[PATCH 3/3] cmd: rng: Add rng list command

[Weizhao Ouyang]

Add rng list command to list all probed RNG device.

Signed-off-by: Weizhao Ouyang <o451686892 at gmail.com>
---
 cmd/rng.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/cmd/rng.c b/cmd/rng.c
index 52f722c7af..4818133f94 100644
--- a/cmd/rng.c
+++ b/cmd/rng.c
@@ -18,6 +18,19 @@ static int do_rng(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 	int devnum;
 	struct udevice *dev;
 	int ret = CMD_RET_SUCCESS;
+	int idx;
+
+	if (argc == 2 && !strcmp(argv[1], "list")) {
+		uclass_foreach_dev_probe(UCLASS_RNG, dev) {
+			printf("RNG #%d - %s\n", dev->seq_, dev->name);
+		}
+
+		if (!idx) {
+			printf("*** no RNG devices available ***\n");
+			return CMD_RET_FAILURE;
+		}
+		return CMD_RET_SUCCESS;
+	}
 
 	switch (argc) {
 	case 1:
@@ -57,6 +70,8 @@ static int do_rng(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 }
 
 U_BOOT_LONGHELP(rng,
+	"[list]\n"
+	"  - list all the probe rng device\n"
 	"[dev [n]]\n"
 	"  - print n random bytes(max 64) read from dev\n");
 
-- 
2.39.2