linux-kernel - Re: pinctrl: -EAGAIN not supported but documented

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Date:   Mon, 21 Jan 2019 16:27:57 +0200
From:   Ramon Fried <ramon.fried@...ux.intel.com>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Bartosz Golaszewski <bgolaszewski@...libre.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: pinctrl: -EAGAIN not supported but documented


On 1/21/19 4:26 PM, Linus Walleij wrote:
> On Mon, Jan 21, 2019 at 2:28 PM Ramon Fried <ramon.fried@...ux.intel.com> wrote:
>
>> Stated in Documentation/driver-api/pinctl.rst:
>>
>> Since some controllers have special logic for handling entire groups of pins
>> they can exploit the special whole-group pin control function. The
>> pin_config_group_set() callback is allowed to return the error code -EAGAIN,
>> for groups it does not want to handle, or if it just wants to do some
>> group-level handling and then fall through to iterate over all pins, in
>> which
>> case each individual pin will be treated by separate pin_config_set()
>> calls as
>> well.
>>
>> ----
>>
>> This is not supported, and there's no code for handling it.
>>
>> Should we add the necessary code or just remove the wrong documentation.
> The idea was removed in:
> commit ad42fc6c84795d19972e7f7dee70fe74bec4c2d8
> "pinctrl: rip out the direct pinconf API"
>
> I think we should just remove the documentation.
>
> Do you want me to look into it or do you want to send a patch?
>
> Yours,
> Linus Walleij

I'll send a patch shortly.

Thanks.

Ramon.