[PATCH v3 3/5] doc: document read/write commands

[Rasmus Villemoes]

The read and write commands are, deliberately, implemented in the same
file, so that they stay feature-compatible (e.g. if someone implements
support for "read the full partition, however large that is", that
same syntax should also work for write). In order to ensure the
documentation for both are similarly kept in sync, and to avoid
duplication, document them both in read.rst, and add a stub write.rst
referring to read.rst.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes at prevas.dk>
---
 doc/usage/cmd/read.rst  | 44 +++++++++++++++++++++++++++++++++++++++++
 doc/usage/cmd/write.rst |  6 ++++++
 doc/usage/index.rst     |  2 ++
 3 files changed, 52 insertions(+)
 create mode 100644 doc/usage/cmd/read.rst
 create mode 100644 doc/usage/cmd/write.rst

diff --git a/doc/usage/cmd/read.rst b/doc/usage/cmd/read.rst
new file mode 100644
index 0000000000..840846728f
--- /dev/null
+++ b/doc/usage/cmd/read.rst
@@ -0,0 +1,44 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later:
+
+read and write commands
+=======================
+
+Synopsis
+--------
+
+::
+
+    read <interface> <dev[:part|#partname]> <addr> <blk#> <cnt>
+    write <interface> <dev[:part|#partname]> <addr> <blk#> <cnt>
+
+The read and write commands can be used for raw access to data in
+block devices (or partitions therein), i.e. without going through a
+file system.
+
+read
+----
+
+The block device is specified using the <interface> (e.g. "mmc") and
+<dev> parameters. If the block device has a partition table, one can
+optionally specify a partition number (using the :part syntax) or
+partition name (using the #partname syntax). The command then reads
+the <cnt> blocks of data starting at block number <blk#> of the given
+device/partition to the memory address <addr>.
+
+write
+-----
+
+The write command is completely equivalent to the read command, except
+of course that the transfer direction is reversed.
+
+Examples
+--------
+
+    # Read 2 MiB from partition 3 of mmc device 2 to $loadaddr
+    read mmc 2.3 $loadaddr 0 0x1000
+
+    # Read 16 MiB from the partition named 'kernel' of mmc device 1 to $loadaddr
+    read mmc 1#kernel $loadaddr 0 0x8000
+
+    # Write to the third sector of the partition named 'bootdata' of mmc device 0
+    write mmc 0#bootdata $loadaddr 2 1
diff --git a/doc/usage/cmd/write.rst b/doc/usage/cmd/write.rst
new file mode 100644
index 0000000000..06ad77e359
--- /dev/null
+++ b/doc/usage/cmd/write.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0-or-later:
+
+write command
+=============
+
+See :doc:`cmd/read`.
diff --git a/doc/usage/index.rst b/doc/usage/index.rst
index 840c20c934..7d55beace4 100644
--- a/doc/usage/index.rst
+++ b/doc/usage/index.rst
@@ -71,6 +71,7 @@ Shell commands
    cmd/printenv
    cmd/pstore
    cmd/qfw
+   cmd/read
    cmd/reset
    cmd/rng
    cmd/sbi
@@ -91,6 +92,7 @@ Shell commands
    cmd/ut
    cmd/wdt
    cmd/wget
+   cmd/write
    cmd/xxd
 
 Booting OS
-- 
2.37.2