[PATCH 1/2] dt-bindings: analogix-dp: Add backlight-pwm-passthru

[Alexandru M Stan]

Documentation for the optional backlight-pwm-passthru property.
Tells the EDP panel to folow the input pwm frequency instead
of generating its own.

Signed-off-by: Alexandru M Stan <amstan at chromium.org>
---

 Documentation/devicetree/bindings/display/bridge/analogix_dp.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt b/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt
index 0c7473dd0e51..3c15242f6ce3 100644
--- a/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt
+++ b/Documentation/devicetree/bindings/display/bridge/analogix_dp.txt
@@ -23,6 +23,10 @@ Required properties for dp-controller:
 		from general PHY binding: Should be "dp".
 
 Optional properties for dp-controller:
+	-backlight-pwm-passthru:
+		Directly pass the PWM frequency applied to the BL_PWM_DIM
+		pin to the backlight current source. Done via
+		EDP_BACKLIGHT_MODE_SET_REGISTER on DPCD.
 	-force-hpd:
 		Indicate driver need force hpd when hpd detect failed, this
 		is used for some eDP screen which don't have hpd signal.
-- 
2.13.5