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

[Balaji T K]

On Tuesday 24 September 2013 09:10 PM, Tony Lindgren wrote:
> * Javier Martinez Canillas <javier.martinez@xxxxxxxxxxxxxxx> [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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