linux-kernel - Re: [PATCH] pinctrl: max77620: Use define directive for max77620_pinconf

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Date:   Fri, 9 Nov 2018 10:01:53 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Nathan Chancellor <natechancellor@...il.com>,
        Laxman Dewangan <ldewangan@...dia.com>
Cc:     "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] pinctrl: max77620: Use define directive for
 max77620_pinconf_param values

On Thu, Nov 1, 2018 at 1:51 AM Nathan Chancellor
<natechancellor@...il.com> wrote:

> Clang warns when one enumerated type is implicitly converted to another:
>
> drivers/pinctrl/pinctrl-max77620.c:56:12: warning: implicit conversion
> from enumeration type 'enum max77620_pinconf_param' to different
> enumeration type 'enum pin_config_param' [-Wenum-conversion]
>                 .param = MAX77620_ACTIVE_FPS_SOURCE,
>                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
>
> It is expected that pinctrl drivers can extend pin_config_param because
> of the gap between PIN_CONFIG_END and PIN_CONFIG_MAX so this conversion
> isn't an issue. Most drivers that take advantage of this define the
> PIN_CONFIG variables as constants, rather than enumerated values. Do the
> same thing here so that Clang no longer warns.
>
> Link: https://github.com/ClangBuiltLinux/linux/issues/139
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Patch tentatively applied.

This seems to be the direction we need to be going with a lot
of CLANG business.

Laxman: you weren't CCed, so tell us if you dislike it for some
reason.

Yours,
Linus Walleij