[PATCH 1/2] dmaengine: omap: hide filter_fn for built-in drivers

[Tony Lindgren]

* Arnd Bergmann <arnd at arndb.de> [140508 07:57]:
> It is not possible to reference the omap_dma_filter_fn filter
> function from a built-in driver if the dmaengine driver itself
> is a loadable module, which is a valid configuration otherwise.
> 
> This provides only the dummy alternative if the function
> is referenced by a built-in driver to allow a successful
> build. The filter function is only required by ATAGS based
> platforms, which will continue to be broken after this change
> for the bogus configuration. When booting from DT, with the
> dma channels correctly listed there, it will work fine.
> 
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
Acked-by: Tony Lindgren <tony at atomide.com>
> Cc: Russell King <rmk+kernel at arm.linux.org.uk>
> Cc: Vinod Koul <vinod.koul at intel.com>
> Cc: dmaengine at vger.kernel.org