linux-kernel - Re: [PATCH] gpiolib: Take MUX usage into account

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Message-ID: <2F7B6E95-045E-4F57-B2CB-858BEE298986@gmail.com>
Date:   Tue, 06 Aug 2019 22:54:48 +0300
From:   Ramon Fried <rfried.dev@...il.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>,
        Stefan Wahren <stefan.wahren@...e.com>
Subject: Re: [PATCH] gpiolib: Take MUX usage into account



On August 6, 2019 4:11:27 PM GMT+03:00, Linus Walleij <linus.walleij@...aro.org> wrote:
>On Tue, Aug 6, 2019 at 3:04 PM Linus Walleij <linus.walleij@...aro.org>
>wrote:
>> On Sat, Aug 3, 2019 at 3:34 PM Ramon Fried <rfried.dev@...il.com>
>wrote:
>>
>> > From: Stefan Wahren <stefan.wahren@...e.com>
>> >
>> > The user space like gpioinfo only see the GPIO usage but not the
>> > MUX usage (e.g. I2C or SPI usage) of a pin. As a user we want to
>know which
>> > pin is free/safe to use. So take the MUX usage of strict pinmux
>controllers
>> > into account to get a more realistic view for ioctl
>GPIO_GET_LINEINFO_IOCTL.
>> >
>> > Signed-off-by: Stefan Wahren <stefan.wahren@...e.com>
>> > Tested-By: Ramon Fried <rfried.dev@...il.com>
>> > Signed-off-by: Ramon Fried <rfried.dev@...il.com>
>> > ---
>> > Sending Stefan's RFC as patch, as I tested it and it seems to work,
>> > additionally, an accompanying fix was made by me to gpiolibd to fix
>a
>> > display error of the actual result:
>> > https://patchwork.ozlabs.org/patch/1139923/
>>
>> This is mostly fine, some style nits so I fixed it up when
>> applying.
>
>Ooops no. It needs a deeper rework in accordance to my comments
>last time it was posted. Please read this reply to Stefan's patch
>and address the comments:
>
NP, I'll try to address these in a new patch. 
Thanks. 
Ramon 
>https://lore.kernel.org/linux-gpio/CACRpkdb5DjAMRYkT+b0U6HVk7E6ccLT79-LB=QGQWWtE17aPUg@mail.gmail.com/
>
>Yours,
>Linus Walleij

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