[PATCH] driver: rng: Add DM_RNG interface for ARMv8.5 RNDR registers

[Tom Rini]

On Wed, Aug 30, 2023 at 12:32:30PM +0100, Andre Przywara wrote:

> The ARMv8.5 architecture extension defines architectural RNDR/RNDRRS
> system registers, that provide 64 bits worth of randomness on every
> read. Since it's an extension, and implementing it is optional, there is
> a field in the ID_AA64ISAR0_EL1 ID register to query the availability
> of those registers.
> 
> Add a UCLASS_RNG driver that returns entropy via repeated reads from
> those system registers, if the extension is implemented.
> The driver always binds, but checks the availability in the probe()
> routine.
> 
> This helps systems which suffer from low boot entropy, since U-Boot can
> provide entropy via the generic UEFI entropy gathering protocol to the OS,
> at an early stage.
> 
> Signed-off-by: Andre Przywara <andre.przywara at arm.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/master, thanks!

-- 
Tom
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