linux-kernel - Re: [PATCH] rtc: bd70528: fix BD71815 watchdog dependency

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Date:   Thu, 22 Apr 2021 17:16:51 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Lee Jones <lee.jones@...aro.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-rtc@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rtc: bd70528: fix BD71815 watchdog dependency

On Thu, Apr 22, 2021 at 4:23 PM Guenter Roeck <linux@...ck-us.net> wrote:

> >
> >  config RTC_DRV_BD70528
> >       tristate "ROHM BD70528, BD71815 and BD71828 PMIC RTC"
> > -     depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528 && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
> > +     depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528 || BD70528_WATCHDOG
>
> Is the "|| BD70528_WATCHDOG" above correct ? Seems odd to me, since
> it makes the depend statement true even if neither MFD_ROHM_BD71828
> nor MFD_ROHM_BD70528 is enabled.
>
> I think the condition needs to be something like
>         depends on (MFD_ROHM_BD71828 || MFD_ROHM_BD70528) && (BD70528_WATCHDOG || !BD70528_WATCHDOG)
> or, in two lines,
>         depends on MFD_ROHM_BD71828 || MFD_ROHM_BD70528
>         depends on BD70528_WATCHDOG || !BD70528_WATCHDOG

Indeed, I misread this as being used on any of three drivers, but
MFD_ROHM_BD70528/BD70528_WATCHDOG is really the same
thing.

I sent an updated patch.

        Arnd