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

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Date:   Thu, 15 Mar 2018 19:56:58 -0700
From:   Alexandru M Stan <amstan@...omium.org>
To:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Sean Paul <seanpaul@...omium.org>
Cc:     devicetree@...r.kernel.org,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Heiko Stuebner <heiko@...ech.de>, briannorris@...omium.org,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        dianders@...omium.org, linux-rockchip@...ts.infradead.org,
        marcheu@...omium.org, hoegsberg@...omium.org,
        Thierry Escande <thierry.escande@...labora.com>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Alexandru M Stan <amstan@...omium.org>
Subject: [PATCH 1/2] dt-bindings: analogix-dp: Add backlight-pwm-passthru

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@...omium.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