doc: man-page for the part command

Provide a man-page for the part command.

Signed-off-by: Enric Balletbo i Serra <eballetbo@redhat.com>

doc/usage/cmd/part.rst

@@ -0,0 +1,136 @@
+.. SPDX-License-Identifier: GPL-2.0+:
+
+part command
+===============
+
+Synopis
+-------
+
+::
+
+    part uuid <interface> <dev>:<part> [varname]
+    part list <interface> <dev> [flags] [varname]
+    part start <interface> <dev> <part> <varname>
+    part size <interface> <dev> <part> <varname>
+    part number <interface> <dev> <part> <varname>
+    part types
+
+Description
+-----------
+
+The `part` command is used to manage disk partition related commands.
+
+The 'part uuid' command prints or sets an environment variable to partition UUID
+
+    interface
+        interface for accessing the block device (mmc, sata, scsi, usb, ....)
+    dev
+        device number
+    part
+        partition number
+    varname
+        an optional environment variable to store the current partition UUID value into.
+
+The 'part list' command prints or sets an environment variable to the list of partitions
+
+    interface
+        interface for accessing the block device (mmc, sata, scsi, usb, ....)
+    dev
+        device number
+    part
+        partition number
+    flags
+        -bootable
+            lists only bootable partitions
+    varname
+        an optional environment variable to store the list of partitions value into.
+
+The 'part start' commnad sets an environment variable to the start of the partition (in blocks),
+part can be either partition number or partition name.
+
+    interface
+        interface for accessing the block device (mmc, sata, scsi, usb, ....)
+    dev
+        device number
+    part
+        partition number
+    varname
+        a variable to store the current start of the partition value into.
+
+The 'part size' command sets an environment variable to the size of the partition (in blocks),
+part can be either partition number or partition name.
+
+    interface
+        interface for accessing the block device (mmc, sata, scsi, usb, ....)
+    dev
+        device number
+    part
+        partition number
+    varname
+        a variable to store the current size of the partition value into.
+
+The 'part number' command sets an environment variable to the partition number using the partition name,
+part must be specified as partition name.
+
+    interface
+        interface for accessing the block device (mmc, sata, scsi, usb, ....)
+    dev
+        device number
+    part
+        partition number
+    varname
+        a variable to store the current partition number value into
+
+The 'part types' command list supported partition table types.
+
+Examples
+--------
+
+::
+
+    => host bind 0 ./test_gpt_disk_image.bin
+    => part uuid host 0:1
+    24156b69-3378-497f-bb3e-b982223de528
+    => part uuid host 0:1 varname
+    => env print varname
+    varname=24156b69-3378-497f-bb3e-b982223de528
+    =>
+    => part list host 0
+
+    Partition Map for HOST device 0  --   Partition Type: EFI
+
+    Part	Start LBA	End LBA		Name
+    Attributes
+    Type GUID
+    Partition GUID
+    1	        0x00000800	0x00000fff	"second"
+    attrs:	0x0000000000000000
+    type:	ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
+                (data)
+    guid:	24156b69-3378-497f-bb3e-b982223de528
+    2	        0x00001000	0x00001bff	"first"
+    attrs:	0x0000000000000000
+    type:	ebd0a0a2-b9e5-4433-87c0-68b6b72699c7
+                (data)
+    guid:	5272ee44-29ab-4d46-af6c-4b45ac67d3b7
+    =>
+    => part start host 0 2 varname
+    => env print varname
+    varname=1000
+    =>
+    => part size host 0 2 varname
+    => env print varname
+    varname=c00
+    =>
+    => part number host 0 2 varname
+    => env print varname
+    varname=0x2
+    =>
+    => part types
+    Supported partition tables: EFI, AMIGA, DOS, ISO, MAC
+
+Return value
+------------
+
+The return value $? is set to 0 (true) if the command succededd. If an
+error occurs, the return value $? is set to 1 (false).

doc/usage/index.rst

@@ -61,6 +61,7 @@ Shell commands
    cmd/mbr
    cmd/md
    cmd/mmc
+   cmd/part
    cmd/pause
    cmd/pinmux
    cmd/printenv