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11da3403e9
For nearly all commands in U-Boot the '?' variable is handled the same way with 0 meaning success, 1 meaning any failure. Explain this in the general rules section of the cmdline documentation (with a link to a counter example) and then remove the redundant wording from most commands. We retain a section about the return value in a number of places where we are doing something such as always returning a specific value or we have useful additional information to go along with the normal return codes. Signed-off-by: Tom Rini <trini@konsulko.com> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
94 lines
2.5 KiB
ReStructuredText
94 lines
2.5 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+:
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.. index::
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single: unbind (command)
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unbind command
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==============
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Synopsis
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--------
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::
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unbind <node path>
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unbind <class> <seq>
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unbind <class> <seq> <driver>
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Description
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-----------
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The unbind command is used to unbind a device from a driver. This makes the
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device unavailable in U-Boot.
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node path
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path of the device's device-tree node
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class
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device class name
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seq
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sequence number of the device in the device class
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driver
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device driver name
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Example
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-------
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Given a system with a real time clock device with device path */pl031@9010000*
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and using driver rtc-pl031 unbinding and binding of the device is demonstrated
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using the three alternative unbind syntaxes.
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.. code-block::
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=> dm tree
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Class Seq Probed Driver Name
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-----------------------------------------------------------
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root 0 [ + ] root_driver root_driver
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...
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rtc 0 [ ] rtc-pl031 |-- pl031@9010000
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...
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=> fdt addr $fdtcontroladdr
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Working FDT set to 7ed7fdb0
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=> fdt print
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/ {
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interrupt-parent = <0x00008003>;
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model = "linux,dummy-virt";
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#size-cells = <0x00000002>;
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#address-cells = <0x00000002>;
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compatible = "linux,dummy-virt";
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...
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pl031@9010000 {
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clock-names = "apb_pclk";
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clocks = <0x00008000>;
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interrupts = <0x00000000 0x00000002 0x00000004>;
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reg = <0x00000000 0x09010000 0x00000000 0x00001000>;
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compatible = "arm,pl031", "arm,primecell";
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};
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...
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}
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=> unbind /pl031@9010000
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=> dm tree
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Class Seq Probed Driver Name
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-----------------------------------------------------------
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root 0 [ + ] root_driver root_driver
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...
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=> unbind /pl031@9010000
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Cannot find a device with path /pl031@9010000
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=> bind /pl031@9010000 rtc-pl031
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=> dm tree
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Class Seq Probed Driver Name
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-----------------------------------------------------------
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root 0 [ + ] root_driver root_driver
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...
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rtc 0 [ ] rtc-pl031 |-- pl031@9010000
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=> unbind rtc 0
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=> bind /pl031@9010000 rtc-pl031
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=> unbind rtc 0 rtc-pl031
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Configuration
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-------------
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The unbind command is only available if CONFIG_CMD_BIND=y.
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