[PATCH 7/9] dt-bindings: media/s5p-cec.txt: document needs-hpd property

[Hans Verkuil]

From: Hans Verkuil <hans.verkuil at cisco.com>

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 at cisco.com>
Cc: Krzysztof Kozlowski <krzk at kernel.org>
Cc: Andrzej Hajda <a.hajda at samsung.com>
Cc: devicetree at vger.kernel.org
---
 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 at 100B0000 {
-- 
2.11.0