ARM: dts: rockchip: Add GPU node for RK3128

RK3128 SoCs have Mali400 MP2 GPU.
Add the respective device tree node and the correspondending opp-table.

The frequencies and voltages of the opp-table have been taken from
downstream kernel.
Signed-off-by: Alex Bee <knaerzche@gmail.com>
Link: https://lore.kernel.org/r/20231204153547.97877-3-knaerzche@gmail.comSigned-off-by: Heiko Stuebner <heiko@sntech.de>

arch/arm/boot/dts/rockchip/rk3128.dtsi

@@ -101,6 +101,27 @@ opp-1200000000 {
 		};
 	};
 
+	gpu_opp_table: opp-table-1 {
+		compatible = "operating-points-v2";
+
+		opp-200000000 {
+			opp-hz = /bits/ 64 <200000000>;
+			opp-microvolt = <975000 975000 1250000>;
+		};
+		opp-300000000 {
+			opp-hz = /bits/ 64 <300000000>;
+			opp-microvolt = <1050000 1050000 1250000>;
+		};
+		opp-400000000 {
+			opp-hz = /bits/ 64 <400000000>;
+			opp-microvolt = <1150000 1150000 1250000>;
+		};
+		opp-480000000 {
+			opp-hz = /bits/ 64 <480000000>;
+			opp-microvolt = <1250000 1250000 1250000>;
+		};
+	};
+
 	timer {
 		compatible = "arm,armv7-timer";
 		interrupts = <GIC_PPI 13 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_HIGH)>,
@@ -131,6 +152,29 @@ smp-sram@0 {
 		};
 	};
 
+	gpu: gpu@10090000 {
+		compatible = "rockchip,rk3128-mali", "arm,mali-400";
+		reg = <0x10090000 0x10000>;
+		interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 4 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "gp",
+				  "gpmmu",
+				  "pp0",
+				  "ppmmu0",
+				  "pp1",
+				  "ppmmu1";
+		clocks = <&cru ACLK_GPU>, <&cru ACLK_GPU>;
+		clock-names = "bus", "core";
+		operating-points-v2 = <&gpu_opp_table>;
+		resets = <&cru SRST_GPU>;
+		power-domains = <&power RK3128_PD_GPU>;
+		status = "disabled";
+	};
+
 	pmu: syscon@100a0000 {
 		compatible = "rockchip,rk3128-pmu", "syscon", "simple-mfd";
 		reg = <0x100a0000 0x1000>;