arm64: tegra: Enable GM20B GPU on Tegra210

Complement the GM20B GPU device tree node on Tegra210 with missing
 properties to make it usable.
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Merge tag 'tegra-for-4.7-gm20b' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux into next/dt64

Merge "arm64: tegra: Enable GM20B GPU on Tegra210" from Thierry Reding:

Complement the GM20B GPU device tree node on Tegra210 with missing
properties to make it usable.

* tag 'tegra-for-4.7-gm20b' of git://git.kernel.org/pub/scm/linux/kernel/git/tegra/linux:
  arm64: tegra: Add IOMMU node to GM20B on Tegra210
  arm64: tegra: Add reference clock to GM20B on Tegra210
  dt-bindings: Add documentation for GM20B GPU
  dt-bindings: gk20a: Document iommus property
  dt-bindings: gk20a: Fix typo in compatible name

Documentation/devicetree/bindings/gpu/nvidia,gk20a.txt

@@ -1,9 +1,10 @@
-NVIDIA GK20A Graphics Processing Unit
+NVIDIA Tegra Graphics Processing Units
 
 Required properties:
-- compatible: "nvidia,<chip>-<gpu>"
+- compatible: "nvidia,<gpu>"
   Currently recognized values:
-  - nvidia,tegra124-gk20a
+  - nvidia,gk20a
+  - nvidia,gm20b
 - reg: Physical base address and length of the controller's registers.
   Must contain two entries:
   - first entry for bar0
@@ -19,14 +20,20 @@ Required properties:
 - clock-names: Must include the following entries:
   - gpu
   - pwr
+If the compatible string is "nvidia,gm20b", then the following clock
+is also required:
+  - ref
 - resets: Must contain an entry for each entry in reset-names.
   See ../reset/reset.txt for details.
 - reset-names: Must include the following entries:
   - gpu
 
-Example:
+Optional properties:
+- iommus: A reference to the IOMMU. See ../iommu/iommu.txt for details.
 
-	gpu@0,57000000 {
+Example for GK20A:
+
+	gpu@57000000 {
 		compatible = "nvidia,gk20a";
 		reg = <0x0 0x57000000 0x0 0x01000000>,
 		      <0x0 0x58000000 0x0 0x01000000>;
@@ -39,5 +46,25 @@ Example:
 		clock-names = "gpu", "pwr";
 		resets = <&tegra_car 184>;
 		reset-names = "gpu";
+		iommus = <&mc TEGRA_SWGROUP_GPU>;
+		status = "disabled";
+	};
+
+Example for GM20B:
+
+	gpu@57000000 {
+		compatible = "nvidia,gm20b";
+		reg = <0x0 0x57000000 0x0 0x01000000>,
+		      <0x0 0x58000000 0x0 0x01000000>;
+		interrupts = <GIC_SPI 157 IRQ_TYPE_LEVEL_HIGH>,
+			     <GIC_SPI 158 IRQ_TYPE_LEVEL_HIGH>;
+		interrupt-names = "stall", "nonstall";
+		clocks = <&tegra_car TEGRA210_CLK_GPU>,
+			 <&tegra_car TEGRA210_CLK_PLL_P_OUT5>,
+			 <&tegra_car TEGRA210_CLK_PLL_G_REF>;
+		clock-names = "gpu", "pwr", "ref";
+		resets = <&tegra_car 184>;
+		reset-names = "gpu";
+		iommus = <&mc TEGRA_SWGROUP_GPU>;
 		status = "disabled";
 	};

arch/arm64/boot/dts/nvidia/tegra210.dtsi

@@ -226,10 +226,14 @@ gpu@57000000 {
 			     <GIC_SPI 158 IRQ_TYPE_LEVEL_HIGH>;
 		interrupt-names = "stall", "nonstall";
 		clocks = <&tegra_car TEGRA210_CLK_GPU>,
-			 <&tegra_car TEGRA210_CLK_PLL_P_OUT5>;
-		clock-names = "gpu", "pwr";
+			 <&tegra_car TEGRA210_CLK_PLL_P_OUT5>,
+			 <&tegra_car TEGRA210_CLK_PLL_G_REF>;
+		clock-names = "gpu", "pwr", "ref";
 		resets = <&tegra_car 184>;
 		reset-names = "gpu";
+
+		iommus = <&mc TEGRA_SWGROUP_GPU>;
+
 		status = "disabled";
 	};