Re: [PATCH 01/14] gpio: pca953x: move suspend/resume to suspend_noirq/resume_noirq

[Linus Walleij]

On Fri, Jan 19, 2024 at 6:01 PM Thomas Richard
<thomas.richard@xxxxxxxxxxx> wrote:
> On 1/16/24 08:43, Tony Lindgren wrote:
> > * Thomas Richard <thomas.richard@xxxxxxxxxxx> [240115 16:16]:
> >> Some IOs can be needed during suspend_noirq/resume_noirq.
> >> So move suspend/resume callbacks to noirq.
> >
> > So have you checked that the pca953x_save_context() and restore works
> > this way? There's i2c traffic and regulators may sleep.. I wonder if
> > you instead just need to leave gpio-pca953x enabled in some cases
> > instead?
> >
>
> Yes I tested it, and it works (with my setup).
> But this patch may have an impact for other people.
> How could I leave it enabled in some cases ?

I guess you could define both pca953x_suspend() and
pca953x_suspend_noirq() and selectively bail out on one
path on some systems?

Worst case using if (of_machine_is_compatible("my,machine"))...

Yours,
Linus Walleij