Add a U-Boot RNG driver for Microchip's PolarFire SoC (MPFS). The
hardware RNG is accessed indirectly via the MPFS system controller using
the mailbox interface.
The driver implements the UCLASS_RNG interface, requesting random data
from the system controller and returning it to the caller.
This allows use of the PolarFire SoC hardware RNG via the
standard 'rng' command and DM RNG API.
Signed-off-by: Jamie Gibbons <jamie.gibbons@microchip.com>
Reviewed-by: Leo Yu-Chi Liang <leo.liang@sifive.com>
Jamie GibbonsandLeo Yu-Chi Liang
c58dc99616