linux-kernel - Re: [PATCH v3 1/5] dt-bindings: media: max9286: Define 'maxim,gpio-poc'

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Message-ID: <CAMuHMdV6=DXO4AzrhgcDzdCNB4qYua2jkGsEcZyi5FwnbF70tQ@mail.gmail.com>
Date:   Thu, 15 Apr 2021 08:59:50 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jacopo Mondi <jacopo@...ndi.org>
Cc:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Rob Herring <robh+dt@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/5] dt-bindings: media: max9286: Define 'maxim,gpio-poc'

Hi Jacopo,

On Thu, Apr 15, 2021 at 8:53 AM Jacopo Mondi <jacopo@...ndi.org> wrote:
> On Thu, Apr 15, 2021 at 02:47:12AM +0300, Laurent Pinchart wrote:
> > On Wed, Apr 14, 2021 at 03:51:24PM +0200, Jacopo Mondi wrote:
> > > Define a new vendor property in the maxim,max9286 binding schema.
> > >
> > > The new property allows to declare that the remote camera
> > > power-over-coax is controlled by one of the MAX9286 gpio lines.
> > >
> > > As it is currently not possible to establish a regulator as consumer
> > > of the MAX9286 gpio controller for this purpose, the property allows to
> > > declare that the camera power is controlled by the MAX9286 directly.
> > >
> > > The property accepts a gpio-index (0 or 1) and one line polarity
> > > flag as defined by dt-bindings/gpio/gpio.h.
> > >
> > > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
> > > ---
> > >  .../bindings/media/i2c/maxim,max9286.yaml     | 53 ++++++++++++++++++-
> > >  1 file changed, 52 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> > > index ee16102fdfe7..480a491f3744 100644
> > > --- a/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> > > +++ b/Documentation/devicetree/bindings/media/i2c/maxim,max9286.yaml
> > > @@ -70,6 +70,24 @@ properties:
> > >        a remote serializer whose high-threshold noise immunity is not enabled
> > >        is 100000 micro volts
> > >
> > > +  maxim,gpio-poc:
> >
> > I would have written poc-gpio to match the order of the GPIO bindings
> > syntax.
> >
>
> That's what I had :) but then the property gets matched against the
> gpio schema and I get complains because it expects a phandle as first
> argument... Maybe there's a way I've missed to prevent the property to
> be matched with *-gpio ?

GPIO hogs also use gpio properties lacking the phandle.
Hence the way this is handled for hogs may (or may not, it's yaml after all ;-)
inspire you how to handle this here.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds