[PATCH v2 2/5] dt-bindings: Add display-timing subnode to simple-panel

[Sean Paul <seanpaul@chromium.org>]

This patch adds a new subnode to simple-panel allowing us to override
the typical timing expressed in the panel's display_timing.

Changes in v2:
 - Split out the binding into a new patch (Rob)
 - display-timings is a new section (Rob)
 - Use the full display-timings subnode instead of picking the timing
   out (Rob/Thierry)

Cc: Doug Anderson <dianders@chromium.org>
Cc: Eric Anholt <eric@anholt.net>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Jeffy Chen <jeffy.chen@rock-chips.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Stéphane Marchesin <marcheu@chromium.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: devicetree@vger.kernel.org
Cc: dri-devel@lists.freedesktop.org
Cc: linux-rockchip@lists.infradead.org
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 .../bindings/display/panel/simple-panel.txt        | 32 ++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/simple-panel.txt b/Documentation/devicetree/bindings/display/panel/simple-panel.txt
index 45a457ad38f0..9717b9b79d98 100644
--- a/Documentation/devicetree/bindings/display/panel/simple-panel.txt
+++ b/Documentation/devicetree/bindings/display/panel/simple-panel.txt
@@ -12,6 +12,24 @@ Optional properties:
 - enable-gpios: GPIO pin to enable or disable the panel
 - backlight: phandle of the backlight device attached to the panel
 
+display-timings subnode
+-----------------------
+
+This optional subnode is for devices which require a mode differing from the
+panel's "typical" display timing as programmed in the simple-panel driver.
+Overriding the driver mode must only be done in the following scenario:
+ - The restrictions motivating the override cannot be applied to the platform's
+   display driver (ie: it must be specific to the device not the platform)
+ - The panel must not have a fixed mode attributed to it in the driver
+ - The panel must provide at list one display_timing range by which the override
+   mode can be validated against
+ - The override mode will use the 'typ' values from the display-timings subnode
+ - You must provide all required properties for the display-timings subnode
+
+Format information on the display-timings subnode can be found in
+display-timing.txt.
+
+
 Example:
 
 	panel: panel {
@@ -22,4 +40,18 @@ Example:
 		enable-gpios = <&gpio 90 0>;
 
 		backlight = <&backlight>;
+
+		display-timings {
+			timing0: override {
+				clock-frequency = <266604720>;
+				hactive = <2400>;
+				hfront-porch = <48>;
+				hback-porch = <84>;
+				hsync-len = <32>;
+				vactive = <1600>;
+				vfront-porch = <3>;
+				vback-porch = <120>;
+				vsync-len = <10>;
+			};
+		};
 	};
-- 
2.16.0.rc1.238.g530d649a79-goog

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