hwrng: ppc4xx - add support for ppc4xx TRNG
Various PowerPC 4xx SoCs contain a TRNG embedded in the Security function. This adds a device driver for that TRNG. Signed-off-by: Josh Boyer <jwboyer@linux.vnet.ibm.com> Acked-by: Matt Mackall <mpm@selenic.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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