[PATCH 6/6] drm/msm: Document the zap-shader subnode for the GPU

[Jordan Crouse <jcrouse-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>]

The 'zap-shader' subnode is used to define a phandle for the
PIL memory region that is required to load GPU secure firwmare images
(known as the "zap shader").

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---
 Documentation/devicetree/bindings/display/msm/gpu.txt | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/msm/gpu.txt b/Documentation/devicetree/bindings/display/msm/gpu.txt
index 43fac0f..0376b20 100644
--- a/Documentation/devicetree/bindings/display/msm/gpu.txt
+++ b/Documentation/devicetree/bindings/display/msm/gpu.txt
@@ -15,6 +15,15 @@ Required properties:
   * "iface"
   * "mem_iface"
 
+Subnodes:
+- zap-shader:	Defines the memory region used by the zap shader
+		to load the firmware via the PIL loader. This is required
+		for adreno-5xx targets and newer unless the secure mode
+		is specifically disabled on a target.
+
+Required properties for zap-shader:
+- memory-region: Phandle to the PIL reserved memory region.
+
 Example:
 
 / {
@@ -34,5 +43,9 @@ Example:
 		    <&mmcc GFX3D_CLK>,
 		    <&mmcc GFX3D_AHB_CLK>,
 		    <&mmcc MMSS_IMEM_AHB_CLK>;
+
+		zap-shader {
+			memory-region = <&peripheral_reserved>;
+		};
 	};
 };
-- 
1.9.1

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