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/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.