pinctrl: renesas: rza1: Switch to use for_each_gpiochip_node() helper

Switch the code to use for_each_gpiochip_node() helper.

While at it, in order to avoid additional churn in the future,
switch to fwnode APIs where it makes sense.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>

drivers/pinctrl/renesas/pinctrl-rza1.c

@@ -24,6 +24,7 @@
 #include <linux/pinctrl/pinconf-generic.h>
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 
 #include "../core.h"
@@ -1161,22 +1162,22 @@ static const struct pinmux_ops rza1_pinmux_ops = {
  * defined by gpio device tree binding documentation.
  *
  * @rza1_pctl: RZ/A1 pin controller device
- * @np: of gpio-controller node
+ * @fwnode: gpio-controller firmware node
  * @chip: gpio chip to register to gpiolib
  * @range: pin range to register to pinctrl core
  */
 static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl,
-			       struct device_node *np,
+			       struct fwnode_handle *fwnode,
 			       struct gpio_chip *chip,
 			       struct pinctrl_gpio_range *range)
 {
 	const char *list_name = "gpio-ranges";
-	struct of_phandle_args of_args;
+	struct fwnode_reference_args args;
 	unsigned int gpioport;
 	u32 pinctrl_base;
 	int ret;
 
-	ret = of_parse_phandle_with_fixed_args(np, list_name, 3, 0, &of_args);
+	ret = fwnode_property_get_reference_args(fwnode, list_name, NULL, 3, 0, &args);
 	if (ret) {
 		dev_err(rza1_pctl->dev, "Unable to parse %s list property\n",
 			list_name);
@@ -1187,7 +1188,7 @@ static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl,
 	 * Find out on which port this gpio-chip maps to by inspecting the
 	 * second argument of the "gpio-ranges" property.
 	 */
-	pinctrl_base = of_args.args[1];
+	pinctrl_base = args.args[1];
 	gpioport = RZA1_PIN_ID_TO_PORT(pinctrl_base);
 	if (gpioport >= RZA1_NPORTS) {
 		dev_err(rza1_pctl->dev,
@@ -1197,19 +1198,18 @@ static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl,
 
 	*chip		= rza1_gpiochip_template;
 	chip->base	= -1;
-	chip->label	= devm_kasprintf(rza1_pctl->dev, GFP_KERNEL, "%pOFn",
-					 np);
+	chip->ngpio	= args.args[2];
+	chip->label	= devm_kasprintf(rza1_pctl->dev, GFP_KERNEL, "%pfwP", fwnode);
 	if (!chip->label)
 		return -ENOMEM;
 
-	chip->ngpio	= of_args.args[2];
-	chip->of_node	= np;
+	chip->fwnode	= fwnode;
 	chip->parent	= rza1_pctl->dev;
 
 	range->id	= gpioport;
 	range->name	= chip->label;
 	range->pin_base	= range->base = pinctrl_base;
-	range->npins	= of_args.args[2];
+	range->npins	= args.args[2];
 	range->gc	= chip;
 
 	ret = devm_gpiochip_add_data(rza1_pctl->dev, chip,
@@ -1232,10 +1232,9 @@ static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl,
  */
 static int rza1_gpio_register(struct rza1_pinctrl *rza1_pctl)
 {
-	struct device_node *np = rza1_pctl->dev->of_node;
 	struct pinctrl_gpio_range *gpio_ranges;
 	struct gpio_chip *gpio_chips;
-	struct device_node *child;
+	struct fwnode_handle *child;
 	unsigned int ngpiochips;
 	unsigned int i;
 	int ret;
@@ -1254,14 +1253,11 @@ static int rza1_gpio_register(struct rza1_pinctrl *rza1_pctl)
 		return -ENOMEM;
 
 	i = 0;
-	for_each_child_of_node(np, child) {
-		if (!of_property_read_bool(child, "gpio-controller"))
-			continue;
-
+	for_each_gpiochip_node(rza1_pctl->dev, child) {
 		ret = rza1_parse_gpiochip(rza1_pctl, child, &gpio_chips[i],
 					  &gpio_ranges[i]);
 		if (ret) {
-			of_node_put(child);
+			fwnode_handle_put(child);
 			return ret;
 		}