regmap: Switch to use fwnode instead of OF one

Make regmap firmware node type agnostic by switching it to use fwnode.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20200708161232.17914-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/base/regmap/regmap.c

@@ -11,7 +11,7 @@
 #include <linux/export.h>
 #include <linux/mutex.h>
 #include <linux/err.h>
-#include <linux/of.h>
+#include <linux/property.h>
 #include <linux/rbtree.h>
 #include <linux/sched.h>
 #include <linux/delay.h>
@@ -631,7 +631,7 @@ enum regmap_endian regmap_get_val_endian(struct device *dev,
 					 const struct regmap_bus *bus,
 					 const struct regmap_config *config)
 {
-	struct device_node *np;
+	struct fwnode_handle *fwnode = dev ? dev_fwnode(dev) : NULL;
 	enum regmap_endian endian;
 
 	/* Retrieve the endianness specification from the regmap config */
@@ -641,22 +641,17 @@ enum regmap_endian regmap_get_val_endian(struct device *dev,
 	if (endian != REGMAP_ENDIAN_DEFAULT)
 		return endian;
 
-	/* If the dev and dev->of_node exist try to get endianness from DT */
-	if (dev && dev->of_node) {
-		np = dev->of_node;
-
-		/* Parse the device's DT node for an endianness specification */
-		if (of_property_read_bool(np, "big-endian"))
+	/* If the firmware node exist try to get endianness from it */
+	if (fwnode_property_read_bool(fwnode, "big-endian"))
 		endian = REGMAP_ENDIAN_BIG;
-		else if (of_property_read_bool(np, "little-endian"))
+	else if (fwnode_property_read_bool(fwnode, "little-endian"))
 		endian = REGMAP_ENDIAN_LITTLE;
-		else if (of_property_read_bool(np, "native-endian"))
+	else if (fwnode_property_read_bool(fwnode, "native-endian"))
 		endian = REGMAP_ENDIAN_NATIVE;
 
-		/* If the endianness was specified in DT, use that */
+	/* If the endianness was specified in fwnode, use that */
 	if (endian != REGMAP_ENDIAN_DEFAULT)
 		return endian;
-	}
 
 	/* Retrieve the endianness specification from the bus config */
 	if (bus && bus->val_format_endian_default)