cmd: rng: Add rng list command
The 'rng list' command probes all RNG devices and list those devices
that are successfully probed. Also update the help info.
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Weizhao Ouyang <o451686892@gmail.com>
diff --git a/cmd/rng.c b/cmd/rng.c
index 52f722c..b073a6c 100644
--- a/cmd/rng.c
+++ b/cmd/rng.c
@@ -19,6 +19,22 @@
struct udevice *dev;
int ret = CMD_RET_SUCCESS;
+ if (argc == 2 && !strcmp(argv[1], "list")) {
+ int idx = 0;
+
+ uclass_foreach_dev_probe(UCLASS_RNG, dev) {
+ idx++;
+ printf("RNG #%d - %s\n", dev->seq_, dev->name);
+ }
+
+ if (!idx) {
+ log_err("No RNG device\n");
+ return CMD_RET_FAILURE;
+ }
+
+ return CMD_RET_SUCCESS;
+ }
+
switch (argc) {
case 1:
devnum = 0;
@@ -56,12 +72,9 @@
return ret;
}
-U_BOOT_LONGHELP(rng,
- "[dev [n]]\n"
- " - print n random bytes(max 64) read from dev\n");
-
U_BOOT_CMD(
rng, 3, 0, do_rng,
"print bytes from the hardware random number generator",
- rng_help_text
+ "list - list all the probed rng devices\n"
+ "rng [dev] [n] - print n random bytes(max 64) read from dev\n"
);
diff --git a/doc/usage/cmd/rng.rst b/doc/usage/cmd/rng.rst
index 274e4d8..4a61e33 100644
--- a/doc/usage/cmd/rng.rst
+++ b/doc/usage/cmd/rng.rst
@@ -11,16 +11,22 @@
::
- rng [devnum [n]]
+ rng list
+ rng [dev] [n]
-Description
------------
+rng list
+--------
+
+List all the probed rng devices.
+
+rng [dev] [n]
+-------------
The *rng* command reads the random number generator(RNG) device and
prints the random bytes read on the console. A maximum of 64 bytes can
be read in one invocation of the command.
-devnum
+dev
The RNG device from which the random bytes are to be
read. Defaults to 0.