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

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Message-ID: <CACRpkdb_zHuTshzaHYUbkEnSdYhk1Moyu1QWTRzwXOELLNoV1A@mail.gmail.com>
Date:   Fri, 9 Nov 2018 10:21:47 +0100
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Orson Zhai <orsonzhai@...il.com>,
        Baolin Wang <baolin.wang@...aro.org>,
        Lyra Zhang <zhang.lyra@...il.com>,
        "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: sprd: Use define directive for
 sprd_pinconf_params values

On Thu, Nov 1, 2018 at 1:44 AM 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.

Patch applied with Baolin's review tag.

Yours,
Linus Walleij