Re: [RFC v2] gpio/omap: auto-setup a GPIO when used as an IRQ

[Javier Martinez Canillas <javier.martinez@collabora.co.uk>]

On 09/27/2013 01:18 AM, Stephen Warren wrote:
> On 09/24/2013 01:58 AM, Javier Martinez Canillas wrote:
>> The OMAP GPIO controller HW requires a pin to be configured in GPIO
>> input mode in order to operate as an interrupt input. Since drivers
>> should not be aware of whether an interrupt pin is also a GPIO or not,
>> the HW should be fully configured/enabled as an IRQ if a driver solely
>> uses IRQ APIs such as request_irq(), and never calls any GPIO-related
>> APIs. As such, add the missing HW setup to the OMAP GPIO controller's
>> irq_chip driver.
>> 
>> Since this bypasses the GPIO subsystem we have to ensure that another
>> caller won't be able to request the same GPIO pin that is used as an
>> IRQ and set its direction as output. Requesting the GPIO and setting
>> its direction as input is allowed though.
> 
> FWIW, the concept of this patch,
> Acked-by: Stephen Warren <swarren@nvidia.com>
> 
> I didn't review the code; just skimmed it to see where the new
> functionality was implemented.
> 

Thanks Stephen,

I split the changes as suggested by Tony and posted as a patch-set and not an
RFC anymore:

[PATCH 1/2] gpio/omap: maintain GPIO and IRQ usage separately [1]
[PATCH 2/2] gpio/omap: auto-setup a GPIO when used as an IRQ [2]

Linus,

Could you please add Stephen Acked-by when taking the patches and also George
Cherian Tested-by that sent for this RFC. George it would be great if you can
also comment on which OMAP platform you had tested.

I cc'ed Aaro Koskinen and Paul Walmsley now which seems to have OMAP1 platforms
to test. Could you please test [1] and [2] on a OMAP1 board? These patches
solves a long standing issue we have on OMAP2+ when booting with DT and it would
be great if you can check that it does not cause regressions on OMAP1 based boards.

Thanks a lot and best regards,
Javier

[1]: https://patchwork.kernel.org/patch/2937351/
[2]: https://patchwork.kernel.org/patch/2937371/