ARM: dts: imx6sx: Add GPU bindings

Add bindings for the Vivante GC400T GPU found in the i.MX6SX.
Signed-off-by: NMarek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Reviewed-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm/boot/dts/imx6sx.dtsi

@@ -159,6 +159,16 @@
 			arm,data-latency = <4 2 3>;
 		};
 
+		gpu: gpu@01800000 {
+			compatible = "vivante,gc";
+			reg = <0x01800000 0x4000>;
+			interrupts = <GIC_SPI 10 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clks IMX6SX_CLK_GPU>,
+				 <&clks IMX6SX_CLK_GPU>,
+				 <&clks IMX6SX_CLK_GPU>;
+			clock-names = "bus", "core", "shader";
+		};
+
 		dma_apbh: dma-apbh@01804000 {
 			compatible = "fsl,imx6sx-dma-apbh", "fsl,imx28-dma-apbh";
 			reg = <0x01804000 0x2000>;
@@ -1273,4 +1283,9 @@
 			status = "disabled";
 		};
 	};
+
+	gpu-subsystem {
+		compatible = "fsl,imx-gpu-subsystem";
+		cores = <&gpu>;
+	};
 };