linux-kernel - Re: [PATCH] leds: lm355x: avoid enum conversion warning

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Date:   Thu, 4 Jun 2020 15:28:12 +0200
From:   Pavel Machek <pavel@....cz>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Nathan Chancellor <natechancellor@...il.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Bryan Wu <bryan.wu@...onical.com>,
        "G.Shark Jeong" <gshark.jeong@...il.com>,
        Dan Murphy <dmurphy@...com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-leds@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        clang-built-linux <clang-built-linux@...glegroups.com>
Subject: Re: [PATCH] leds: lm355x: avoid enum conversion warning

Hi!

> > > -             reg_val = pdata->pass_mode;
> > > +             reg_val = (u32)pdata->pass_mode;
> >
> > Is this cast needed? I don't think there should be warning from going
> > from an enumerated type to unsigned int.
> 
> This cast is not needed for warnings, I added it for consistency because
> it seemed odd to cast only four of the five enums. I can remove if though
> if you think it's clearer without the cast.
> 
> There may also be a different solution in completely removing the
> lm355x_chip_init() function, as it was added at a time when we
> were converting the last board files into devicetree, and there has
> never been a board file defining lm355x_platform_data.
> 
> There is unfortunately no DT support either in it, so I assume we
> could just remove the driver completely, or change it to use a
> DT binding similar to
> Documentation/devicetree/bindings/leds/leds-lm36*.txt
> 
> LED maintainers, any opinions on this?

I believe it is too soon to remove the driver; even if new user will
have to add DT support, that is less work than starting from scratch.

I guess I'll just apply your patch to squelch the warnings.

Best regards,
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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