ARM: dts: dove: add DT GPU support

Add DT support for the Vivante GC600 GPU on Marvell Dove platforms.
These nodes default to being disabled unless a platform decides they
should be enabled.

Signed-off-by: Russell King <[e-mail]>
Signed-off-by: Lucas Stach <[e-mail]>
Signed-off-by: Gregory CLEMENT <[e-mail]>

arch/arm/boot/dts/dove.dtsi

···
 		marvell,tauros2-cache-features = <0>;
 	};
 
+	gpu-subsystem {
+		compatible = "marvell,dove-gpu-subsystem";
+		cores = <&gpu>;
+		status = "disabled";
+	};
+
 	i2c-mux {
 		compatible = "i2c-mux-pinctrl";
 		#address-cells = <1>;
···
 				clocks = <&gate_clk 15>;
 				#address-cells = <1>;
 				#size-cells = <1>;
+			};
+
+			gpu: gpu@840000 {
+				clocks = <&divider_clk 1>;
+				clock-names = "core";
+				compatible = "vivante,gc";
+				interrupts = <48>;
+				power-domains = <&gpu_domain>;
+				reg = <0x840000 0x4000>;
+				status = "disabled";
 			};
 		};
 	};