linux-kernel - Re: [PATCH] media: dt-bindings: Convert Omnivision OV7251 to DT schema

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Message-ID: <CAL_JsqLBTGeyJgCgPjQL1SdMc73=DBWRRmcsO6YXQkPSAAvWXQ@mail.gmail.com>
Date:   Tue, 11 Jul 2023 08:09:14 -0600
From:   Rob Herring <robh@...nel.org>
To:     Conor Dooley <conor@...nel.org>
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Todor Tomov <todor.too@...il.com>, linux-media@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: dt-bindings: Convert Omnivision OV7251 to DT schema

On Mon, Jul 10, 2023 at 12:20 PM Conor Dooley <conor@...nel.org> wrote:
>
> On Mon, Jul 10, 2023 at 12:03:38PM -0600, Rob Herring wrote:
> > On Mon, Jul 10, 2023 at 11:57 AM Conor Dooley <conor@...nel.org> wrote:
> > >
> > > On Fri, Jul 07, 2023 at 03:06:46PM -0600, Rob Herring wrote:
> > > > Convert the OmniVision OV7251 Image Sensor binding to DT schema format.
> > > >
> > > > vddd-supply was listed as required, but the example and actual user
> > > > don't have it. Also, the data brief says it has an internal regulator,
> > > > so perhaps it is truly optional.
> > >
> > > ov7251.c:
> > >         ov7251->core_regulator = devm_regulator_get(dev, "vddd");
> > >         if (IS_ERR(ov7251->core_regulator)) {
> > >                 dev_err(dev, "cannot get core regulator\n");
> > >                 return PTR_ERR(ov7251->core_regulator);
> > >         }
> > >
> > > Looks like the driver's probe function disagrees?
> >
> > Doesn't the regulator framework return a dummy regulator if missing?
>
> Huh, I think I misunderstood how _regulator_get() worked. Apologies for
> the noise, I thought it was returning an error when it used a dummy.
>
> > > I was going to ask how it worked, but the one user has
> > > status = "disabled"...
> >
> > Saw that too, but figured there's some other include with that
> > overridden. We should really add a built .dts output target to avoid
> > trying to manually walk includes.
>
> Probably gonna sound like an eejit, but the user is in a dts - can an
> include overwrite that status?

Yes, sometimes .dts files are both built into a dtb and included. Say
you have a board with and without an optional camera sensor.

Rob