linux-kernel - Re: [PATCH v2 5/6] dt-bindings: add Sharp LQ123P1JX31 panel binding

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Message-ID: <CAL_JsqKar09sS=7f-=AQLN88BDP8HE7vYmoWV5YGscwj6pY6Tw@mail.gmail.com>
Date:	Fri, 10 Jun 2016 12:54:48 -0500
From:	Rob Herring <robh@...nel.org>
To:	Doug Anderson <dianders@...omium.org>
Cc:	Yakir Yang <ykk@...k-chips.com>, David Airlie <airlied@...ux.ie>,
	Thierry Reding <thierry.reding@...il.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 5/6] dt-bindings: add Sharp LQ123P1JX31 panel binding

On Fri, Jun 10, 2016 at 11:40 AM, Doug Anderson <dianders@...omium.org> wrote:
> Rob,
>
> On Fri, Jun 10, 2016 at 6:42 AM, Rob Herring <robh@...nel.org> wrote:
>> On Wed, Jun 08, 2016 at 07:52:45PM +0800, Yakir Yang wrote:
>>> The Sharp LQ123P1JX31 is an 12.3" 2400x1600 TFT-LCD panel
>>> connected using eDP interfaces.
>>>
>>> Signed-off-by: Yakir Yang <ykk@...k-chips.com>
>>> ---
>>> Changes in v2:
>>> - Add dt-bindings of Sharp LQ123P1JX31 panel in v2
>>>
>>>  .../devicetree/bindings/display/panel/sharp,lq123p1jx31.txt        | 7 +++++++
>>>  1 file changed, 7 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/display/panel/sharp,lq123p1jx31.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/display/panel/sharp,lq123p1jx31.txt b/Documentation/devicetree/bindings/display/panel/sharp,lq123p1jx31.txt
>>> new file mode 100644
>>> index 0000000..81938c0
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/display/panel/sharp,lq123p1jx31.txt
>>> @@ -0,0 +1,7 @@
>>> +Sharp 12.3" (2400x1600 pixels) TFT LCD panel
>>> +
>>> +Required properties:
>>> +- compatible: should be "sharp,lq123p1jx31,"
>>                                              ^
>> Need to drop the comma.
>
> Thanks for catching!
>
>> No regulators or resets or pwms?
>
> Could be more explicit I guess, but Yakir does say:
>
>> This binding is compatible with the simple-panel binding, which is specified
>> in simple-panel.txt in this directory.
>
> In that document it shows:
>
> Required properties:
> - power-supply: regulator to provide the supply voltage
>
> Optional properties:
> - ddc-i2c-bus: phandle of an I2C controller used for DDC EDID probing
> - enable-gpios: GPIO pin to enable or disable the panel
> - backlight: phandle of the backlight device attached to the panel

Ah yes, NM.

> In general Yakir's bindings document match a huge chunk of the current
> existing bindings.  Do this:
>   cd Documentation/devicetree/bindings/display/panel
>   grep -C20 "This binding is compatible with the simple-panel" *
>
> You'll find a huge chunk of files which are rather formulaic.  It
> might make sense to just have one file and a list of panels which are
> simple panels?

If we're just documenting compatible strings, then maybe so.

Rob