regmap: Switch to use fwnode instead of OF one

#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>

					 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 */

	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)