ARM: dts: rockchip: add gpio alias for gpio dt nodes

Rockchip SoC TRM, SoC datasheet and board schematics always refer to
the same gpio numbers - even if not all are used for a specific board.
In order to not have to re-define them for every board add the
aliases to SoC dtsi files.

Co-developed-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Jianqun Xu <jay.xu@rock-chips.com>
Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Link: https://lore.kernel.org/r/89f2a229-9f14-d43f-c53d-5d4688e70456@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

Author: Johan Jonker

arch/arm/boot/dts/rockchip/rk3036.dtsi

@@ -17,6 +17,9 @@
 	interrupt-parent = <&gic>;
 
 	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;

arch/arm/boot/dts/rockchip/rk3066a.dtsi

@@ -13,6 +13,11 @@
 / {
 	compatible = "rockchip,rk3066a";
 
+	aliases {
+		gpio4 = &gpio4;
+		gpio6 = &gpio6;
+	};
+
 	cpus {
 		#address-cells = <1>;
 		#size-cells = <0>;

arch/arm/boot/dts/rockchip/rk322x.dtsi

@@ -15,6 +15,10 @@
 	interrupt-parent = <&gic>;
 
 	aliases {
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
 		serial0 = &uart0;
 		serial1 = &uart1;
 		serial2 = &uart2;

arch/arm/boot/dts/rockchip/rk3288.dtsi

@@ -19,6 +19,15 @@
 
 	aliases {
 		ethernet0 = &gmac;
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
+		gpio4 = &gpio4;
+		gpio5 = &gpio5;
+		gpio6 = &gpio6;
+		gpio7 = &gpio7;
+		gpio8 = &gpio8;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;

arch/arm/boot/dts/rockchip/rk3xxx.dtsi

@@ -16,6 +16,10 @@
 
 	aliases {
 		ethernet0 = &emac;
+		gpio0 = &gpio0;
+		gpio1 = &gpio1;
+		gpio2 = &gpio2;
+		gpio3 = &gpio3;
 		i2c0 = &i2c0;
 		i2c1 = &i2c1;
 		i2c2 = &i2c2;