[PATCH v3 6/6] crypto/fsl: add RNG support

[Heinrich Schuchardt]

On 25.06.20 14:19, Michael Walle wrote:
> Register the random number generator with the rng subsystem in u-boot.
> This way it can be used by EFI as well as for the 'rng' command.
>
> Signed-off-by: Michael Walle <michael at walle.cc>
> ---
>  drivers/crypto/fsl/Kconfig   | 14 ++++++
>  drivers/crypto/fsl/Makefile  |  1 +
>  drivers/crypto/fsl/jobdesc.c | 10 +++++
>  drivers/crypto/fsl/jobdesc.h |  3 ++
>  drivers/crypto/fsl/jr.c      |  9 ++++
>  drivers/crypto/fsl/rng.c     | 86 ++++++++++++++++++++++++++++++++++++
>  6 files changed, 123 insertions(+)
>  create mode 100644 drivers/crypto/fsl/rng.c
>
> diff --git a/drivers/crypto/fsl/Kconfig b/drivers/crypto/fsl/Kconfig
> index 181a1e5e99..5ed6140da3 100644
> --- a/drivers/crypto/fsl/Kconfig
> +++ b/drivers/crypto/fsl/Kconfig
> @@ -45,3 +45,17 @@ config SYS_FSL_SEC_COMPAT
>
>  config SYS_FSL_SEC_LE
>  	bool "Little-endian access to Freescale Secure Boot"
> +
> +if FSL_CAAM
> +
> +config FSL_CAAM_RNG
> +	bool "Enable Random Number Generator support"
> +	depends on DM_RNG
> +	default y
> +	help
> +	  Enable support for the hardware based random number generator
> +	  module of the CAAM. The random data is fetched from the DRGB
> +	  using the prediction resistance flag which means the DRGB is
> +	  reseeded from the TRNG every time random data is generated.
> +
> +endif

Should FSL_CAAM imply DM_RNG? This way you would not have to update the
defconfigs of the NXP boards.

For new files there should be a maintainer. It would be great if
somebody at NXP could take charge of the drivers/crypto/fsl directory.

Best regards

Heinrich