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

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Date:   Tue, 31 Mar 2020 10:42:33 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Robert Foss <robert.foss@...aro.org>
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

Hi Robert,

On Tue, Mar 31, 2020 at 10:37 AM Robert Foss <robert.foss@...aro.org> wrote:

> After testing this change, it breaks the driver during probing.

Why exactly does it break probing? Maybe the GPIO polarity defined in
the device tree is wrong?

> I had a quick look into GPIOD_OUT_HIGH & LOW definitions, and they
> seem to never be 0 or 1.

If you do a grep in all gpiod_set_value_cansleep() usages in the
kernel tree, there is not a single case where  GPIOD_OUT_HIGH or
GPIOD_OUT_LOW is passed as argument of gpiod_set_value_cansleep().