[PATCH V3 5/5] arm64: dts: imx8mn: Add GPU node

[Adam Ford]

According to the documentation from NXP, the i.MX8M Nano has a
Vivante GC7000 Ultra Lite as its GPU core.

With this patch, the Etnaviv driver presents the GPU as:
   etnaviv-gpu 38000000.gpu: model: GC7000, revision: 6203

The stock operating voltage for the i.MX8M Nano is .85V which means
the GPU needs to run at 400MHz.  For boards where the operating
voltage is higher, this can be increased.

Signed-off-by: Adam Ford <aford173 at gmail.com>
---
V3:  Rebase on series starting https://lkml.org/lkml/2021/4/29/72
V2:  Move into this series
     Update clocking description

diff --git a/arch/arm64/boot/dts/freescale/imx8mn.dtsi b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
index a2ca25aa8eb6..07a8ff58d44c 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn.dtsi
@@ -1040,6 +1040,31 @@ gpmi: nand-controller at 33002000 {
 			status = "disabled";
 		};
 
+		gpu: gpu at 38000000 {
+			compatible = "vivante,gc";
+			reg = <0x38000000 0x8000>;
+			interrupts = <GIC_SPI 3 IRQ_TYPE_LEVEL_HIGH>;
+			clocks = <&clk IMX8MN_CLK_GPU_AHB>,
+				<&clk IMX8MN_CLK_GPU_BUS_ROOT>,
+				<&clk IMX8MN_CLK_GPU_CORE_ROOT>,
+				<&clk IMX8MN_CLK_GPU_SHADER_DIV>;
+			clock-names = "reg", "bus", "core", "shader";
+			assigned-clocks = <&clk IMX8MN_CLK_GPU_CORE_SRC>,
+					  <&clk IMX8MN_CLK_GPU_SHADER_SRC>,
+					  <&clk IMX8MN_CLK_GPU_AXI>,
+					  <&clk IMX8MN_CLK_GPU_AHB>,
+					  <&clk IMX8MN_GPU_PLL>,
+					  <&clk IMX8MN_CLK_GPU_CORE_DIV>,
+					  <&clk IMX8MN_CLK_GPU_SHADER_DIV>;
+			assigned-clock-parents = <&clk IMX8MN_GPU_PLL_OUT>,
+						  <&clk IMX8MN_GPU_PLL_OUT>,
+						  <&clk IMX8MN_SYS_PLL1_800M>,
+						  <&clk IMX8MN_SYS_PLL1_800M>;
+			assigned-clock-rates = <0>, <0>, <800000000>, <400000000>, <1200000000>,
+				<400000000>, <400000000>;
+			power-domains = <&pgc_gpumix>;
+		};
+
 		gic: interrupt-controller at 38800000 {
 			compatible = "arm,gic-v3";
 			reg = <0x38800000 0x10000>,
-- 
2.25.1