tree 6483f6d9e727f44ff83737235a0cb9a13535d7e0
parent 9737fab600b951ac080355b3f96d053e1ea84fd4
author Sughosh Ganu <sughosh.ganu@linaro.org> 1658505725 +0530
committer Ilias Apalodimas <ilias.apalodimas@linaro.org> 1659473402 +0300

tpm: Add the RNG child device

The TPM device comes with the random number generator(RNG)
functionality which is built into the TPM device. Add logic to add the
RNG child device in the TPM uclass post probe callback.

The RNG device can then be used to pass a set of random bytes to the
linux kernel, need for address space randomisation through the
EFI_RNG_PROTOCOL interface.

No compatible string is provided because this is not available in
the binding defined by Linux. If multiple rand devices are in the
system, then some method of selecting them (other than device tree)
will need to be used, or a binding will need to be added.

Signed-off-by: Sughosh Ganu <sughosh.ganu@linaro.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>