hwrng: exynos - Add support for Exynos random number generator

This patch supports Exynos SOC's PRNG driver. Exynos's PRNG has 5 seeds and
5 random number outputs. Module is excuted under runtime power management control,
so it activates only while it's in use. Otherwise it will be suspended generally.
It was tested on PQ board by rngtest program.

Signed-off-by: Jonghwa Lee <jonghwa3.lee@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/char/hw_random/Kconfig b/drivers/char/hw_random/Kconfig
index f45dad39a18b..b01d67328243 100644
--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -263,3 +263,15 @@ config HW_RANDOM_PSERIES
           module will be called pseries-rng.
 
           If unsure, say Y.
+
+config HW_RANDOM_EXYNOS
+        tristate "EXYNOS HW random number generator support"
+        depends on HW_RANDOM && HAS_IOMEM && HAVE_CLK
+        ---help---
+          This driver provides kernel-side support for the Random Number
+          Generator hardware found on EXYNOS SOCs.
+
+          To compile this driver as a module, choose M here: the
+          module will be called exynos-rng.
+
+          If unsure, say Y.