tree a4f8dd89d5ec45049c7bc0c389ce59835e1bcb23
parent 6417a737b8b563c29d7ab8bd059a85a550610f99
author Simon Glass <sjg@chromium.org> 1495906637 -0600
committer Jaehoon Chung <jh80.chung@samsung.com> 1497007516 +0900

dm: blk: Add a way to obtain a block device from its parent

Many devices support a child block device (e.g. MMC, USB). Add a
convenient way to get this device given the parent device.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>