linux-kernel - Re: [PATCH 00/14] gpiolib: indicate errors in value setters

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Message-ID: <CAMRc=McEgpm+rafr64N-NeOEqk9OzwaEb=7u5ZXQ6vwnQBgyTQ@mail.gmail.com>
Date: Fri, 14 Feb 2025 11:14:45 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Linus Walleij <linus.walleij@...aro.org>
Cc: Michael Walle <mwalle@...nel.org>, Bamvor Jian Zhang <bamv2005@...il.com>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Keerthy <j-keerthy@...com>, 
	Uwe Kleine-König <ukleinek@...nel.org>, 
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pwm@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 00/14] gpiolib: indicate errors in value setters

On Fri, Feb 14, 2025 at 10:56 AM Linus Walleij <linus.walleij@...aro.org> wrote:
>
> On Tue, Feb 11, 2025 at 1:10 PM Bartosz Golaszewski <brgl@...ev.pl> wrote:
>
> > The value setter callbacks (both for single and multiple lines) return
> > void even though we have many types of controllers that can fail to set
> > a line's value: i2c, SPI, USB, etc.
>
> Yeah this is a remnant from the design that was done of gpiolib,
> at the time (by David Brownell) assumed to be simple MMIO register
> writes, so not much could go wrong there.
>
> > This series proposes to start the process of converting the setters to
> > returning int thus making it possible to propagate any errors to the
> > user.
>
> My worry is that this project will be another one that stalls at
> 85% completion (like with the eternal descriptor rewrite project)
> but I guess the upside outweighs the downside, and I also trust
> your proven grittiness so:
>

Unlike the descriptor API, the changes here are quite trivial. There
are about 350 drivers that need changing but can be done relatively
fast.

Bart

> Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
> for the series +/- minor nitpicks I may send that I am sure
> you would address anyway.
>
> Yours,
> Linus Walleij