[PATCH V4 5/7] rockchip: board: Add board_rng_seed() for all Rockchip devices

[Chris Morgan <macroalpha82@gmail.com>]

From: Chris Morgan <macromorgan@hotmail.com>

Allow all rockchip devices to use the hardware RNG to seed Linux
RNG.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 arch/arm/mach-rockchip/board.c             | 32 ++++++++++++++++++++++
 board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c | 29 --------------------
 2 files changed, 32 insertions(+), 29 deletions(-)

diff --git a/arch/arm/mach-rockchip/board.c b/arch/arm/mach-rockchip/board.c
index 57f08e0be0..77145524ea 100644
--- a/arch/arm/mach-rockchip/board.c
+++ b/arch/arm/mach-rockchip/board.c
@@ -348,3 +348,35 @@ __weak int misc_init_r(void)
 	return ret;
 }
 #endif
+
+#if IS_ENABLED(CONFIG_BOARD_RNG_SEED) && IS_ENABLED(CONFIG_RNG_ROCKCHIP)
+#include <rng.h>
+
+/* Use hardware rng to seed Linux random. */
+__weak int board_rng_seed(struct abuf *buf)
+{
+	struct udevice *dev;
+	size_t len = 0x8;
+	u64 *data;
+
+	data = malloc(len);
+	if (!data) {
+		printf("Out of memory\n");
+		return -ENOMEM;
+	}
+
+	if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
+		printf("No RNG device\n");
+		return -ENODEV;
+	}
+
+	if (dm_rng_read(dev, data, len)) {
+		printf("Reading RNG failed\n");
+		return -EIO;
+	}
+
+	abuf_init_set(buf, data, len);
+
+	return 0;
+}
+#endif
diff --git a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c
index 45854709f5..7bef5a53f0 100644
--- a/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c
+++ b/board/anbernic/rgxx3_rk3566/rgxx3-rk3566.c
@@ -17,7 +17,6 @@
 #include <mmc.h>
 #include <panel.h>
 #include <pwm.h>
-#include <rng.h>
 #include <stdlib.h>
 #include <video_bridge.h>
 
@@ -137,34 +136,6 @@ void spl_board_init(void)
 	       (GPIO0_BASE + GPIO_SWPORT_DR_H));
 }
 
-/* Use hardware rng to seed Linux random. */
-int board_rng_seed(struct abuf *buf)
-{
-	struct udevice *dev;
-	size_t len = 0x8;
-	u64 *data;
-
-	data = malloc(len);
-	if (!data) {
-		printf("Out of memory\n");
-		return -ENOMEM;
-	}
-
-	if (uclass_get_device(UCLASS_RNG, 0, &dev) || !dev) {
-		printf("No RNG device\n");
-		return -ENODEV;
-	}
-
-	if (dm_rng_read(dev, data, len)) {
-		printf("Reading RNG failed\n");
-		return -EIO;
-	}
-
-	abuf_init_set(buf, data, len);
-
-	return 0;
-}
-
 /*
  * Buzz the buzzer so the user knows something is going on. Make it
  * optional in case PWM is disabled.
-- 
2.34.1