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SubjectRe: [RFC v2] gpio/omap: auto-setup a GPIO when used as an IRQ
On Tuesday 24 September 2013 09:10 PM, Tony Lindgren wrote:
> * Javier Martinez Canillas <javier.martinez@collabora.co.uk> [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.



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