linux-kernel - Re: [v2 2/3] media: ov8856: Add devicetree support

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Date:   Tue, 31 Mar 2020 15:37:22 +0200
From:   Robert Foss <robert.foss@...aro.org>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Dongchun Zhu <dongchun.zhu@...iatek.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sakari Ailus <sakari.ailus@....fi>,
        Tomasz Figa <tfiga@...omium.org>,
        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>
Subject: Re: [v2 2/3] media: ov8856: Add devicetree support

On Thu, 26 Mar 2020 at 13:18, Robert Foss <robert.foss@...aro.org> wrote:
>
> Hey Fabio,
>
> On Fri, 13 Mar 2020 at 14:15, Fabio Estevam <festevam@...il.com> wrote:
> >
> > Hi Robert,
> >
> > On Fri, Mar 13, 2020 at 8:04 AM Robert Foss <robert.foss@...aro.org> wrote:
> >
> > > +static int __ov8856_power_on(struct ov8856 *ov8856)
> > > +{
> > > +       struct i2c_client *client = v4l2_get_subdevdata(&ov8856->sd);
> > > +       int ret;
> > > +
> > > +       ret = clk_prepare_enable(ov8856->xvclk);
> > > +       if (ret < 0) {
> > > +               dev_err(&client->dev, "failed to enable xvclk\n");
> > > +               return ret;
> > > +       }
> > > +
> > > +       gpiod_set_value_cansleep(ov8856->reset_gpio, GPIOD_OUT_HIGH);
> >
> > The parameter of gpiod_set_value_cansleep() is typically 0 (inactive
> > state) or 1 (active state), so:
> >
> >  gpiod_set_value_cansleep(ov8856->reset_gpio, 1);
>
> Ack

After testing this change, it breaks the driver during probing.
I had a quick look into GPIOD_OUT_HIGH & LOW definitions, and they
seem to never be 0 or 1.

https://elixir.bootlin.com/linux/latest/source/include/linux/gpio/consumer.h#L38

GPIOD_ASIS = 0,
GPIOD_IN = 1,
GPIOD_OUT_LOW = 3
GPIOD_OUT_HIGH = 7