On Wed, Apr 30, 2025 at 06:16:33PM +0200, Nicolas Frattaroli wrote: > Gee Nicolas, how come your mom lets you write two Rockchip HWRNG drivers > in a year? > > In short, RK3576 (and RK3562 and RK3528) introduce another HWRNG IP. It > actually has quite a few cool features, but I ignored the cool bits and > went straight for the true entropy. Some of the cool bits someone else > may wish to add in the future: AES-CTR PRNG that's regularly reseeded > from the entropy, adjustments for oscillator and oscillator ring lengths > to maximise entropy generation, automatic continuous quality checking of > the produced entropy by the hardware itself, etc. > > In testing, it seems to produce about 2 mbit/s of high quality entropy > on the RK3576 with its default settings when we read the TRNG entropy > output directly. That's less than we'd get if we had the hardware use > the PRNG to stretch it, but I've decided to leave that up to Linux's > entropy pool implementation for now. > > RK3562 and RK3528 probably just need a compatible and a DTS node to > enable it as well, but I don't have any RK3562/RK3528 boards to test > this with, so it's not done in this series. > > Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@xxxxxxxxxxxxx> > --- > Nicolas Frattaroli (3): > dt-bindings: rng: rockchip,rk3588-rng: add rk3576-rng compatible > hwrng: rockchip - add support for RK3576's RNG > arm64: dts: rockchip: add RK3576 RNG node > > .../bindings/rng/rockchip,rk3588-rng.yaml | 5 +- > arch/arm64/boot/dts/rockchip/rk3576.dtsi | 8 +++ > drivers/char/hw_random/rockchip-rng.c | 73 ++++++++++++++++++++++ > 3 files changed, 84 insertions(+), 2 deletions(-) > --- > base-commit: 4e0a9c660788594b5b49ac07f0fbdccd2218431e > change-id: 20250429-rk3576-hwrng-8c308b5711ae > > Best regards, > -- > Nicolas Frattaroli <nicolas.frattaroli@xxxxxxxxxxxxx> Patches 1-2 applied. Thanks. -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
