linux-kernel - Re: [RFC/RFT PATCH] pinctrl: bcm2835: don't -EINVAL on alternate funcs from get

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Message-ID: <CACRpkdYeBM6V+61-cbX1g_wLAVHvQQrtPb=5qjTdUw--+J+E4g@mail.gmail.com>
Date: Tue, 4 Mar 2025 08:53:03 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Florian Fainelli <florian.fainelli@...adcom.com>, Ray Jui <rjui@...adcom.com>, 
	Scott Branden <sbranden@...adcom.com>, 
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>, Stefan Wahren <wahrenst@....net>, 
	Liao Chen <liaochen4@...wei.com>, Chen-Yu Tsai <wens@...e.org>, Mark Brown <broonie@...nel.org>, 
	Marek Szyprowski <m.szyprowski@...sung.com>, linux-gpio@...r.kernel.org, 
	linux-rpi-kernel@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, 
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [RFC/RFT PATCH] pinctrl: bcm2835: don't -EINVAL on alternate
 funcs from get_direction()

On Wed, Feb 19, 2025 at 11:27 AM Bartosz Golaszewski <brgl@...ev.pl> wrote:

> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
>
> Since commit 9d846b1aebbe ("gpiolib: check the return value of
> gpio_chip::get_direction()") we check the return value of the
> get_direction() callback as per its API contract. This driver returns
> -EINVAL if the pin in question is set to one of the alternative
> (non-GPIO) functions. This isn't really an error that should be
> communicated to GPIOLIB so default to returning the "safe" value of
> INPUT in this case. The GPIO subsystem does not have the notion of
> "unknown" direction.
>
> Fixes: 9d846b1aebbe ("gpiolib: check the return value of gpio_chip::get_direction()")
> Reported-by: Mark Brown <broonie@...nel.org>
> Closes: https://lore.kernel.org/all/Z7VFB1nST6lbmBIo@finisterre.sirena.org.uk/
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Patch applied!

Yours,
Linus Walleij