linux-kernel - Re: [PATCH] pinctrl: sprd: Use define directive for sprd_pinconf

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Date:   Thu, 1 Nov 2018 13:57:42 +0800
From:   Baolin Wang <baolin.wang@...aro.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>
Subject: Re: [PATCH] pinctrl: sprd: Use define directive for
 sprd_pinconf_params values

On 1 November 2018 at 08:44, Nathan Chancellor <natechancellor@...il.com> wrote:
> Clang warns when one enumerated type is implicitly converted to another:
>
> drivers/pinctrl/sprd/pinctrl-sprd.c:845:19: warning: implicit conversion
> from enumeration type 'enum sprd_pinconf_params' to different
> enumeration type 'enum pin_config_param' [-Wenum-conversion]
>         {"sprd,control", SPRD_PIN_CONFIG_CONTROL, 0},
>         ~                ^~~~~~~~~~~~~~~~~~~~~~~
> drivers/pinctrl/sprd/pinctrl-sprd.c:846:22: warning: implicit conversion
> from enumeration type 'enum sprd_pinconf_params' to different
> enumeration type 'enum pin_config_param' [-Wenum-conversion]
>         {"sprd,sleep-mode", SPRD_PIN_CONFIG_SLEEP_MODE, 0},
>         ~                   ^~~~~~~~~~~~~~~~~~~~~~~~~~
>
> 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/138
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>
> ---

Looks reasonable to me. Thanks.
Reviewed-by: Baolin Wang <baolin.wang@...aro.org>

-- 
Baolin Wang
Best Regards