Add 'plane' child node to generic DISPC node as an optional
property.
Signed-off-by: Benoit Parrot <bparrot@xxxxxx>
---
.../devicetree/bindings/display/ti/ti,omap-dss.txt | 63 ++++++++++++++++++++++
1 file changed, 63 insertions(+)
diff --git a/Documentation/devicetree/bindings/display/ti/ti,omap-dss.txt b/Documentation/devicetree/bindings/display/ti/ti,omap-dss.txt
index 249e588d7865..cb101525b805 100644
--- a/Documentation/devicetree/bindings/display/ti/ti,omap-dss.txt
+++ b/Documentation/devicetree/bindings/display/ti/ti,omap-dss.txt
@@ -27,6 +27,34 @@ DISPC
Optional properties:
- max-memory-bandwidth: Input memory (from main memory to dispc) bandwidth limit
in bytes per second
+- plane: Child node(s) which defines which logical plane are available to
+ the system. If at least one plane child node is defined then
+ only planes defined by these nodes will be available to the system.
+ Plane nodes must be sequential starting with reg = <0> as DT parsing
+ will stop on the first missing numbered node.
+ This means if plane #1 is defined but plane #0 is not then it will
+ be as if none of the plane nodes were defined.
+
+ Each plane node contains the following properties:
+ Required properties:
+ - reg: Used to number the logical plane
+ - hw-planes: One or two HW plane number(s).
+ When 2 numbers are present this indicates a virtual plane
+ composed of two physical planes intended to be used
+ when the display is larger then the capacity of a
+ single plane i.e. wider than 2048 pixels.
+ The first number in the pair will dictate the capabilities
+ of the virtual plane. This means that for proper
+ operation the virtual plane should be composed of HW
+ planes of the same capabilities.
+ If GFX plane is used in a virtual plane it should be
+ specified first, otherwise unexpected behavior would
+ be encountered.
+ Optional property:
+ - hw-crtcs: One or more HW crtc number(s).
+ Describe the list of CRTCs on which this plane is
+ available. If this node is not present then the
+ plane will be available on all available CRTCs.
Video Ports
-----------
@@ -216,3 +244,38 @@ OMAP HDMI --(HDMI)--> TPD12S015 --(HDMI)--> HDMI Connector
};
};
};
+
+A short example on how to define a virtual plane configuration
+to enable wide display support.
+Here we define:
+- plane#0 to be the HW plane #0 (i.e. GFX plane)
+ only available on crtc #0
+- plane#1 to be a virtual wide plane composed of HW plane #1 and #2
+ (i.e. VID1 & VID2) available on crtc #0 & #1
+- plane#2 to be the HW plane #3 (i.e. VID3 plane)
+ only available on crtc #0
+
+&dss {
+ dispc@58001000 {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ plane@0 {
+ reg = <0>;
+ hw-planes = <0>;
+ hw-crtcs = <0>;
+ };
+
+ plane@1 {
+ reg = <1>;
+ hw-planes = <1 2>;
+ hw-crtcs = <0 1>;
+ };
+
+ plane@2 {
+ reg = <2>;
+ hw-planes = <3>;
+ hw-crtcs = <0>;
+ };
+ };
+};
--
2.9.0
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