Re: [PATCH v5 1/2] mfd: arizona: Update reset pin to use GPIOD

[Linus Walleij]

On Mon, Mar 12, 2018 at 4:52 PM, Charles Keepax
<ckeepax@xxxxxxxxxxxxxxxxxxxxx> wrote:

> Now GPIOD has support for both pdata systems and for non-standard DT
> bindings the Arizona reset GPIO can be converted to use it. Worth
> noting gpiod_set_raw_value_cansleep is used to match the behaviour
> of the old GPIOs. This is because the part is fairly widely used and
> it is unknown how many DTs are correctly setting active low through
> device tree, so to avoid breaking any existing users it is best to
> match the previous behaviour.
>
> Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxx>
> ---
>
> Changes since v4:
>  - Don't use a switch statement for handling return values
>  - Add some comments to the handling for the older binding
>  - Use gpiod_set_raw_value_cansleep to avoid potential breakage
>
> I have also removed Linus's reviewed-by was a bit border line but
> I felt there have probably been enough code changes since he gave
> it that it was probably safer to remove it.

It's fine.
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>

The use of gpiod_set_raw* should be done with caution, but this
is one of the cases where we need to take out the big hammer to
make sure things stay compatible.

I haven't read why it is like so but I guess because the right flags
in the device tree can not be guaranteed?

Yours,
Linus Walleij