linux-kernel - Re: [PATCH v2 01/18] dt-bindings: panel: lvds: Document power-supply property

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Message-ID: <CAL_JsqLNxTGuu7FmOOgN3e2+CbV=DTeb=kJf7RqUdtGU=yuueA@mail.gmail.com>
Date:   Thu, 30 Nov 2017 13:57:09 -0600
From:   Rob Herring <robh+dt@...nel.org>
To:     Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:     Daniel Vetter <daniel.vetter@...el.com>,
        David Airlie <airlied@...ux.ie>, Chen-Yu Tsai <wens@...e.org>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Priit Laes <plaes@...es.org>, Icenowy Zheng <icenowy@...c.io>,
        Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [PATCH v2 01/18] dt-bindings: panel: lvds: Document power-supply property

On Thu, Nov 30, 2017 at 9:30 AM, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> Hi Rob,
>
> On Tue, Nov 28, 2017 at 11:48:47AM -0600, Rob Herring wrote:
>> Please CC DT list.
>>
>> On Mon, Nov 27, 2017 at 9:41 AM, Maxime Ripard
>> <maxime.ripard@...e-electrons.com> wrote:
>> > The power-supply property is used by a vast majority of panels, including
>> > panel-simple. Let's document it as a common property
>> >
>> > Signed-off-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
>> > ---
>> >  Documentation/devicetree/bindings/display/panel/panel-common.txt | 6 ++++++
>> >  Documentation/devicetree/bindings/display/panel/panel-lvds.txt   | 1 +
>> >  2 files changed, 7 insertions(+)
>> >
>> > diff --git a/Documentation/devicetree/bindings/display/panel/panel-common.txt b/Documentation/devicetree/bindings/display/panel/panel-common.txt
>> > index ec52c472c845..125ea68052af 100644
>> > --- a/Documentation/devicetree/bindings/display/panel/panel-common.txt
>> > +++ b/Documentation/devicetree/bindings/display/panel/panel-common.txt
>> > @@ -78,6 +78,12 @@ used for panels that implement compatible control signals.
>> >    while active. Active high reset signals can be supported by inverting the
>> >    GPIO specifier polarity flag.
>> >
>> > +Power
>> > +-----
>> > +
>> > +- power-supply: many display panels need an additional power supply in
>> > +  order to be fully powered-up. For such panels, power-supply contains
>> > +  a phandle to the regulator powering the panel.
>> >
>> >  Backlight
>> >  ---------
>> > diff --git a/Documentation/devicetree/bindings/display/panel/panel-lvds.txt b/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
>> > index b938269f841e..250850a2150b 100644
>> > --- a/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
>> > +++ b/Documentation/devicetree/bindings/display/panel/panel-lvds.txt
>> > @@ -32,6 +32,7 @@ Optional properties:
>> >  - label: See panel-common.txt.
>> >  - gpios: See panel-common.txt.
>> >  - backlight: See panel-common.txt.
>> > +- power-supply: See panel-common.txt.
>>
>> simple-panel.txt should do the same.
>
> I'll make simple-panel do that then
>
>> Really, I'd like to see panel-common.txt and simple-panel.txt merged
>> and simple-panel.txt removed altogether. But there are a lot of
>> references back to simple-panel.txt. A given panel still needs to say
>> what common properties it uses or doesn't use. Omitting a property
>> like power-supply is ambiguous and can either mean "I only have 1
>> supply" or "I haven't thought about supplies yet there are more than
>> 1".
>
> While I agree with you here, and in general, power-supply should be
> mandatory, do you expect me to fix all the panel bindings as part of
> this serie?

No, certainly not.

Rob