From: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Needed for boards that wire the CEC pin in such a way that it
is unavailable when the HPD is low.
Signed-off-by: Hans Verkuil <hans.verkuil@xxxxxxxxx>
Cc: Krzysztof Kozlowski <krzk@xxxxxxxxxx>
Cc: Andrzej Hajda <a.hajda@xxxxxxxxxxx>
Cc: devicetree@xxxxxxxxxxxxxxx
---
Documentation/devicetree/bindings/media/s5p-cec.txt | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/media/s5p-cec.txt b/Documentation/devicetree/bindings/media/s5p-cec.txt
index 4bb08d9d940b..261af4d1a791 100644
--- a/Documentation/devicetree/bindings/media/s5p-cec.txt
+++ b/Documentation/devicetree/bindings/media/s5p-cec.txt
@@ -17,6 +17,12 @@ Required properties:
- samsung,syscon-phandle - phandle to the PMU system controller
- hdmi-phandle - phandle to the HDMI controller
+Optional:
+ - needs-hpd : if present the CEC support is only available when the HPD
+ is high. Some boards only let the CEC pin through if the HPD is high, for
+ example if there is a level converter that uses the HPD to power up
+ or down.
+
Example:
hdmicec: cec@100B0000 {
--
2.11.0
