leds: gpio: Configure per-LED pin control

Each gpio-leds DT node DT subnode can have a pinctrl property assigned
to it, parse the DT subnode pinctrl properties and configure each pin
accordingly.
Tested-by: Christoph Niedermaier <cniedermaier@dh-electronics.com>
Signed-off-by: Marek Vasut <marex@denx.de>
Link: https://lore.kernel.org/r/20230523183151.5460-1-marex@denx.deSigned-off-by: Lee Jones <lee@kernel.org>

drivers/leds/leds-gpio.c

@@ -13,6 +13,7 @@
 #include <linux/leds.h>
 #include <linux/module.h>
 #include <linux/of.h>
+#include <linux/pinctrl/consumer.h>
 #include <linux/platform_device.h>
 #include <linux/property.h>
 #include <linux/slab.h>
@@ -77,6 +78,7 @@ static int create_gpio_led(const struct gpio_led *template,
 	struct fwnode_handle *fwnode, gpio_blink_set_t blink_set)
 {
 	struct led_init_data init_data = {};
+	struct pinctrl *pinctrl;
 	int ret, state;
 
 	led_dat->cdev.default_trigger = template->default_trigger;
@@ -119,6 +121,22 @@ static int create_gpio_led(const struct gpio_led *template,
 						     &init_data);
 	}
 
+	if (ret)
+		return ret;
+
+	pinctrl = devm_pinctrl_get_select_default(led_dat->cdev.dev);
+	if (IS_ERR(pinctrl)) {
+		ret = PTR_ERR(pinctrl);
+		if (ret != -ENODEV) {
+			dev_warn(led_dat->cdev.dev,
+				 "Failed to select %pOF pinctrl: %d\n",
+				 to_of_node(fwnode), ret);
+		} else {
+			/* pinctrl-%d not present, not an error */
+			ret = 0;
+		}
+	}
+
 	return ret;
 }