pinctrl: stm32: 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: Fabien Dessenne <fabien.dessenne@foss.st.com>

drivers/pinctrl/stm32/pinctrl-stm32.c

@@ -24,6 +24,7 @@
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 #include <linux/slab.h>
@@ -1215,13 +1216,12 @@ static const struct pinconf_ops stm32_pconf_ops = {
 	.pin_config_dbg_show	= stm32_pconf_dbg_show,
 };
 
-static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
-	struct device_node *np)
+static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl, struct fwnode_handle *fwnode)
 {
 	struct stm32_gpio_bank *bank = &pctl->banks[pctl->nbanks];
 	int bank_ioport_nr;
 	struct pinctrl_gpio_range *range = &bank->range;
-	struct of_phandle_args args;
+	struct fwnode_reference_args args;
 	struct device *dev = pctl->dev;
 	struct resource res;
 	int npins = STM32_GPIO_PINS_PER_BANK;
@@ -1230,7 +1230,7 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
 	if (!IS_ERR(bank->rstc))
 		reset_control_deassert(bank->rstc);
 
-	if (of_address_to_resource(np, 0, &res))
+	if (of_address_to_resource(to_of_node(fwnode), 0, &res))
 		return -ENODEV;
 
 	bank->base = devm_ioremap_resource(dev, &res);
@@ -1245,15 +1245,15 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
 
 	bank->gpio_chip = stm32_gpio_template;
 
-	of_property_read_string(np, "st,bank-name", &bank->gpio_chip.label);
+	fwnode_property_read_string(fwnode, "st,bank-name", &bank->gpio_chip.label);
 
-	if (!of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, i, &args)) {
+	if (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, i, &args)) {
 		bank_nr = args.args[1] / STM32_GPIO_PINS_PER_BANK;
 		bank->gpio_chip.base = args.args[1];
 
 		/* get the last defined gpio line (offset + nb of pins) */
 		npins = args.args[0] + args.args[2];
-		while (!of_parse_phandle_with_fixed_args(np, "gpio-ranges", 3, ++i, &args))
+		while (!fwnode_property_get_reference_args(fwnode, "gpio-ranges", NULL, 3, ++i, &args))
 			npins = max(npins, (int)(args.args[0] + args.args[2]));
 	} else {
 		bank_nr = pctl->nbanks;
@@ -1268,20 +1268,20 @@ static int stm32_gpiolib_register_bank(struct stm32_pinctrl *pctl,
 				       &pctl->banks[bank_nr].range);
 	}
 
-	if (of_property_read_u32(np, "st,bank-ioport", &bank_ioport_nr))
+	if (fwnode_property_read_u32(fwnode, "st,bank-ioport", &bank_ioport_nr))
 		bank_ioport_nr = bank_nr;
 
 	bank->gpio_chip.base = bank_nr * STM32_GPIO_PINS_PER_BANK;
 
 	bank->gpio_chip.ngpio = npins;
-	bank->gpio_chip.of_node = np;
+	bank->gpio_chip.fwnode = fwnode;
 	bank->gpio_chip.parent = dev;
 	bank->bank_nr = bank_nr;
 	bank->bank_ioport_nr = bank_ioport_nr;
 	spin_lock_init(&bank->lock);
 
 	/* create irq hierarchical domain */
-	bank->fwnode = of_node_to_fwnode(np);
+	bank->fwnode = fwnode;
 
 	bank->domain = irq_domain_create_hierarchy(pctl->domain, 0,
 					STM32_GPIO_IRQ_LINE, bank->fwnode,
@@ -1418,7 +1418,7 @@ static int stm32_pctrl_create_pins_tab(struct stm32_pinctrl *pctl,
 int stm32_pctl_probe(struct platform_device *pdev)
 {
 	struct device_node *np = pdev->dev.of_node;
-	struct device_node *child;
+	struct fwnode_handle *child;
 	const struct of_device_id *match;
 	struct device *dev = &pdev->dev;
 	struct stm32_pinctrl *pctl;
@@ -1525,40 +1525,34 @@ int stm32_pctl_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	i = 0;
-	for_each_available_child_of_node(np, child) {
+	for_each_gpiochip_node(dev, child) {
 		struct stm32_gpio_bank *bank = &pctl->banks[i];
+		struct device_node *np = to_of_node(child);
 
-		if (of_property_read_bool(child, "gpio-controller")) {
-			bank->rstc = of_reset_control_get_exclusive(child,
-								    NULL);
-			if (PTR_ERR(bank->rstc) == -EPROBE_DEFER) {
-				of_node_put(child);
-				return -EPROBE_DEFER;
-			}
-
-			bank->clk = of_clk_get_by_name(child, NULL);
-			if (IS_ERR(bank->clk)) {
-				if (PTR_ERR(bank->clk) != -EPROBE_DEFER)
-					dev_err(dev,
-						"failed to get clk (%ld)\n",
-						PTR_ERR(bank->clk));
-				of_node_put(child);
-				return PTR_ERR(bank->clk);
-			}
-			i++;
+		bank->rstc = of_reset_control_get_exclusive(np, NULL);
+		if (PTR_ERR(bank->rstc) == -EPROBE_DEFER) {
+			fwnode_handle_put(child);
+			return -EPROBE_DEFER;
 		}
-	}
 
-	for_each_available_child_of_node(np, child) {
-		if (of_property_read_bool(child, "gpio-controller")) {
-			ret = stm32_gpiolib_register_bank(pctl, child);
-			if (ret) {
-				of_node_put(child);
-				return ret;
-			}
+		bank->clk = of_clk_get_by_name(np, NULL);
+		if (IS_ERR(bank->clk)) {
+			if (PTR_ERR(bank->clk) != -EPROBE_DEFER)
+				dev_err(dev, "failed to get clk (%ld)\n", PTR_ERR(bank->clk));
+			fwnode_handle_put(child);
+			return PTR_ERR(bank->clk);
+		}
+		i++;
+	}
 
-			pctl->nbanks++;
+	for_each_gpiochip_node(dev, child) {
+		ret = stm32_gpiolib_register_bank(pctl, child);
+		if (ret) {
+			fwnode_handle_put(child);
+			return ret;
 		}
+
+		pctl->nbanks++;
 	}
 
 	dev_info(dev, "Pinctrl STM32 initialized\n");