Re: [PATCH 2/2] PCI: mvebu: switch to using gpiod API

[Linus Walleij <linus.walleij@linaro.org>]

On Wed, Sep 7, 2022 at 12:41 AM Dmitry Torokhov
<dmitry.torokhov@gmail.com> wrote:

> Linus, do you think we should introduce GPIOD_OUT_INACTIVE /
> GPIOD_OUT_ACTIVE or GPIOD_OUT_DEASSERTED / GPIOD_OUT_ASSERTED and
> deprecate existing GPIOD_OUT_LOW and GPIO_OUT_HIGH?

They should rather be replaced everywhere in one go.

I think it is just a half-measure unless we also add
#define GPIOD_ASSERTED 1
#define GPIOD_DEASSERTED 0
to be used instead of 1/0 in gpiod_set_value().

It would also imply changing the signature of the function
gpiod_set_value() to gpiod_set_state() as we are not
really setting a value but a state.

I have thought about changing this, but the problem is that I felt
it should be accompanied with a change fixing as many users
as possible.

I think this is one of those occasions where we should merge
the new defines, and then send Linus Torvalds a sed script
that he can run at the end of the merge window to change all
gpiod_set_value(...., 1) -> gpiod_set_state(...., GPIOD_ASSERTED);
everywhere.

After all users are changed, the GPIOD_ASSERTED/DEASSERTED
defined can be turned into an enum.

That would be the silver bullet against a lot of confusion IMO.

We would need Bartosz' input on this.

Yours,
Linus Walleij