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

[Santosh Shilimkar <santosh.shilimkar-l0cyMroinI0@public.gmane.org>]

On Tuesday 24 September 2013 11:45 AM, Balaji T K wrote:
> On Tuesday 24 September 2013 09:10 PM, Tony Lindgren wrote:
>> * Javier Martinez Canillas <javier.martinez-ZGY8ohtN/8pPYcu2f3hruQ@public.gmane.org> [130924 01:06]:
>>> 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.
>>
>> Also please mention the regression that this fixes. So far we know
>> that smsc911x for tobi and igep boards in mainline, and also the
> 
>> MMC card detect for omap4 boards.
> Hi Tony,
> 
> Card detect on omap4 board (sdp and panda) is not based on omap gpio,
> so I think this fix is not applicable for omap4.
> 
> Card detect line for SD card goes to power IC on OMAP4 panda and SDP.
> 
I confused Tony mostly. It was OMAP4 SPI based ethernet which uses the
GPIO as an interrupt line.

So for Panda, its Ethernet driver and not MMC.

Regards,
Santosh

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