[PATCH 1/3] gpio: Add simple poweroff-gpio driver

[Linus Walleij]

On Thu, Nov 15, 2012 at 11:59 AM, Anton Vorontsov
<anton.vorontsov at linaro.org> wrote:
> On Thu, Nov 15, 2012 at 11:35:36AM +0100, Linus Walleij wrote:
>> On Mon, Nov 12, 2012 at 7:58 PM, Stephen Warren <swarren at wwwdotorg.org> wrote:
>> > On 11/12/2012 11:43 AM, Anton Vorontsov wrote:
>>
>> >> Should the gpio driver fix its bindings then?.. Polarity is a quite
>> >> generic concept of a GPIO, and flags are there for a reason. I'd rather
>> >> prefer having
>> >
>> > There is no "GPIO driver" to fix; each GPIO driver has its own bindings,
>> > and unfortunately, some of the GPIO binding authors chose not to include
>> > any flags cell in the GPIO specifier (e.g. Samsung ARM SoCs IIRC, but
>> > there are probably more).
>>
>> So can I read this something like we have been too liberal with the
>> GPIO DT bindings and they are now a bit messy and need to be shaped
>> up? I don't know how to achieve that :-(
>
> I guess there's really no reason to panic. :)
>
> 'git grep gpio-cells Documentation/' shows just mrvl-gpio.txt and
> twl6040.txt having the wrong gpio-cells (i.e. 1).
>
> But even these can use one cells for both flags and pin number (unless you
> really have 4294967295 GPIOs per controller).
>
> FWIW, current Samsung SOCs use 3 and even 4 cells for a GPIO specifier,
> which is absolutely fine. Plus, the Samsung bindings do specify the
> inversion flag. So, unless we have a lot of other [undocumented] bindings,
> I don't see a big mess. And everything I currently see is fixable.

I agree it's not that big a mess...

I was more thinking about how to convince the people who can
test this to fix it up.

Yours,
Linus Walleij