dt-bindings: Add documentation for GM20B GPU

GM20B's definition is mostly similar to GK20A's, but requires an
additional clock.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/Documentation/devicetree/bindings/gpu/nvidia,gk20a.txt b/Documentation/devicetree/bindings/gpu/nvidia,gk20a.txt
index 1e374833731948b6d6372bafcb1ddcbed54a3855..ff3db65e50def8224096107eaf05827df884ca25 100644 (file)
--- a/Documentation/devicetree/bindings/gpu/nvidia,gk20a.txt
+++ b/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,<gpu>"
   Currently recognized values:
   - nvidia,gk20a
+  - nvidia,gm20b
 - reg: Physical base address and length of the controller's registers.
   Must contain two entries:
   - first entry for bar0
@@ -19,6 +20,9 @@ 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:
@@ -27,9 +31,9 @@ Required properties:
 Optional properties:
 - iommus: A reference to the IOMMU. See ../iommu/iommu.txt for details.
 
-Example:
+Example for GK20A:
 
-       gpu@0,57000000 {
+       gpu@57000000 {
                compatible = "nvidia,gk20a";
                reg = <0x0 0x57000000 0x0 0x01000000>,
                      <0x0 0x58000000 0x0 0x01000000>;
@@ -45,3 +49,22 @@ Example:
                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";
+       };