Re: [PATCH] pinctrl: at91-pio4: implement .get_multiple and .set_multiple

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

On Wed, Sep 11, 2019 at 10:11 AM Alexandre Belloni
<alexandre.belloni@xxxxxxxxxxx> wrote:
> On 11/09/2019 01:27:10+0100, Linus Walleij wrote:

> > > +#if ATMEL_PIO_NPINS_PER_BANK != BITS_PER_LONG
> >
> > Should it not be > rather than != ?
>
> Realistically, the only case that could happen would be
> ATMEL_PIO_NPINS_PER_BANK == 32 and BITS_PER_LONG ==64. so I would go for
> ATMEL_PIO_NPINS_PER_BANK < BITS_PER_LONG

OK I see.

> > > +               word = BIT_WORD(bank * ATMEL_PIO_NPINS_PER_BANK);
> > > +               offset = bank * ATMEL_PIO_NPINS_PER_BANK % BITS_PER_LONG;
> > > +#endif
> >
> > This doesn't look good for multiplatform kernels.
>
> I don't think we have multiplatform kernels that run both in 32 and 64
> bits. I don't believe ATMEL_PIO_NPINS_PER_BANK will ever change, it has
> been 32 on all the atmel SoCs since 2001.

So there is a bit missing from the commit message: the info that
the same driver is being used on 32 and 64 bit builds, and that is
the reason we allow compile-time ifdef things.

Can you add this to the commit message, or maybe
inline in the code, or both?

It confused me so it will confuse others.

Yours,
Linus Walleij