Enable buttons GPIO passthrough

[Linus Walleij]

Hi Kwin,

On Wed, Jan 16, 2019 at 3:30 PM Wang, Kuiying <kuiying.wang at intel.com> wrote:

> Hi Joel,
> Do agree to use proposal #1? (extend "passthrough" to the "direction" property of gpio, use  "value" to control it be disabled/enabled.)
>
> All,
> Any other comments?

I think you maybe misunderstood my previous mail, or I misunderstood yours :)

Make sure that passthrough mode is set up in the .set_config() callback,
nothing else.

Do not change the signatures of the direction functions or set_value()
functions in gpiolib.

But maybe you are talking about implementation details in the specific
GPIO driver for Aspeed? Then I just missed that part, sorry.

Yours,
Linus Walleij