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104 lines
2.8 KiB
ReStructuredText
104 lines
2.8 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+:
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bind command
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============
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Synopsis
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--------
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::
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bind <node path> <driver>
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bind <class> <index> <driver>
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Description
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-----------
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The bind command is used to bind a device to a driver. This makes the
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device available in U-Boot.
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While binding to a *node path* typically provides a working device
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binding by parent node and driver may lead to a device that is only
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partially initialized.
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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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index
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index of the parent 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 two alternative bind syntaxes.
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.. code-block::
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=> dm tree
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Class Index 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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=> date
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Cannot find RTC: err=-19
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=> dm tree
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Class Index 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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=> bind /pl031@9010000 rtc-pl031
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=> dm tree
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Class Index 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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=> date
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Date: 2023-06-22 (Thursday) Time: 15:14:51
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=> unbind rtc 0 rtc-pl031
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=> bind root 0 rtc-pl031
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=> date
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Date: 1980-08-19 (Tuesday) Time: 14:45:30
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Obviously the device is not initialized correctly by the last bind command.
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Configuration
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-------------
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The bind command is only available if CONFIG_CMD_BIND=y.
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Return code
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-----------
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The return code $? is 0 (true) on success and 1 (false) on failure.
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