mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-06 05:04:26 +00:00
39 lines
821 B
Text
39 lines
821 B
Text
W1 gpio device binding - one wire protocol over bitbanged gpio
|
|
=======================
|
|
|
|
|
|
Child nodes are required in device tree. The driver will detect
|
|
the devices serial number and then search in the child nodes in the device tree
|
|
for the proper node and try to match it with the device.
|
|
|
|
Also check doc/device-tree-bindings/w1-eeprom for possible child nodes drivers
|
|
|
|
Driver:
|
|
- drivers/w1/w1-gpio.c
|
|
|
|
Software w1 device-tree node properties:
|
|
Required:
|
|
* compatible = "w1-gpio";
|
|
* gpios = <...>;
|
|
This is the gpio used for one wire protocol, using bitbanging
|
|
|
|
Optional:
|
|
* none
|
|
|
|
Example:
|
|
|
|
onewire_tm: onewire {
|
|
compatible = "w1-gpio";
|
|
gpios = <&pioA 32 0>;
|
|
};
|
|
|
|
Example with child:
|
|
|
|
onewire_tm: onewire {
|
|
compatible = "w1-gpio";
|
|
gpios = <&pioA 32 0>;
|
|
|
|
eeprom1: eeprom@0 {
|
|
compatible = "maxim,ds24xxx";
|
|
}
|
|
};
|