Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "The main thing is to allow empty id_tables for ACPI to make some
  drivers get probed again. It looks a bit bigger than usual because it
  needs some internal renaming, too.

  Other than that, there is a fix for broken DSTDs, a super simple
  enablement for ARM MPS, and two documentation fixes which I'd like to
  see in v4.13 already"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: rephrase explanation of I2C_CLASS_DEPRECATED
  i2c: allow i2c-versatile for ARM MPS platforms
  i2c: designware: Some broken DSTDs use 1MiHz instead of 1MHz
  i2c: designware: Print clock freq on invalid clock freq error
  i2c: core: Allow empty id_table in ACPI case as well
  i2c: mux: pinctrl: mention correct module name in Kconfig help text

Author: torvalds

drivers/i2c/busses/Kconfig

@@ -983,7 +983,7 @@ config I2C_UNIPHIER_F
 
 config I2C_VERSATILE
 	tristate "ARM Versatile/Realview I2C bus support"
-	depends on ARCH_VERSATILE || ARCH_REALVIEW || ARCH_VEXPRESS || COMPILE_TEST
+	depends on ARCH_MPS2 || ARCH_VERSATILE || ARCH_REALVIEW || ARCH_VEXPRESS || COMPILE_TEST
 	select I2C_ALGOBIT
 	help
 	  Say yes if you want to support the I2C serial bus on ARMs Versatile

drivers/i2c/busses/i2c-designware-platdrv.c

@@ -298,6 +298,9 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 	}
 
 	acpi_speed = i2c_acpi_find_bus_speed(&pdev->dev);
+	/* Some broken DSTDs use 1MiHz instead of 1MHz */
+	if (acpi_speed == 1048576)
+		acpi_speed = 1000000;
 	/*
 	 * Find bus speed from the "clock-frequency" device property, ACPI
 	 * or by using fast mode if neither is set.
@@ -319,7 +322,8 @@ static int dw_i2c_plat_probe(struct platform_device *pdev)
 	if (dev->clk_freq != 100000 && dev->clk_freq != 400000
 	    && dev->clk_freq != 1000000 && dev->clk_freq != 3400000) {
 		dev_err(&pdev->dev,
-			"Only 100kHz, 400kHz, 1MHz and 3.4MHz supported");
+			"%d Hz is unsupported, only 100kHz, 400kHz, 1MHz and 3.4MHz are supported\n",
+			dev->clk_freq);
 		ret = -EINVAL;
 		goto exit_reset;
 	}

drivers/i2c/i2c-core-acpi.c

@@ -230,6 +230,16 @@ void i2c_acpi_register_devices(struct i2c_adapter *adap)
 		dev_warn(&adap->dev, "failed to enumerate I2C slaves\n");
 }
 
+const struct acpi_device_id *
+i2c_acpi_match_device(const struct acpi_device_id *matches,
+		      struct i2c_client *client)
+{
+	if (!(client && matches))
+		return NULL;
+
+	return acpi_match_device(matches, &client->dev);
+}
+
 static acpi_status i2c_acpi_lookup_speed(acpi_handle handle, u32 level,
 					   void *data, void **return_value)
 {
@@ -289,7 +299,7 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
 
-static int i2c_acpi_match_adapter(struct device *dev, void *data)
+static int i2c_acpi_find_match_adapter(struct device *dev, void *data)
 {
 	struct i2c_adapter *adapter = i2c_verify_adapter(dev);
 
@@ -299,7 +309,7 @@ static int i2c_acpi_match_adapter(struct device *dev, void *data)
 	return ACPI_HANDLE(dev) == (acpi_handle)data;
 }
 
-static int i2c_acpi_match_device(struct device *dev, void *data)
+static int i2c_acpi_find_match_device(struct device *dev, void *data)
 {
 	return ACPI_COMPANION(dev) == data;
 }
@@ -309,15 +319,16 @@ static struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
 	struct device *dev;
 
 	dev = bus_find_device(&i2c_bus_type, NULL, handle,
-			      i2c_acpi_match_adapter);
+			      i2c_acpi_find_match_adapter);
 	return dev ? i2c_verify_adapter(dev) : NULL;
 }
 
 static struct i2c_client *i2c_acpi_find_client_by_adev(struct acpi_device *adev)
 {
 	struct device *dev;
 
-	dev = bus_find_device(&i2c_bus_type, NULL, adev, i2c_acpi_match_device);
+	dev = bus_find_device(&i2c_bus_type, NULL, adev,
+			      i2c_acpi_find_match_device);
 	return dev ? i2c_verify_client(dev) : NULL;
 }
 

drivers/i2c/i2c-core-base.c

@@ -357,6 +357,7 @@ static int i2c_device_probe(struct device *dev)
 	 * Tree match table entry is supplied for the probing device.
 	 */
 	if (!driver->id_table &&
+	    !i2c_acpi_match_device(dev->driver->acpi_match_table, client) &&
 	    !i2c_of_match_device(dev->driver->of_match_table, client))
 		return -ENODEV;
 

drivers/i2c/i2c-core.h

@@ -31,9 +31,18 @@ int i2c_check_addr_validity(unsigned addr, unsigned short flags);
 int i2c_check_7bit_addr_validity_strict(unsigned short addr);
 
 #ifdef CONFIG_ACPI
+const struct acpi_device_id *
+i2c_acpi_match_device(const struct acpi_device_id *matches,
+		      struct i2c_client *client);
 void i2c_acpi_register_devices(struct i2c_adapter *adap);
 #else /* CONFIG_ACPI */
 static inline void i2c_acpi_register_devices(struct i2c_adapter *adap) { }
+static inline const struct acpi_device_id *
+i2c_acpi_match_device(const struct acpi_device_id *matches,
+		      struct i2c_client *client)
+{
+	return NULL;
+}
 #endif /* CONFIG_ACPI */
 extern struct notifier_block i2c_acpi_notifier;
 

drivers/i2c/muxes/Kconfig

@@ -83,7 +83,7 @@ config I2C_MUX_PINCTRL
 	  different sets of pins at run-time.
 
 	  This driver can also be built as a module. If so, the module will be
-	  called pinctrl-i2cmux.
+	  called i2c-mux-pinctrl.
 
 config I2C_MUX_REG
 	tristate "Register-based I2C multiplexer"

include/linux/i2c.h

@@ -689,7 +689,8 @@ i2c_unlock_adapter(struct i2c_adapter *adapter)
 #define I2C_CLASS_HWMON		(1<<0)	/* lm_sensors, ... */
 #define I2C_CLASS_DDC		(1<<3)	/* DDC bus on graphics adapters */
 #define I2C_CLASS_SPD		(1<<7)	/* Memory modules */
-#define I2C_CLASS_DEPRECATED	(1<<8)	/* Warn users that adapter will stop using classes */
+/* Warn users that the adapter doesn't support classes anymore */
+#define I2C_CLASS_DEPRECATED	(1<<8)
 
 /* Internal numbers to terminate lists */
 #define I2C_CLIENT_END		0xfffeU