linux-kernel - RE: [PATCH] pinctrl: generic: Avoid several implicit enum conversions

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Date:   Thu, 1 Nov 2018 11:46:25 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Nathan Chancellor' <natechancellor@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>
CC:     Nick Desaulniers <ndesaulniers@...gle.com>,
        "open list:GPIO SUBSYSTEM" <linux-gpio@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] pinctrl: generic: Avoid several implicit enum conversions

From: Nathan Chancellor
> Sent: 01 November 2018 00:04
...
> > A slightly lesser evil variant is to add a few PIN_CONFIG_CUSTOM_1
> > PIN_CONFIG_CUSTOM_2 etc at the end of the enum and just
> > #define MY_CONFIG PIN_CONFIG_CUSTOM_1
> > in all drivers that use these.
> >
> 
> Some drivers actually just define their pin config params like:
> 
> #define VAR (PIN_CONFIG_END + 1)

You probably want to add 'custom' definitions after PIN_CONFIG_END
so that a future compiler versions doesn't generate an error
because (PIN_CONFIG_END + 1) isn't a valid value for the enum.

	David

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