linux-kernel - Re: [PATCH 2/2] gpiolib: cdev: export the consumer's PID

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Message-ID: <YyC4zq2YEmzQMkBL@smile.fi.intel.com>
Date:   Tue, 13 Sep 2022 20:07:26 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Kent Gibson <warthog618@...il.com>
Cc:     Bartosz Golaszewski <brgl@...ev.pl>,
        Linus Walleij <linus.walleij@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] gpiolib: cdev: export the consumer's PID

On Wed, Sep 14, 2022 at 12:17:39AM +0800, Kent Gibson wrote:
> On Tue, Sep 13, 2022 at 05:58:32PM +0200, Bartosz Golaszewski wrote:
> > On Tue, Sep 13, 2022 at 4:55 PM Kent Gibson <warthog618@...il.com> wrote:

...

> > We'd need of course first expose that info like:
> > 
> > gpio chip:gpiochip2 lines:0,3,4,7
> > 
> > Does that make sense?
> 
> Makes sense to me, though I don't claim to know anything about fdinfo
> field formatting.
> 
> e.g. I also see fdinfo fields like this:
> 
> eventfd-count:                0
> eventfd-id: 1
> 
> so
> 
> gpio-chip:  gpiochip2
> gpio-lines: 0,3,4,7
> 
> might be ok too.

Always think about two or more GPIO chips in the same process with 1 or more
lines requested from each of them.

-- 
With Best Regards,
Andy Shevchenko