linux-kernel - Re: [PATCH v2 2/4] pinctrl: samsung: Register pinctrl before GPIO

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Date:   Wed, 22 Feb 2017 15:37:37 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Tomasz Figa <tomasz.figa@...il.com>,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "open list:WOLFSON MICROELECTRONICS DRIVERS" 
        <patches@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH v2 2/4] pinctrl: samsung: Register pinctrl before GPIO

On Thu, Feb 16, 2017 at 2:27 PM, Charles Keepax
<ckeepax@...nsource.wolfsonmicro.com> wrote:

> If we request a GPIO hog, then gpiochip_add_data will attempt to request
> some of its own GPIOs. The driver also uses gpiochip_generic_request
> which means that for any GPIO request to succeed the pinctrl needs to be
> registered. Currently however the driver registers the GPIO and then the
> pinctrl meaning all GPIO hog requests will fail, which then in turn causes
> the whole driver to fail probe. Fix this up by ensuring we register the
> pinctrl first. Although currently there are no users of GPIO hogs in
> mainline there are plenty of Samsung based boards that are widely used
> for development purposes of other hardware. Indeed we hit this issue
> whilst attaching some additional hardware to an Arndale system.
>
> Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
> Reviewed-by: Krzysztof Kozlowski <krzk@...nel.org>
> ---
>
> Changes since v1:
>  - Updated commit message

Patch applied. Will not be visible in -next until after the merge window
though.

Yours,
Linus Walleij