f8fc109960
repo: https://github.com/u-boot/u-boot commit: d80bb749fab53da72c4a0e09b8c2d2aaa3103c91 Change-Id: Ie6434426e1ec15bc08bb1832798e371f3fd5fb29
50 lines
1.5 KiB
ReStructuredText
50 lines
1.5 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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.. sectionauthor:: Patrice Chotard <patrice.chotard@foss.st.com>
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Binding/unbinding a driver
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==========================
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This document aims to describe the bind and unbind commands.
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For debugging purpose, it should be useful to bind or unbind a driver from
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the U-boot command line.
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The unbind command calls the remove device driver callback and unbind the
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device from its driver.
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The bind command binds a device to its driver.
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In some cases it can be useful to be able to bind a device to a driver from
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the command line.
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The obvious example is for versatile devices such as USB gadget.
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Another use case is when the devices are not yet ready at startup and
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require some setup before the drivers are bound (ex: FPGA which bitsream is
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fetched from a mass storage or ethernet)
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usage:
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bind <node path> <driver>
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bind <class> <index> <driver>
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unbind <node path>
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unbind <class> <index>
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unbind <class> <index> <driver>
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Where:
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- <node path> is the node's device tree path
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- <class> is one of the class available in the list given by the "dm uclass"
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command or first column of "dm tree" command.
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- <index> is the index of the parent's node (second column of "dm tree" output).
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- <driver> is the driver name to bind given by the "dm drivers" command or the by
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the fourth column of "dm tree" output.
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example:
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bind usb_dev_generic 0 usb_ether
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unbind usb_dev_generic 0 usb_ether
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or
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unbind eth 1
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bind /ocp/omap_dwc3@48380000/usb@48390000 usb_ether
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unbind /ocp/omap_dwc3@48380000/usb@48390000
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