Re: [PATCH 00/54] GPIO: clamp return values from drivers

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Tue, Dec 22, 2015 at 4:06 PM, Vladimir Zapolskiy
<vladimir_zapolskiy@xxxxxxxxxx> wrote:

> From a19047b2131f73cdf494abd44d76de6f57ca81ff Mon Sep 17 00:00:00 2001
> From: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>
> Date: Tue, 22 Dec 2015 16:37:28 +0200
> Subject: [PATCH] gpio: update gpiochip .get() callback description
>
> Since gpiochip .get() callback may return a negative error value, it
> strictly limits the range of possible non-error returned values to
> a subset of [30:0] bitmask, however on practice on success all
> gpiochip drivers return either 0 for low signal or 1 for high signal,
> this is assured by "gpio: *: Be sure to clamp return value" series of
> changes. To avoid any confusion, misinterpretation and potential
> errors while developing gpiochip drivers in future convert this
> implicit assumption to a mandatory rule.
>
> For output signals with unknown output signal state gpiochip drivers
> should return a negative error instead of 0.
>
> Signed-off-by: Vladimir Zapolskiy <vladimir_zapolskiy@xxxxxxxxxx>

Patch applied!

Merry Christmas,
Linus Walleij
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