Document the device tree bindings for the Adreno GMU device
available on Adreno a6xx targets.

Change-Id: I3cfd5fb35ab0045e39905ff12393006e60f1a124
Signed-off-by: Jordan Crouse <jcro...@codeaurora.org>
---
 .../devicetree/bindings/display/msm/gmu.txt        | 54 ++++++++++++++++++++++
 .../devicetree/bindings/display/msm/gpu.txt        | 10 +++-
 2 files changed, 62 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/msm/gmu.txt

diff --git a/Documentation/devicetree/bindings/display/msm/gmu.txt 
b/Documentation/devicetree/bindings/display/msm/gmu.txt
new file mode 100644
index 000000000000..f65bb49fff36
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/msm/gmu.txt
@@ -0,0 +1,54 @@
+Qualcomm adreno/snapdragon GMU (Graphics management unit)
+
+The GMU is a programmable power controller for the GPU. the CPU controls the
+GMU which in turn handles power controls for the GPU.
+
+Required properties:
+- compatible:
+  * "qcom,adreno-gmu"
+- reg: Physical base address and length of the GMU registers.
+- reg-names: Matching names for the register regions
+  * "gmu"
+  * "gmu_pdc"
+- interrupts: The interrupt signals from the GMU.
+- interrupt-names: Matching names for the interrupts
+  * "hfi"
+  * "gmu"
+- clocks: phandles to the device clocks
+- clock-names: Matching names for the clocks
+   * "gmu"
+   * "cxo"
+   * "axi"
+   * "mnoc"
+- power-domains: should be <&clock_gpucc GPU_CX_GDSC>
+- iommus: phandle to the adreno iommu
+- operating-points-v2: phandle to the OPP operating points
+
+Example:
+
+/ {
+       ...
+
+       gmu: gmu@506a000 {
+               compatible="qcom,adreno-gmu";
+
+               reg = <0x506a000 0x30000>,
+                       <0xb200000 0x300000>;
+               reg-names = "gmu", "gmu_pdc";
+
+               interrupts = <GIC_SPI 304 IRQ_TYPE_LEVEL_HIGH>,
+                       <GIC_SPI 305 IRQ_TYPE_LEVEL_HIGH>;
+               interrupt-names = "hfi", "gmu";
+
+               clocks = <&clock_gpucc GPU_CC_CX_GMU_CLK>,
+                       <&clock_gpucc GPU_CC_CXO_CLK>,
+                       <&clock_gcc GCC_DDRSS_GPU_AXI_CLK>,
+                       <&clock_gcc GCC_GPU_MEMNOC_GFX_CLK>;
+               clock-names = "gmu", "cxo", "axi", "memnoc";
+
+               power-domains = <&clock_gpucc GPU_CX_GDSC>;
+               iommus = <&adreno_smmu 5>;
+
+       i       operating-points-v2 = <&gmu_opp_table>;
+       };
+};
diff --git a/Documentation/devicetree/bindings/display/msm/gpu.txt 
b/Documentation/devicetree/bindings/display/msm/gpu.txt
index 43fac0fe09bb..0e207498edd3 100644
--- a/Documentation/devicetree/bindings/display/msm/gpu.txt
+++ b/Documentation/devicetree/bindings/display/msm/gpu.txt
@@ -8,12 +8,18 @@ Required properties:
   with the chip-id.
 - reg: Physical base address and length of the controller's registers.
 - interrupts: The interrupt signal from the gpu.
-- clocks: device clocks
+
+Optional properties.
+- clocks: device clocks. Required for a3xx, a4xx and a5xx targets. a6xx and
+  newer with a GMU attached do not have direct clock control from the CPU and
+  do not need to provide clock properties.
   See ../clocks/clock-bindings.txt for details.
-- clock-names: the following clocks are required:
+- clock-names: the following clocks can be provided:
   * "core"
   * "iface"
   * "mem_iface"
+- gmu: For a6xx and newer targets a phandle to the GMU device that will
+  control the power for the GPU
 
 Example:
 
-- 
2.16.1

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