On Wed, Dec 09, 2015 at 12:48:15PM +0100, Lucas Stach wrote:
Etnaviv follows the same priciple as imx-drm to have a virtual master device node to bind all the individual GPU cores together into one DRM device.
Signed-off-by: Lucas Stach l.stach@pengutronix.de
Acked-by: Rob Herring robh@kernel.org
v2: Add note why a more specific compatible isn't needed for GPU core nodes.
.../bindings/display/etnaviv/etnaviv-drm.txt | 49 ++++++++++++++++++++++ 1 file changed, 49 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/etnaviv/etnaviv-drm.txt
diff --git a/Documentation/devicetree/bindings/display/etnaviv/etnaviv-drm.txt b/Documentation/devicetree/bindings/display/etnaviv/etnaviv-drm.txt new file mode 100644 index 000000000000..01254f40b11b --- /dev/null +++ b/Documentation/devicetree/bindings/display/etnaviv/etnaviv-drm.txt @@ -0,0 +1,49 @@ +Etnaviv DRM master device +================================
+The Etnaviv DRM master device is a virtual device needed to list all +Vivante GPU cores that comprise the GPU subsystem.
+Required properties: +- compatible: Should be one of
- "fsl,imx-gpu-subsystem"
- "marvell,dove-gpu-subsystem"
+- cores: Should contain a list of phandles pointing to Vivante GPU devices
+example:
+gpu-subsystem {
- compatible = "fsl,imx-gpu-subsystem";
- cores = <&gpu_2d>, <&gpu_3d>;
+};
+Vivante GPU core devices +====================
+Required properties: +- compatible: Should be "vivante,gc"
- A more specific compatible is not needed, as the cores contain chip
- identification registers at fixed locations, which provide all the
- necessary information to the driver.
+- reg: should be register base and length as documented in the
- datasheet
+- interrupts: Should contain the cores interrupt line +- clocks: should contain one clock for entry in clock-names
- see Documentation/devicetree/bindings/clock/clock-bindings.txt
+- clock-names:
- "bus": AXI/register clock
- "core": GPU core clock
- "shader": Shader clock (only required if GPU has feature PIPE_3D)
+example:
+gpu_3d: gpu@00130000 {
- compatible = "vivante,gc";
- reg = <0x00130000 0x4000>;
- interrupts = <0 9 IRQ_TYPE_LEVEL_HIGH>;
- clocks = <&clks IMX6QDL_CLK_GPU3D_AXI>,
<&clks IMX6QDL_CLK_GPU3D_CORE>,<&clks IMX6QDL_CLK_GPU3D_SHADER>;- clock-names = "bus", "core", "shader";
+};
2.6.2