Add the driver, link it into the kbuild system and provide device tree
binding documentation.
Signed-off-by: NDavid Daney <david.daney@cavium.com>
Acked-by: NGrant Likely <grant.likely@secretlab.ca>
Patchwork: http://patchwork.linux-mips.org/patch/4292/Signed-off-by: NJohn Crispin <blogic@openwrt.org>