doc: man-page for the sound command
Provide a man-page for the sound command.
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/doc/usage/cmd/sound.rst b/doc/usage/cmd/sound.rst
new file mode 100644
index 0000000..d3fac24
--- /dev/null
+++ b/doc/usage/cmd/sound.rst
@@ -0,0 +1,41 @@
+.. SPDX-License-Identifier: GPL-2.0+
+.. Copyright 2022, Heinrich Schuchardt <xypron.glpk@gmx.de>
+
+sound command
+=============
+
+Synopsis
+--------
+
+::
+
+ sound init
+ sound play [len [freq]]
+
+Description
+-----------
+
+The *sound* command is used to play a beep sound.
+
+sound init
+ initializes the sound driver.
+
+sound play
+ plays a square wave sound. It does not depend on previously calling
+ *sound init*.
+
+len
+ duration of the sound in ms, defaults to 1000 ms
+
+freq
+ frequency of the sound in Hz, defaults to 400 Hz
+
+Configuration
+-------------
+
+The sound command is enabled by CONFIG_CMD_SOUND=y.
+
+Return value
+------------
+
+The return value $? is 0 (true) if the command succeeds, 1 (false) otherwise.
diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index 0bc8288..bbd40a6 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -73,6 +73,7 @@
cmd/scp03
cmd/setexpr
cmd/size
+ cmd/sound
cmd/temperature
cmd/tftpput
cmd/true