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From: Linus Walleij <>
Cc: "open list:GPIO SUBSYSTEM" <>,
	"" <>,
Subject: Re: [PATCH] pinctrl: generic: Avoid several implicit enum conversions
Date: Tue, 25 Sep 2018 12:58:16 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

On Tue, Sep 25, 2018 at 8:19 AM Nathan Chancellor
<> wrote:

> Clang warns when one enumerated type is implicitly converted to another,
> which happens several times in the pinctrl drivers for a few reasons:
> * The PCONFDUMP macro, which sets the param member in pin_config_item.
> * The pinconf_generic_params structure, which is used by drivers to
>   configure their bindings, which has a param member like pin_config_item.
> * The pinconf_to_config_packed, which takes either the generic enum
>   pin_config_param or a specialized one.
> Drivers are allowed to extend this enumerated type because of the gap
> betweem PIN_CONFIG_END and PIN_CONFIG_MAX. Make it clear to Clang that
> this is allowed by changing param's type in all of these instances to
> int so no conversion needs to happen.
> Link:
> Signed-off-by: Nathan Chancellor <>

I'm not superhappy about this because that enum is great for readability,
even if the static syntax checker is unhappy.

If we can't have an enum here I would argue that we can just as well
remove the enum altogether and just use #define for the config
parameters, would you agree?

Linus Walleij

  reply	other threads:[~2018-09-25 10:58 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-09-25  6:18 Nathan Chancellor
2018-09-25 10:58 ` Linus Walleij [this message]
2018-09-25 16:14   ` Nathan Chancellor
2018-09-25 16:23     ` Nick Desaulniers
2018-10-25 21:04       ` Nathan Chancellor
2018-10-31 13:33         ` Linus Walleij
2018-11-01  0:03           ` Nathan Chancellor
2018-11-01 11:46             ` David Laight
2018-11-09  9:29             ` Linus Walleij
2018-11-09 15:21               ` Nathan Chancellor

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