add description for postmask

Signed-off-by: Yongqiang Niu <yongqiang....@mediatek.com>
---
 Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git 
a/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt 
b/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt
index 5ca693a..1972fa7 100644
--- a/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt
+++ b/Documentation/devicetree/bindings/display/mediatek/mediatek,disp.txt
@@ -37,6 +37,7 @@ Required properties (all function blocks):
        "mediatek,<chip>-disp-aal"              - adaptive ambient light 
controller
        "mediatek,<chip>-disp-gamma"            - gamma correction
        "mediatek,<chip>-disp-merge"            - merge streams from two RDMA 
sources
+       "mediatek,<chip>-disp-postmask"         - post mask
        "mediatek,<chip>-disp-split"            - split stream to two encoders
        "mediatek,<chip>-disp-ufoe"             - data compression engine
        "mediatek,<chip>-dsi"                   - DSI controller, see 
mediatek,dsi.txt
-- 
1.8.1.1.dirty

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