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

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Date:   Thu, 16 Mar 2017 16:28:45 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Krzysztof Kozlowski <krzk@...nel.org>
Cc:     Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        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 Tue, Mar 14, 2017 at 2:58 PM, Krzysztof Kozlowski <krzk@...nel.org> wrote:
> On Tue, Mar 14, 2017 at 3:44 PM, Linus Walleij <linus.walleij@...aro.org> wrote:
>> On Thu, Feb 23, 2017 at 6:23 PM, Charles Keepax
>> <ckeepax@...nsource.wolfsonmicro.com> wrote:
>>> On Wed, Feb 22, 2017 at 03:37:37PM +0100, Linus Walleij wrote:
>>>> 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.
>>>>
>>>
>>> Apologies but I think you might be best to drop this patch for
>>> now, it seems this causes the ranges passed to
>>> pinctrl_add_gpio_range to have the wrong .base, whilst I can
>>> actually see no ill effects from this on Arndale. I suspect this
>>> patch may be only part of the solution and may potentially cause
>>> issues for others even though it seems fine for me.
>>
>> OK I dropped it.
>>
>> Resend it if you figure it out.
>>
>> The Samsung driver traffic is increasing, and there are now
>> a bunch of developers starting to step on each others' toes.
>>
>> Would you Samsung developers start considering someone who
>> can collect Samsung pin control patches and send them as
>> pull requests to me?
>
> For some reason, some days ago I had impression that Sylwester is
> doing this already... but I was corrected that you are taking them
> directly. If Tomasz and Sylwester are willing to do this, they got my
> Ack.
>
> If not, I can take it and set a separate repo on my kernel.org account.

That would be great, if there will be a lot of Samsung pin control work
for this kernel cycle.

Yours,
Linus Walleij