Subject: Re: [PATCH 1/3] dt-bindings: display: Add Document for Rockchip Soc
 LVDS
To: Philipp Zabel <p.zabel@pengutronix.de>,
        Mark Yao <mark.yao@rock-chips.com>, David Airlie <airlied@linux.ie>,
        Rob Herring <robh+dt@kernel.org>, Mark Rutland <mark.rutland@arm.com>,
        Heiko Stuebner <heiko@sntech.de>
Cc: linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org,
        linux-rockchip@lists.infradead.org
References: <1502272846-63941-1-git-send-email-hjc@rock-chips.com>
 <1502272851-63997-1-git-send-email-hjc@rock-chips.com>
 <1502465911.2310.18.camel@pengutronix.de>
From: Sandy Huang <hjc@rock-chips.com>
Message-ID: <7ebfa933-57ca-658a-84ef-6e47b0009209@rock-chips.com>
Date: Mon, 14 Aug 2017 12:04:38 +0800
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在 2017/8/11 23:38, Philipp Zabel 写道:
> On Wed, 2017-08-09 at 18:00 +0800, Sandy Huang wrote:
>> This patch add Document for Rockchip Soc RK3288 LVDS,
>> This based on the patches from Mark yao and Heiko Stuebner.
>>
>>> Signed-off-by: Sandy Huang <hjc@rock-chips.com>
>>> Signed-off-by: Mark yao <mark.yao@rock-chips.com>
>>> Signed-off-by: Heiko Stuebner <heiko@sntech.de>
>> ---
>>   .../bindings/display/rockchip/rockchip-lvds.txt    | 104 +++++++++++++++++++++
>>   1 file changed, 104 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt
>>
>> diff --git a/Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt b/Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt
>> new file mode 100644
>> index 0000000..bf934ba
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/display/rockchip/rockchip-lvds.txt
>> @@ -0,0 +1,104 @@
>> +Rockchip RK3288 LVDS interface
>> +================================
>> +
>> +Required properties:
>> +- compatible: matching the soc type, one of
>>> +	- "rockchip,rk3288-lvds";
>> +
>> +- reg: physical base address of the controller and length
>>> +	of memory mapped region.
>> +- clocks: must include clock specifiers corresponding to entries in the
>>> +	clock-names property.
>> +- clock-names: must contain "pclk_lvds"
>> +
>> +- avdd1v0-supply: regulator phandle for 1.0V analog power
>> +- avdd1v8-supply: regulator phandle for 1.8V analog power
>> +- avdd3v3-supply: regulator phandle for 3.3V analog power
>> +
>> +- rockchip,grf: phandle to the general register files syscon
>> +
>> +Optional properties
>> +- pinctrl-names: must contain a "lcdc" entry.
>> +- pinctrl-0: pin control group to be used for this controller.
>> +
>> +Required nodes:
>> +
>> +The lvds has two video ports as described by
>>> +	Documentation/devicetree/bindings/media/video-interfaces.txt.
>> +Their connections are modeled using the OF graph bindings specified in
>>> +	Documentation/devicetree/bindings/graph.txt.
>> +
>> +- video port 0 for the VOP inputs
>> +- video port 1 for either a panel or subsequent encoder
>> +
>> +the lvds panel described by
>>> +	Documentation/devicetree/bindings/display/panel/simple-panel.txt
>> +
>> +- rockchip,data-mapping: should be "vesa" or "jeida",
>>> +	This describes how the color bits are laid out in the
>>> +	serialized LVDS signal.
>> +- rockchip,data-width : should be <18> or <24>;
> 
> This can already be described by the panel itself, via the bus_format
> property in the panel_desc for panel-simple, or via the existing panel
> device tree property "data-mapping" in panel-lvds, which can be set to
> "jeida-18", "jeida-24", or "vesa-24".
> 
> The LVDS driver can then read the panel bus information from the
> panel's connector->display_info.bus_formats.
> 
Because the lvds maybe connected to panel or some cover chip just like 
rgb2cvbs etc. , in this case, we no need to enable panel, so we have to 
get this proterty at here.

> So if these properties are necessary at all, they at least should be
> optional (overrides).
>
ok, i will set data-mapping to option.
> regards
> Philipp
> 
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