[PATCH v5 4/6] sysinfo: Add documentation

[Detlev Casanova <detlev.casanova@collabora.com>]

Add documentation for the sysinfo command with examples.

Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>
Signed-off-by: Detlev Casanova <detlev.casanova@collabora.com>
---
 doc/usage/cmd/sysinfo.rst | 56 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 doc/usage/cmd/sysinfo.rst

diff --git a/doc/usage/cmd/sysinfo.rst b/doc/usage/cmd/sysinfo.rst
new file mode 100644
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+.. SPDX-License-Identifier: GPL-2.0+:
+
+sysinfo command
+===============
+
+Synopis
+-------
+
+::
+
+    sysinfo id <varname>
+    sysinfo model <varname>
+    sysinfo revision <varname>
+
+Description
+-----------
+
+The `sysinfo` command is used to show information about the running system
+
+The `sysinfo id` command prints or sets an environment variable to the board id
+as an hex value.
+
+    varname
+        an optional environment variable to store the board id into.
+
+The `sysinfo model` command prints or sets an environment variable to the board
+model name as a string value.
+
+    varname
+        an optional environment variable to store the board model name into.
+
+The `sysinfo revision` command prints or sets an environment variable to the
+board revision in the <MAJOR>.<MINOR> format, where MINOR and MINOR are int
+values.
+
+    varname
+        an optional environment variable to store the board revision into.
+
+Examples
+--------
+
+::
+
+    => sysinfo id
+    0x0b
+    => sysinfo model
+    Renesas Starter Kit Premier board rev 2.1
+    => sysinfo revision varname
+    => env print varname
+    2.1
+
+Return value
+------------
+
+The return value $? is set to 0 (true) if the command succeeded. If an
+error occurs, the return value $? is set to 1 (false).
-- 
2.41.0