From e5b5361651940ff5c0c1784dfd0130abec7ab535 Mon Sep 17 00:00:00 2001
From: wevsty <ty@wevs.org>
Date: Mon, 24 Aug 2020 02:27:11 +0800
Subject: [PATCH] char: add support for rockchip hardware random number
 generator

This patch provides hardware random number generator support for all rockchip SOC.

rockchip-rng.c from  https://github.com/rockchip-linux/kernel/blob/develop-4.4/drivers/char/hw_random/rockchip-rng.c

Signed-off-by: wevsty <ty@wevs.org>
---

--- a/drivers/char/hw_random/Kconfig
+++ b/drivers/char/hw_random/Kconfig
@@ -372,6 +372,19 @@ config HW_RANDOM_STM32
 
 	  If unsure, say N.
 
+config HW_RANDOM_ROCKCHIP
+	tristate "Rockchip Random Number Generator support"
+	depends on ARCH_ROCKCHIP
+	default HW_RANDOM
+	help
+	  This driver provides kernel-side support for the Random Number
+	  Generator hardware found on Rockchip cpus.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called rockchip-rng.
+
+	  If unsure, say Y.
+
 config HW_RANDOM_PIC32
 	tristate "Microchip PIC32 Random Number Generator support"
 	depends on HW_RANDOM && MACH_PIC32
--- a/drivers/char/hw_random/Makefile
+++ b/drivers/char/hw_random/Makefile
@@ -34,6 +34,7 @@ obj-$(CONFIG_HW_RANDOM_IPROC_RNG200) +=
 obj-$(CONFIG_HW_RANDOM_ST) += st-rng.o
 obj-$(CONFIG_HW_RANDOM_XGENE) += xgene-rng.o
 obj-$(CONFIG_HW_RANDOM_STM32) += stm32-rng.o
+obj-$(CONFIG_HW_RANDOM_ROCKCHIP) += rockchip-rng.o
 obj-$(CONFIG_HW_RANDOM_PIC32) += pic32-rng.o
 obj-$(CONFIG_HW_RANDOM_MESON) += meson-rng.o
 obj-$(CONFIG_HW_RANDOM_CAVIUM) += cavium-rng.o cavium-rng-vf.o