linux-kernel - Re: [PATCH v3 1/4] dt-bindings: input: touchscreen: goodix: Document AVDD28-supply property

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Date:   Wed, 9 Jan 2019 07:37:53 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Jagan Teki <jagan@...rulasolutions.com>
Cc:     Chen-Yu Tsai <wens@...e.org>, linux-input@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Michael Trimarchi <michael@...rulasolutions.com>,
        linux-amarula@...rulasolutions.com
Subject: Re: [PATCH v3 1/4] dt-bindings: input: touchscreen: goodix: Document
 AVDD28-supply property

Please CC DT list if you want bindings reviewed.

On Wed, Jan 9, 2019 at 1:40 AM Dmitry Torokhov
<dmitry.torokhov@...il.com> wrote:
>
> On Sat, Dec 15, 2018 at 08:47:59PM +0530, Jagan Teki wrote:
> > Most of the Goodix CTP controllers are supply with AVDD28 pin.
> > which need to supply for controllers like GT5663 on some boards
> > to trigger the power.
> >
> > So, document the supply property so-that the require boards
> > that used on GT5663 can enable it via device tree.
> >
> > Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> > ---
> >  Documentation/devicetree/bindings/input/touchscreen/goodix.txt | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> > index f7e95c52f3c7..c4622c983e08 100644
> > --- a/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> > +++ b/Documentation/devicetree/bindings/input/touchscreen/goodix.txt
> > @@ -23,6 +23,7 @@ Optional properties:
> >   - touchscreen-inverted-y  : Y axis is inverted (boolean)
> >   - touchscreen-swapped-x-y : X and Y axis are swapped (boolean)
> >                               (swapping is done after inverting the axis)
> > + - AVDD28-supply     : Analog power supply regulator on AVDD28 pin
>
> I think we normally use lower case in DT bindings and rarely encode
> voltage in the supply name unless we are dealing with several supplies
> of the same kind, but I'll let Ron comment on this.

Yes on lowercase though there are some exceptions.

There's also a AVDD22 supply as well as DVDD12 and VDDIO. So we
probably need to keep the voltage, but the binding is incomplete.

Rob