linux-kernel - Re: [v1 1/3] media: dt-bindings: ov8856: Document YAML bindings

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Message-ID: <CAG3jFyuLMxUEr7yZAHT99JK8NoUZc-aquuMEtSBH_Vipa-_giQ@mail.gmail.com>
Date:   Tue, 10 Mar 2020 16:51:36 +0100
From:   Robert Foss <robert.foss@...aro.org>
To:     Fabio Estevam <festevam@...il.com>
Cc:     ben.kao@...el.com, Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan.Cameron@...wei.com,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        linux-media <linux-media@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        linux-mediatek@...ts.infradead.org,
        Dongchun Zhu <dongchun.zhu@...iatek.com>,
        Tomasz Figa <tfiga@...omium.org>
Subject: Re: [v1 1/3] media: dt-bindings: ov8856: Document YAML bindings

Hey Fabio,

Thanks for having a look at this series so quickly.

On Tue, 10 Mar 2020 at 14:57, Fabio Estevam <festevam@...il.com> wrote:
>
> Hi Robert,
>
> On Tue, Mar 10, 2020 at 10:46 AM Robert Foss <robert.foss@...aro.org> wrote:
>
> > +    ov8856: camera-sensor@10 {
> > +        compatible = "ovti,ov8856";
> > +        reg = <0x10>;
> > +        reset-gpios = <&pio 111 GPIO_ACTIVE_HIGH>;
>
> Could you double check this is correct? Other OmniVision sensors have
> reset-gpios as active low.

I have tested this, unfortunately I don't have access to a ov8856
datasheet that includes
this level of detail. But I have tested this.

>
> I suspect that the driver has also an inverted logic, so that's why it works.

That could explain it still working. Let me have a look into the
driver and see what it does.

>
> I don't have access to the datasheet though, so I am just guessing.

Me neither unfortunately, if anyone does have a link for it, I would
very much appreciate it.