dma: mv_xor: allow channels to be registered directly from the main device

Extend the XOR engine driver (currently called "mv_xor_shared") so
that XOR channels can be passed in the platform_data structure, and be
registered from there.

This will allow the users of the driver to be converted to the single
platform_driver variant of the mv_xor driver.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

include/linux/platform_data/dma-mv_xor.h

@@ -20,5 +20,8 @@ struct mv_xor_platform_data {
 	size_t				pool_size;
 };
 
+struct mv_xor_shared_platform_data {
+	struct mv_xor_platform_data    *channels;
+};
 
 #endif