pinctrl: npcm7xx: 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,
do the following:
- use a temporary variable for struct device pointer to shorten a few lines
- get rid of a temporary variable for vIRQ number, assign it directly
- switch to fwnode APIs where it makes sense

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

drivers/pinctrl/nuvoton/pinctrl-npcm7xx.c

@@ -17,6 +17,7 @@
 #include <linux/pinctrl/pinctrl.h>
 #include <linux/pinctrl/pinmux.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 #include <linux/regmap.h>
 
 /* GCR registers */
@@ -1862,85 +1863,66 @@ static int npcm7xx_gpio_of(struct npcm7xx_pinctrl *pctrl)
 {
 	int ret = -ENXIO;
 	struct resource res;
-	int id = 0, irq;
+	struct device *dev = pctrl->dev;
-	struct device_node *np;
+	struct fwnode_reference_args args;
-	struct of_phandle_args pinspec;
+	struct fwnode_handle *child;
+	int id = 0;
+
+	for_each_gpiochip_node(dev, child) {
+		struct device_node *np = to_of_node(child);
 
-	for_each_available_child_of_node(pctrl->dev->of_node, np)
-		if (of_find_property(np, "gpio-controller", NULL)) {
 		ret = of_address_to_resource(np, 0, &res);
 		if (ret < 0) {
-				dev_err(pctrl->dev,
+			dev_err(dev, "Resource fail for GPIO bank %u\n", id);
-					"Resource fail for GPIO bank %u\n", id);
 			return ret;
 		}
 
-			pctrl->gpio_bank[id].base =
+		pctrl->gpio_bank[id].base = ioremap(res.start, resource_size(&res));
-				ioremap(res.start, resource_size(&res));
 
-			irq = irq_of_parse_and_map(np, 0);
+		ret = bgpio_init(&pctrl->gpio_bank[id].gc, dev, 4,
-			if (irq < 0) {
+				 pctrl->gpio_bank[id].base + NPCM7XX_GP_N_DIN,
-				dev_err(pctrl->dev,
+				 pctrl->gpio_bank[id].base + NPCM7XX_GP_N_DOUT,
-					"No IRQ for GPIO bank %u\n", id);
-				ret = irq;
-				return ret;
-			}
-
-			ret = bgpio_init(&pctrl->gpio_bank[id].gc,
-					 pctrl->dev, 4,
-					 pctrl->gpio_bank[id].base +
-					 NPCM7XX_GP_N_DIN,
-					 pctrl->gpio_bank[id].base +
-					 NPCM7XX_GP_N_DOUT,
 				 NULL,
 				 NULL,
-					 pctrl->gpio_bank[id].base +
+				 pctrl->gpio_bank[id].base + NPCM7XX_GP_N_IEM,
-					 NPCM7XX_GP_N_IEM,
 				 BGPIOF_READ_OUTPUT_REG_SET);
 		if (ret) {
-				dev_err(pctrl->dev, "bgpio_init() failed\n");
+			dev_err(dev, "bgpio_init() failed\n");
 			return ret;
 		}
 
-			ret = of_parse_phandle_with_fixed_args(np,
+		ret = fwnode_property_get_reference_args(child, "gpio-ranges", NULL, 3, 0, &args);
-							       "gpio-ranges", 3,
-							       0, &pinspec);
 		if (ret < 0) {
-				dev_err(pctrl->dev,
+			dev_err(dev, "gpio-ranges fail for GPIO bank %u\n", id);
-					"gpio-ranges fail for GPIO bank %u\n",
-					id);
 			return ret;
 		}
 
-			pctrl->gpio_bank[id].irq = irq;
+		ret = irq_of_parse_and_map(np, 0);
+		if (ret < 0) {
+			dev_err(dev, "No IRQ for GPIO bank %u\n", id);
+			return ret;
+		}
+		pctrl->gpio_bank[id].irq = ret;
 		pctrl->gpio_bank[id].irq_chip = npcmgpio_irqchip;
-			pctrl->gpio_bank[id].gc.parent = pctrl->dev;
+		pctrl->gpio_bank[id].irqbase = id * NPCM7XX_GPIO_PER_BANK;
-			pctrl->gpio_bank[id].irqbase =
+		pctrl->gpio_bank[id].pinctrl_id = args.args[0];
-				id * NPCM7XX_GPIO_PER_BANK;
+		pctrl->gpio_bank[id].gc.base = args.args[1];
-			pctrl->gpio_bank[id].pinctrl_id = pinspec.args[0];
+		pctrl->gpio_bank[id].gc.ngpio = args.args[2];
-			pctrl->gpio_bank[id].gc.base = pinspec.args[1];
-			pctrl->gpio_bank[id].gc.ngpio = pinspec.args[2];
 		pctrl->gpio_bank[id].gc.owner = THIS_MODULE;
-			pctrl->gpio_bank[id].gc.label =
+		pctrl->gpio_bank[id].gc.parent = dev;
-				devm_kasprintf(pctrl->dev, GFP_KERNEL, "%pOF",
+		pctrl->gpio_bank[id].gc.fwnode = child;
-					       np);
+		pctrl->gpio_bank[id].gc.label = devm_kasprintf(dev, GFP_KERNEL, "%pfw", child);
 		if (pctrl->gpio_bank[id].gc.label == NULL)
 			return -ENOMEM;
 
 		pctrl->gpio_bank[id].gc.dbg_show = npcmgpio_dbg_show;
-			pctrl->gpio_bank[id].direction_input =
+		pctrl->gpio_bank[id].direction_input = pctrl->gpio_bank[id].gc.direction_input;
-				pctrl->gpio_bank[id].gc.direction_input;
+		pctrl->gpio_bank[id].gc.direction_input = npcmgpio_direction_input;
-			pctrl->gpio_bank[id].gc.direction_input =
+		pctrl->gpio_bank[id].direction_output = pctrl->gpio_bank[id].gc.direction_output;
-				npcmgpio_direction_input;
+		pctrl->gpio_bank[id].gc.direction_output = npcmgpio_direction_output;
-			pctrl->gpio_bank[id].direction_output =
+		pctrl->gpio_bank[id].request = pctrl->gpio_bank[id].gc.request;
-				pctrl->gpio_bank[id].gc.direction_output;
-			pctrl->gpio_bank[id].gc.direction_output =
-				npcmgpio_direction_output;
-			pctrl->gpio_bank[id].request =
-				pctrl->gpio_bank[id].gc.request;
 		pctrl->gpio_bank[id].gc.request = npcmgpio_gpio_request;
 		pctrl->gpio_bank[id].gc.free = npcmgpio_gpio_free;
-			pctrl->gpio_bank[id].gc.of_node = np;
 		id++;
 	}