powerpc/wii.dts: Add drive slot LED

The Wii has a blue LED in the disk drive slot, which is controlled via a
GPIO line. Add this LED to wii.dts, and mark it as a panic-indicator.
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/boot/dts/wii.dts

@@ -13,6 +13,7 @@
  */
 
 /dts-v1/;
+#include <dt-bindings/gpio/gpio.h>
 
 /*
  * This is commented-out for now.
@@ -223,5 +224,16 @@ disk@d806000 {
 			interrupts = <2>;
 		};
 	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		/* This is the blue LED in the disk drive slot */
+		drive-slot {
+			label = "wii:blue:drive_slot";
+			gpios = <&GPIO 5 GPIO_ACTIVE_HIGH>;
+			panic-indicator;
+		};
+	};
 };