dt-bindings: leds: Convert gpio-leds to DT schema

Convert the gpio-leds binding to DT schema format.

Drop the last example as the node name collides when built, and it doesn't
add much value.

Cc: Pavel Machek <pavel@ucw.cz>
Cc: Dan Murphy <dmurphy@ti.com>
Acked-by: NJacek Anaszewski <jacek.anaszewski@gmail.com>
Signed-off-by: NRob Herring <robh@kernel.org>

Documentation/devicetree/bindings/leds/leds-gpio.txt

-LEDs connected to GPIO lines
-
-Required properties:
-- compatible : should be "gpio-leds".
-
-Each LED is represented as a sub-node of the gpio-leds device.  Each
-node's name represents the name of the corresponding LED.
-
-LED sub-node properties:
-- gpios :  Should specify the LED's GPIO, see "gpios property" in
-  Documentation/devicetree/bindings/gpio/gpio.txt.  Active low LEDs should be
-  indicated using flags in the GPIO specifier.
-- function :  (optional)
-  see Documentation/devicetree/bindings/leds/common.txt
-- color :  (optional)
-  see Documentation/devicetree/bindings/leds/common.txt
-- label :  (optional)
-  see Documentation/devicetree/bindings/leds/common.txt (deprecated)
-- linux,default-trigger :  (optional)
-  see Documentation/devicetree/bindings/leds/common.txt
-- default-state:  (optional) The initial state of the LED.
-  see Documentation/devicetree/bindings/leds/common.txt
-- retain-state-suspended: (optional) The suspend state can be retained.Such
-  as charge-led gpio.
-- retain-state-shutdown: (optional) Retain the state of the LED on shutdown.
-  Useful in BMC systems, for example when the BMC is rebooted while the host
-  remains up.
-- panic-indicator : (optional)
-  see Documentation/devicetree/bindings/leds/common.txt
-
-Examples:
-
-#include <dt-bindings/gpio/gpio.h>
-#include <dt-bindings/leds/common.h>
-
-leds {
-	compatible = "gpio-leds";
-	led0 {
-		gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>;
-		linux,default-trigger = "disk-activity";
-		function = LED_FUNCTION_DISK;
-	};
-
-	led1 {
-		gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
-		/* Keep LED on if BIOS detected hardware fault */
-		default-state = "keep";
-		function = LED_FUNCTION_FAULT;
-	};
-};
-
-run-control {
-	compatible = "gpio-leds";
-	led0 {
-		gpios = <&mpc8572 6 GPIO_ACTIVE_HIGH>;
-		color = <LED_COLOR_ID_RED>;
-		default-state = "off";
-	};
-	led1 {
-		gpios = <&mpc8572 7 GPIO_ACTIVE_HIGH>;
-		color = <LED_COLOR_ID_GREEN>;
-		default-state = "on";
-	};
-};
-
-leds {
-	compatible = "gpio-leds";
-
-	led0 {
-		gpios = <&gpio1 2 GPIO_ACTIVE_HIGH>;
-		linux,default-trigger = "max8903-charger-charging";
-		retain-state-suspended;
-		function = LED_FUNCTION_CHARGE;
-	};
-};

Documentation/devicetree/bindings/leds/leds-gpio.yaml

+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/leds/leds-gpio.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: LEDs connected to GPIO lines
+
+maintainers:
+  - Jacek Anaszewski <jacek.anaszewski@gmail.com>
+  - Pavel Machek <pavel@ucw.cz>
+
+description:
+  Each LED is represented as a sub-node of the gpio-leds device.  Each
+  node's name represents the name of the corresponding LED.
+
+properties:
+  compatible:
+    const: gpio-leds
+
+patternProperties:
+  # The first form is preferred, but fall back to just 'led' anywhere in the
+  # node name to at least catch some child nodes.
+  "(^led-[0-9a-f]$|led)":
+    type: object
+
+    allOf:
+      - $ref: common.yaml#
+
+    properties:
+      gpios:
+        maxItems: 1
+
+      retain-state-suspended:
+        description:
+          The suspend state can be retained.Such as charge-led gpio.
+        type: boolean
+
+      retain-state-shutdown:
+        description:
+          Retain the state of the LED on shutdown. Useful in BMC systems, for
+          example when the BMC is rebooted while the host remains up.
+        type: boolean
+
+    required:
+      - gpios
+
+additionalProperties: false
+
+examples:
+  - |
+
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/leds/common.h>
+
+    leds {
+        compatible = "gpio-leds";
+        led-0 {
+            gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>;
+            linux,default-trigger = "disk-activity";
+            function = LED_FUNCTION_DISK;
+        };
+
+        led-1 {
+            gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
+            /* Keep LED on if BIOS detected hardware fault */
+            default-state = "keep";
+            function = LED_FUNCTION_FAULT;
+        };
+    };
+
+    run-control {
+        compatible = "gpio-leds";
+        led-0 {
+            gpios = <&mpc8572 6 GPIO_ACTIVE_HIGH>;
+            color = <LED_COLOR_ID_RED>;
+            default-state = "off";
+        };
+        led-1 {
+            gpios = <&mpc8572 7 GPIO_ACTIVE_HIGH>;
+            color = <LED_COLOR_ID_GREEN>;
+            default-state = "on";
+        };
+    };
+
+...