powerpc/83xx: Add MCU LEDs support for MPC837xRDB and MPC8315RDB boards

There are two front-panel LEDs on MPC837xRDB and MPC8315RDB boards: PWR
and HDD. After adding appropriate nodes we can program these LEDs from
kernel and user space.
Signed-off-by: Anton Vorontsov <avorontsov@mvista.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/boot/dts/mpc8315erdb.dts

@@ -463,4 +463,18 @@ pcie@0 {
 				  0 0x00800000>;
 		};
 	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pwr {
+			gpios = <&mcu_pio 0 0>;
+			default-state = "on";
+		};
+
+		hdd {
+			gpios = <&mcu_pio 1 0>;
+			linux,default-trigger = "ide-disk";
+		};
+	};
 };

arch/powerpc/boot/dts/mpc8377_rdb.dts

@@ -486,4 +486,18 @@ pcie@0 {
 				  0 0x00800000>;
 		};
 	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pwr {
+			gpios = <&mcu_pio 0 0>;
+			default-state = "on";
+		};
+
+		hdd {
+			gpios = <&mcu_pio 1 0>;
+			linux,default-trigger = "ide-disk";
+		};
+	};
 };

arch/powerpc/boot/dts/mpc8378_rdb.dts

@@ -470,4 +470,18 @@ pcie@0 {
 				  0 0x00800000>;
 		};
 	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pwr {
+			gpios = <&mcu_pio 0 0>;
+			default-state = "on";
+		};
+
+		hdd {
+			gpios = <&mcu_pio 1 0>;
+			linux,default-trigger = "ide-disk";
+		};
+	};
 };

arch/powerpc/boot/dts/mpc8379_rdb.dts

@@ -436,4 +436,18 @@ pci0: pci@e0008500 {
 		compatible = "fsl,mpc8349-pci";
 		device_type = "pci";
 	};
+
+	leds {
+		compatible = "gpio-leds";
+
+		pwr {
+			gpios = <&mcu_pio 0 0>;
+			default-state = "on";
+		};
+
+		hdd {
+			gpios = <&mcu_pio 1 0>;
+			linux,default-trigger = "ide-disk";
+		};
+	};
 };

arch/powerpc/platforms/83xx/mpc831x_rdb.c

@@ -74,6 +74,7 @@ static int __init mpc831x_rdb_probe(void)
 static struct of_device_id __initdata of_bus_ids[] = {
 	{ .compatible = "simple-bus" },
 	{ .compatible = "gianfar" },
+	{ .compatible = "gpio-leds", },
 	{},
 };
 

arch/powerpc/platforms/83xx/mpc837x_rdb.c

@@ -72,6 +72,7 @@ static struct of_device_id mpc837x_ids[] = {
 	{ .compatible = "soc", },
 	{ .compatible = "simple-bus", },
 	{ .compatible = "gianfar", },
+	{ .compatible = "gpio-leds", },
 	{},
 };