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From: Sam Ravnborg <sam@ravnborg.org>
To: devicetree@vger.kernel.org, Rob Herring <robh@kernel.org>,
 dri-devel@lists.freedesktop.org
Subject: [PATCH v1 3/4] dt-bindings: media: add wiring property to
 video-interfaces
Date: Sun, 12 Apr 2020 20:20:11 +0200
Message-Id: <20200412182012.27515-4-sam@ravnborg.org>
In-Reply-To: <20200412182012.27515-1-sam@ravnborg.org>
References: <20200412182012.27515-1-sam@ravnborg.org>
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Cc: Alexandre Belloni <alexandre.belloni@bootlin.com>,
 Boris Brezillon <bbrezillon@kernel.org>,
 Nicolas Ferre <nicolas.ferre@microchip.com>, Hans Verkuil <hverkuil@xs4all.nl>,
 Mauro Carvalho Chehab <mchehab@kernel.org>, Sam Ravnborg <sam@ravnborg.org>,
 linux-media@vger.kernel.org
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The wiring property is used to describe the wiring between
the connector and the panel. The property can be used when the
wiring is used to change the mode from for example
BGR to RGB. The first users are the at91sam9 family where
such a wiring trick is sometimes used.
The possilbe values are so far limited to what is required
by the at91sam9 family, but using "text" allows us to extend
this in the future.

There exists similar properties today:
 - display/tilcdc/tilcdc.txt: blue-and-red-wiring
 - display/atmel,lcdc.txt: atmel,lcd-wiring-mode

Neither of the above are defined as endpoint properties.

The new property "wiring" has a more general name and
is defined as an endpoint property.
It will replace atmel,lcd-wiring-mode and may replace
blue-and-red-wiring.

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Cc: Rob Herring <robh@kernel.org>
Cc: Hans Verkuil <hverkuil@xs4all.nl>
Cc: linux-media@vger.kernel.org
---
 Documentation/devicetree/bindings/media/video-interfaces.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/media/video-interfaces.txt b/Documentation/devicetree/bindings/media/video-interfaces.txt
index f884ada0bffc..c3bb87c5c9a9 100644
--- a/Documentation/devicetree/bindings/media/video-interfaces.txt
+++ b/Documentation/devicetree/bindings/media/video-interfaces.txt
@@ -141,6 +141,9 @@ Optional endpoint properties
 - link-frequencies: Allowed data bus frequencies. For MIPI CSI-2, for
   instance, this is the actual frequency of the bus, not bits per clock per
   lane value. An array of 64-bit unsigned integers.
+- wiring: Wiring of data lines to display.
+  "straight" - normal wiring.
+  "red-blue-reversed" - red and blue lines reversed.
 - lane-polarities: an array of polarities of the lanes starting from the clock
   lane and followed by the data lanes in the same order as in data-lanes.
   Valid values are 0 (normal) and 1 (inverted). The length of the array
-- 
2.20.1

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