mips: dts: ralink: mt7621: add GB-PC2 LEDs

Add the missing LEDs for GB-PC2. The ethblack-green, ethblue-green, power
and system LEDs weren't added previously, because they don't exist on the
device schematics. Tests on a GB-PC2 by me and Petr proved otherwise.

The i2c bus cannot be used on GB-PC2 as its pins are wired to LEDs instead,
and GB-PC1 does not use it. Therefore, do not enable it on both devices.

Link: https://github.com/ngiger/GnuBee_Docs/blob/master/GB-PCx/Documents/GB-PC2_V1.1_schematic.pdf
Tested-by: Petr Louda <petr.louda@outlook.cz>
Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
Reviewed-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

arch/mips/boot/dts/ralink/mt7621-gnubee-gb-pc1.dts

@@ -20,12 +20,6 @@
 		bootargs = "console=ttyS0,57600";
 	};
 
-	palmbus: palmbus@1e000000 {
-		i2c@900 {
-			status = "okay";
-		};
-	};
-
 	gpio-keys {
 		compatible = "gpio-keys";
 

arch/mips/boot/dts/ralink/mt7621-gnubee-gb-pc2.dts

@@ -20,12 +20,6 @@
 		bootargs = "console=ttyS0,57600";
 	};
 
-	palmbus: palmbus@1e000000 {
-		i2c@900 {
-			status = "okay";
-		};
-	};
-
 	gpio-keys {
 		compatible = "gpio-keys";
 
@@ -35,6 +29,42 @@
 			linux,code = <KEY_RESTART>;
 		};
 	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		ethblack-green {
+			label = "green:ethblack";
+			gpios = <&gpio 3 GPIO_ACTIVE_LOW>;
+		};
+
+		ethblue-green {
+			label = "green:ethblue";
+			gpios = <&gpio 4 GPIO_ACTIVE_LOW>;
+		};
+
+		ethyellow-green {
+			label = "green:ethyellow";
+			gpios = <&gpio 15 GPIO_ACTIVE_LOW>;
+		};
+
+		ethyellow-orange {
+			label = "orange:ethyellow";
+			gpios = <&gpio 13 GPIO_ACTIVE_LOW>;
+		};
+
+		power {
+			label = "green:power";
+			gpios = <&gpio 6 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "default-on";
+		};
+
+		system {
+			label = "green:system";
+			gpios = <&gpio 8 GPIO_ACTIVE_LOW>;
+			linux,default-trigger = "disk-activity";
+		};
+	};
 };
 
 &mmc {