i2c/busses/i2c-piix4.c b/drivers/i2c/busses/i2c-piix4.c
index 84aa18d1003b..4e32d57ae0bf 100644
--- a/drivers/i2c/busses/i2c-piix4.c
+++ b/drivers/i2c/busses/i2c-piix4.c
@@ -29,6 +29,7 @@
 #include <linux/stddef.h>
 #include <linux/ioport.h>
 #include <linux/i2c.h>
+#include <linux/i2c-smbus.h>
 #include <linux/slab.h>
 #include <linux/dmi.h>
 #include <linux/acpi.h>
@@ -982,6 +983,14 @@ static int piix4_add_adapter(struct pci_dev *dev, unsigned short smba,
 		return retval;
 	}
 
+	/*
+	 * The AUX bus can not be probed as on some platforms it reports all
+	 * devices present and all reads return "0".
+	 * This would allow the ee1004 to be probed incorrectly.
+	 */
+	if (port == 0)
+		i2c_register_spd(adap);
+
 	*padap = adap;
 	return 0;
 }
diff --git a/drivers/i2c/i2c-smbus.c b/drivers/i2c/i2c-smbus.c
index 1cb137b9181d..7e4203df83ed 100644
--- a/drivers/i2c/i2c-smbus.c
+++ b/drivers/i2c/i2c-smbus.c
@@ -352,18 +352,11 @@ void i2c_register_spd(struct i2c_adapter *adap)
 		return;
 
 	/*
-	 * If we're a child adapter on a muxed segment, then limit slots to 8,
-	 * as this is the max number of SPD EEPROMs that can be addressed per bus.
+	 * The max number of SPD EEPROMs that can be addressed per bus is 8.
+	 * If more slots are present either muxed or multiple busses are
+	 * necessary or the additional slots are ignored.
 	 */
-	if (i2c_parent_is_i2c_adapter(adap)) {
-		slot_count = 8;
-	} else {
-		if (slot_count > 8) {
-			dev_warn(&adap->dev,
-				 "More than 8 memory slots on a single bus, contact i801 maintainer to add missing mux config\n");
-			return;
-		}
-	}
+	slot_count = min(slot_count, 8);
 
 	/*
 	 * Memory types could be found at section 7.18.2 (Memory Device — Type), table 78
diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c
index d6bbb8b68333..944577bb09c1 100644
--- a/drivers/i2c/muxes/i2c-mux-gpio.c
+++ b/drivers/i2c/muxes/i2c-mux-gpio.c
@@ -5,16 +5,17 @@
  * Peter Korsgaard <peter.korsgaard@barco.com>
  */
 
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
 #include <linux/i2c.h>
 #include <linux/i2c-mux.h>
+#include <linux/module.h>
 #include <linux/overflow.h>
 #include <linux/platform_data/i2c-mux-gpio.h>
 #include <linux/platform_device.h>
-#include <linux/module.h>
 #include <linux/slab.h>
-#include <linux/bits.h>
-#include <linux/gpio/consumer.h>
-#include <linux/gpio/driver.h>
 
 struct gpiomux {
 	struct i2c_mux_gpio_platform_data data;
@@ -37,6 +38,9 @@ static int i2c_mux_gpio_select(struct i2c_mux_core *muxc, u32 chan)
 
 	i2c_mux_gpio_set(mux, chan);
 
+	if (mux->data.settle_time)
+		fsleep(mux->data.settle_time);
+
 	return 0;
 }
 
@@ -116,6 +120,8 @@ static int i2c_mux_gpio_probe_fw(struct gpiomux *mux,
 	if (device_property_read_u32(dev, "idle-state", &mux->data.idle))
 		mux->data.idle = I2C_MUX_GPIO_NO_IDLE;
 
+	device_property_read_u32(dev, "settle-time-us", &mux->data.settle_time);
+
 	return 0;
 }