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b7a2f80740
Replace the downstream mtk-rng-v2 driver which was acquires random bytes from TF-A via SMC. A new approach is needed as TF-A for MT7986 has changed and now requires to use SMC instead of directly accessing the TRNG via MMIO. However, we can't know whether we are on old or new TF-A, many devices (like the BananaPi BPi-R3) allow updating TF-A BL3 in the field, so it may be of the old or new type, and the RNG driver will have to figure it out somehow. This currently means that MT7986 with newer TF-A has broken/non-working HWRNG in Linux: root@OpenWrt:~# hexdump -C /dev/hwrng hexdump: /dev/hwrng: I/O error Fix this by creating a new combined driver which replaces the previous mtk-rng-v2 driver, and is able to auto-detect which convention to use on MT7986. Signed-off-by: Daniel Golle <daniel@makrotopia.org>