linux-kernel - Re: [PATCH 0/7] gpio: mockup: extensions for testing purposes

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Date:   Tue, 31 Jan 2017 14:28:44 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     Alexandre Courbot <gnurou@...il.com>,
        Bamvor Jian Zhang <bamvor.zhangjian@...aro.org>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/7] gpio: mockup: extensions for testing purposes

On Wed, Jan 25, 2017 at 4:34 PM, Bartosz Golaszewski
<bgolaszewski@...libre.com> wrote:

> This series proposes to extend the gpio framework by allowing to
> inject line events from the kernel code and by providing a debugfs
> interface for that to the gpio-mockup driver. We also allow the
> user to request that the mockup driver name the lines.

I sympathize fully with the goal and intentions of the series, I
agree: this is awesome to have for testing and validation of
GPIO.

I'm reluctant about the changes to gpiolib and want to make that
code as optional as possible, definately #ifdef if nothing else
works. Otherwise the memory footprint people will get me for this,
haha. ;)

The absolutely best would be if the driver could inject "real"
irqs and also exercise the gpiolib irqchip helpers. I have been
vaguely thinking that sofware interrupts should be able to do this
but I'm not very versed in that kind of stuff.

The changes to gpio-mockup.c are entirely uncontroversial, it
is for testing so I'm willing to accept almost anything if it looks
maintainable and helps in testing.

Yours,
Linus Walleij