linux-kernel - Re: [PATCH 1/7] selftests: gpio: rework and simplify test implementation

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Message-ID: <20210104152319.GA854268@sol>
Date:   Mon, 4 Jan 2021 23:23:19 +0800
From:   Kent Gibson <warthog618@...il.com>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Shuah Khan <shuah@...nel.org>,
        Bamvor Jian Zhang <bamv2005@...il.com>
Subject: Re: [PATCH 1/7] selftests: gpio: rework and simplify test
 implementation

On Mon, Jan 04, 2021 at 11:00:31PM +0800, Kent Gibson wrote:
> On Mon, Jan 04, 2021 at 03:52:49PM +0200, Andy Shevchenko wrote:
> > On Mon, Jan 4, 2021 at 3:51 AM Kent Gibson <warthog618@...il.com> wrote:
> > > On Sun, Jan 03, 2021 at 05:10:10PM +0200, Andy Shevchenko wrote:
> > 
> > ...
> > 
> > > In this example it is the 508:
> > >
> > > # e.g. gpiochip0: GPIOs 508-511, parent: platform/gpio-mockup.0, gpio-mockup-A:
> > >
> > > So I'll use that - unless it is unreliable for some reason?
> > 
> > debugfs is not an ABI and tomorrow this can be changed without notice.
> > 
> 
> I had a bad feeling that might be the case, and all my current solutions
> use debugfs one way or another, so back to the drawing board on that one.
> 

Hang on - the find approach that I was looking at previously only uses
/sys/devices/platform, so I'll revert to that one - and add handling for
multi-match.

Cheers,
Kent.