| .. SPDX-License-Identifier: GPL-2.0+ |
| .. sectionauthor:: Patrice Chotard <patrice.chotard@foss.st.com> |
| |
| Binding/unbinding a driver |
| ========================== |
| |
| This document aims to describe the bind and unbind commands. |
| |
| For debugging 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: |
| |
| bind <node path> <driver> |
| bind <class> <index> <driver> |
| |
| unbind <node path> |
| unbind <class> <index> |
| unbind <class> <index> <driver> |
| |
| Where: |
| - <node path> is the node's device tree path |
| - <class> is one of the class available in the list given by the "dm uclass" |
| command or first column of "dm tree" command. |
| - <index> is the index of the parent's node (second column of "dm tree" output). |
| - <driver> is the driver name to bind given by the "dm drivers" command or the by |
| the fourth column of "dm tree" output. |
| |
| example: |
| |
| bind usb_dev_generic 0 usb_ether |
| unbind usb_dev_generic 0 usb_ether |
| or |
| unbind eth 1 |
| |
| bind /ocp/omap_dwc3@48380000/usb@48390000 usb_ether |
| unbind /ocp/omap_dwc3@48380000/usb@48390000 |
