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From:   Andy Shevchenko <andy.shevchenko@gmail.com>
Date:   Fri, 22 Oct 2021 16:38:14 +0300
Message-ID: <CAHp75VditKnEcPKgqxz7NfG3ZWLZCu=pW=8qw7HS_iWePTj5Qw@mail.gmail.com>
Subject: Re: [PATCH v2 09/16] reset: starfive-jh7100: Add StarFive JH7100
 reset driver
To:     Emil Renner Berthing <kernel@esmil.dk>
Cc:     linux-riscv <linux-riscv@lists.infradead.org>,
        devicetree <devicetree@vger.kernel.org>,
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        "open list:GPIO SUBSYSTEM" <linux-gpio@vger.kernel.org>,
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        Paul Walmsley <paul.walmsley@sifive.com>,
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        Thomas Gleixner <tglx@linutronix.de>,
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        Linus Walleij <linus.walleij@linaro.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
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On Fri, Oct 22, 2021 at 4:35 PM Emil Renner Berthing <kernel@esmil.dk> wrote:
> On Fri, 22 Oct 2021 at 14:56, Andy Shevchenko <andy.shevchenko@gmail.com> wrote:
> > On Thu, Oct 21, 2021 at 8:43 PM Emil Renner Berthing <kernel@esmil.dk> wrote:

...

> > Why all these ugly % 32 against constants?
>
> Because the JH7100_RST_ values goes higher than 31. There is a
> BIT_MASK macro, but that does % BITS_PER_LONG and this is a 64bit
> machine.

And? It's exactly what you have to use!

...

> > Can you convert this to simple
> >
> >   if (assert)
> >     ret = readl_...
> >   else
> >     ret = readl_...
> >
> > below?
>
> I don't see how that would work. We're using the done value in in the
> readl_poll_timeout. Maybe you can be a bit more explicit.

Supply done either == mask or == ^mask. Try it.

-- 
With Best Regards,
Andy Shevchenko