[PATCH v2 5/5] doc: add bind/unbind command documentation

[Patrice Chotard]

Add documentation in doc/drivel-model for the bind/unbind command.
Part of this documentation is extracted from original patch commit
message:
commit 49c752c93a78 ("cmd: Add bind/unbind commands to bind a device to a driver from the command line")

Signed-off-by: Patrice Chotard <patrice.chotard at st.com>
---

Changes in v2: None

 doc/driver-model/bind.rst  | 32 ++++++++++++++++++++++++++++++++
 doc/driver-model/index.rst |  1 +
 2 files changed, 33 insertions(+)
 create mode 100644 doc/driver-model/bind.rst

diff --git a/doc/driver-model/bind.rst b/doc/driver-model/bind.rst
new file mode 100644
index 0000000000..df6b5f143b
--- /dev/null
+++ b/doc/driver-model/bind.rst
@@ -0,0 +1,32 @@
+.. SPDX-License-Identifier: GPL-2.0+
+.. sectionauthor:: Patrice Chotard <patrice.chotard at st.com>
+
+Binding/unbiding a driver
+=========================
+
+This documents aims to describe the bind and unbind commands.
+
+For debug purpose, it should be useful to bind or unbind a driver from
+the U-boot command line.
+
+The unbind command calls the remove device driver callback and unbind the
+device from its driver.
+
+The bind command binds a device to its driver.
+
+In some cases it can be useful to be able to bind a device to a driver from
+the command line.
+The obvious example is for versatile devices such as USB gadget.
+Another use case is when the devices are not yet ready at startup and
+require some setup before the drivers are bound (ex: FPGA which bitsream is
+fetched from a mass storage or ethernet)
+
+usage example:
+
+bind usb_dev_generic 0 usb_ether
+unbind usb_dev_generic 0 usb_ether
+or
+unbind eth 1
+
+bind /ocp/omap_dwc3 at 48380000/usb at 48390000 usb_ether
+unbind /ocp/omap_dwc3 at 48380000/usb at 48390000
diff --git a/doc/driver-model/index.rst b/doc/driver-model/index.rst
index b9df221627..37ef3721df 100644
--- a/doc/driver-model/index.rst
+++ b/doc/driver-model/index.rst
@@ -6,6 +6,7 @@ Driver Model
 .. toctree::
    :maxdepth: 2
 
+   bind
    debugging
    design
    ethernet
-- 
2.17.1