linux-kernel - Re: [PATCH v1 1/1] gpio: regmap: Use -ENOTSUPP consistently

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Date: Thu, 11 Apr 2024 14:26:54 +0300
From: Andy Shevchenko <andy.shevchenko@...il.com>
To: Michael Walle <mwalle@...nel.org>
Cc: linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org, 
	Linus Walleij <linus.walleij@...aro.org>, Bartosz Golaszewski <brgl@...ev.pl>
Subject: Re: [PATCH v1 1/1] gpio: regmap: Use -ENOTSUPP consistently

On Thu, Apr 11, 2024 at 1:46 PM Michael Walle <mwalle@...nel.org> wrote:
> On Wed Apr 10, 2024 at 8:39 AM CEST, Andy Shevchenko wrote:
> > The GPIO library expects the drivers to return -ENOTSUPP in some cases
> > and not using analogue POSIX code. Make the driver to follow this.
>
> I don't care too much, so if you like you can add
>
> Reviewed-by: Michael Walle <mwalle@...nel.org>

Thank you!

> But.. isn't it the wrong errno and isn't it discouraged to use it
> because it's a NFS only errno? Thus, wouldn't it make more sense for
> the core to accept EOPNOTSUPP and maybe convert it to ENOTSUPP if we
> don't want to break userspace?

We don't break user space as it is used purely internally to the GPIO
/ pin control subsystems (which are in our area of interest, unlike
plenty of other users).

The decision to have this error code had been made long time ago and
now somebody probably is welcome to update, but for the sake of
consistency let's continue what was done by design.

-- 
With Best Regards,
Andy Shevchenko