[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 <o451686...@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