On Sat, Jul 31, 2021 at 09:48:43PM +0100, Andre Przywara wrote:

The "Arm True Random Number Generator Firmware Interface"[1] provides
an SMCCC based interface to a true hardware random number generator.
So far we are using that in arch_get_random_seed(), but it might be
useful to expose the entropy through the /dev/hwrng device as well. This
allows to assess the quality of the implementation, by using "rngtest"
from the rng-tools package, for example.

Reviewed-by: Mark Brown <broonie@kernel.org>