These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / display / msm / gpu.txt

diff --git a/kernel/Documentation/devicetree/bindings/display/msm/gpu.txt b/kernel/Documentation/devicetree/bindings/display/msm/gpu.txt
new file mode 100644 (file)
index 0000000..67d0a58
--- /dev/null
+++ b/kernel/Documentation/devicetree/bindings/display/msm/gpu.txt
@@ -0,0 +1,52 @@
+Qualcomm adreno/snapdragon GPU
+
+Required properties:
+- compatible: "qcom,adreno-3xx"
+- reg: Physical base address and length of the controller's registers.
+- interrupts: The interrupt signal from the gpu.
+- clocks: device clocks
+  See ../clocks/clock-bindings.txt for details.
+- clock-names: the following clocks are required:
+  * "core_clk"
+  * "iface_clk"
+  * "mem_iface_clk"
+- qcom,chipid: gpu chip-id.  Note this may become optional for future
+  devices if we can reliably read the chipid from hw
+- qcom,gpu-pwrlevels: list of operating points
+  - compatible: "qcom,gpu-pwrlevels"
+  - for each qcom,gpu-pwrlevel:
+    - qcom,gpu-freq: requested gpu clock speed
+    - NOTE: downstream android driver defines additional parameters to
+      configure memory bandwidth scaling per OPP.
+
+Example:
+
+/ {
+       ...
+
+       gpu: qcom,kgsl-3d0@4300000 {
+               compatible = "qcom,adreno-3xx";
+               reg = <0x04300000 0x20000>;
+               reg-names = "kgsl_3d0_reg_memory";
+               interrupts = <GIC_SPI 80 0>;
+               interrupt-names = "kgsl_3d0_irq";
+               clock-names =
+                   "core_clk",
+                   "iface_clk",
+                   "mem_iface_clk";
+               clocks =
+                   <&mmcc GFX3D_CLK>,
+                   <&mmcc GFX3D_AHB_CLK>,
+                   <&mmcc MMSS_IMEM_AHB_CLK>;
+               qcom,chipid = <0x03020100>;
+               qcom,gpu-pwrlevels {
+                       compatible = "qcom,gpu-pwrlevels";
+                       qcom,gpu-pwrlevel@0 {
+                               qcom,gpu-freq = <450000000>;
+                       };
+                       qcom,gpu-pwrlevel@1 {
+                               qcom,gpu-freq = <27000000>;
+                       };
+               };
+       };
+};