linux-kernel - Re: [PATCH] display: panel: Add Tianma tm070rvhg71 display support (800x480)

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Date:   Mon, 6 Nov 2017 08:30:31 -0600
From:   Rob Herring <robh@...nel.org>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Mark Rutland <mark.rutland@....com>,
        Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <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] display: panel: Add Tianma tm070rvhg71 display support (800x480)

On Fri, Oct 27, 2017 at 3:18 AM, Lukasz Majewski <lukma@...x.de> wrote:
> Hi Rob,
>
>> On Sat, Oct 21, 2017 at 12:10:03AM +0200, Lukasz Majewski wrote:
>> > Signed-off-by: Lukasz Majewski <lukma@...x.de>
>> > ---
>> >  .../bindings/display/panel/tianma,tm070rvhg71.txt  |  7 ++++++
>> >  drivers/gpu/drm/panel/panel-simple.c               | 27
>> > ++++++++++++++++++++++ 2 files changed, 34 insertions(+)
>> >  create mode 100644
>> > Documentation/devicetree/bindings/display/panel/tianma,tm070rvhg71.txt
>> >
>> > diff --git
>> > a/Documentation/devicetree/bindings/display/panel/tianma,tm070rvhg71.txt
>> > b/Documentation/devicetree/bindings/display/panel/tianma,tm070rvhg71.txt
>> > new file mode 100644 index 0000000..b84217f --- /dev/null
>> > +++
>> > b/Documentation/devicetree/bindings/display/panel/tianma,tm070rvhg71.txt
>> > @@ -0,0 +1,7 @@ +Tianma Micro-electronics TM070RVHG71 7.0" WXGA TFT
>> > LCD panel +
>> > +Required properties:
>> > +- compatible: should be "tianma,tm070rvhg71
>> > +
>> > +This binding is compatible with the simple-panel binding, which is
>> > specified +in simple-panel.txt in this directory.
>>
>> No supplies? Still need to list power-supply here if so, so it is
>> clear that this display has a single supply (or you need to list
>> multiple ones if not).
>
> I took the same approach as several other simple panels having
> description in Documentation/devicetree/bindings/display/panel/*
> directory (e.g. innolux,g121i1-l01.txt) .
>
> In the description it is stated that this binding is compatible with
> one documented in the simple-panel.txt, which defines following
> properties:
>
> 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
>
>
> Do I need to do something more?

Yes. How do I know this panel has a single power supply vs. it has
multiple supplies and you haven't thought about supplies yet or they
aren't s/w controlled on some boards. The latter is frequently the
case when I go read the datasheets.

And yes there are examples that don't do this, but we're stricter now.

Rob