ARM: mxs: Document the power block initialization

This patch adds documentation for the functions used during the
initialization of MXS power block.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Stefano Babic <sbabic@denx.de>
1 file changed