Re: [PATCH v2] gpio: mmio: Also read bits that are zero

[Lukas Wunner <lukas@xxxxxxxxx>]

On Tue, Jan 16, 2018 at 12:00:31PM +0100, Linus Walleij wrote:
> +	bit = -1;
> +	while ((bit = find_next_bit(mask, gc->ngpio, bit + 1)) < gc->ngpio)
>  		readmask |= bgpio_line2mask(gc, bit);

Amend include/linux/bitrev.h with a bitrev64() macro.

Further amend it with a bitrevul() macro which calls bitrev32() or
bitrev(64) depending on the arch's unsigned long size.

Then use bitrevul() on mask and the rest is just OR/AND operations
(instead of the while loop).

Thanks,

Lukas
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