mfd: arizona: Replace arizona_of_get_type() with device_get_match_data()

Replace the custom arizona_of_get_type() function with the generic
device_get_match_data() helper. Besides being a nice cleanup this
also makes it easier to add support for binding to ACPI enumerated
devices.

While at it also fix a possible NULL pointer deref of the id
argument to the probe functions (this could happen on e.g. manual
driver binding through sysfs).

Suggested-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/arizona-core.c

@@ -797,17 +797,6 @@ const struct dev_pm_ops arizona_pm_ops = {
 EXPORT_SYMBOL_GPL(arizona_pm_ops);
 
 #ifdef CONFIG_OF
-unsigned long arizona_of_get_type(struct device *dev)
-{
-	const struct of_device_id *id = of_match_device(arizona_of_match, dev);
-
-	if (id)
-		return (unsigned long)id->data;
-	else
-		return 0;
-}
-EXPORT_SYMBOL_GPL(arizona_of_get_type);
-
 static int arizona_of_get_core_pdata(struct arizona *arizona)
 {
 	struct arizona_pdata *pdata = &arizona->pdata;

drivers/mfd/arizona-i2c.c

@@ -23,14 +23,16 @@
 static int arizona_i2c_probe(struct i2c_client *i2c,
 			     const struct i2c_device_id *id)
 {
+	const void *match_data;
 	struct arizona *arizona;
 	const struct regmap_config *regmap_config = NULL;
-	unsigned long type;
+	unsigned long type = 0;
 	int ret;
 
-	if (i2c->dev.of_node)
-		type = arizona_of_get_type(&i2c->dev);
-	else
+	match_data = device_get_match_data(&i2c->dev);
+	if (match_data)
+		type = (unsigned long)match_data;
+	else if (id)
 		type = id->driver_data;
 
 	switch (type) {

drivers/mfd/arizona-spi.c

@@ -23,14 +23,16 @@
 static int arizona_spi_probe(struct spi_device *spi)
 {
 	const struct spi_device_id *id = spi_get_device_id(spi);
+	const void *match_data;
 	struct arizona *arizona;
 	const struct regmap_config *regmap_config = NULL;
-	unsigned long type;
+	unsigned long type = 0;
 	int ret;
 
-	if (spi->dev.of_node)
-		type = arizona_of_get_type(&spi->dev);
-	else
+	match_data = device_get_match_data(&spi->dev);
+	if (match_data)
+		type = (unsigned long)match_data;
+	else if (id)
 		type = id->driver_data;
 
 	switch (type) {

drivers/mfd/arizona.h

@@ -50,13 +50,4 @@ int arizona_dev_exit(struct arizona *arizona);
 int arizona_irq_init(struct arizona *arizona);
 int arizona_irq_exit(struct arizona *arizona);
 
-#ifdef CONFIG_OF
-unsigned long arizona_of_get_type(struct device *dev);
-#else
-static inline unsigned long arizona_of_get_type(struct device *dev)
-{
-	return 0;
-}
-#endif
-
 #endif