[PATCHv2 2/2] gpio: mvebu: fix gpio bank registration when pwm is used

[Linus Walleij]

On Thu, Jun 1, 2017 at 2:18 PM, Richard Genoud <richard.genoud at gmail.com> wrote:

> If more than one gpio bank has the "pwm" property, only one will be
> registered successfully, all the others will fail with:
> mvebu-gpio: probe of f1018140.gpio failed with error -17
>
> That's because in alloc_pwms(), the chip->base (aka "int pwm"), was not
> set (thus, ==0) ; and 0 is a meaningful start value in alloc_pwm().
> What was intended is mvpwm->chip->base = -1.
> Like that, the numbering will be done auto-magically
>
> Moreover, as the region might be already occupied by another pwm, we
> shouldn't force:
> mvpwm->chip->base = 0
> nor
> mvpwm->chip->base = id * MVEBU_MAX_GPIO_PER_BANK;
>
> Tested on clearfog-pro (Marvell 88F6828)
>
> Fixes: 757642f9a584 ("gpio: mvebu: Add limited PWM support")
> Signed-off-by: Richard Genoud <richard.genoud at gmail.com>

Patch applied for fixes with Gregory's review tag.

Yours,
Linus Walleij