On Wed, 17 Feb 2016 12:58:20 +0100
Gabor Juhos [off-list ref] wrote:

The RB532 platform specific irq_to_gpio() implementation has been
removed with commit 832f5dacfa0b ("MIPS: Remove all the uses of
custom gpio.h"). Now the platform uses the generic stub which causes
the following error:

  pata-rb532-cf pata-rb532-cf: no GPIO found for irq149
  pata-rb532-cf: probe of pata-rb532-cf failed with error -2

Drop the irq_to_gpio() call and get the GPIO number from platform
data instead. After this change, the driver works again:

I think it would be preferable to move this driver to use the gpiod
API. The changes needed should be about the same size and it would
be a much more future proof fix.

Alban