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dt-bindings: W1: w1-gpio: added bindings for w1-gpio 

Added bindings specification for bitbanged gpio driver for Dallas
one wire protocol

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
This commit is contained in:
Eugen Hristev 2018-09-18 10:35:26 +03:00 committed by Tom Rini
parent 73aea285e3
commit e1721ba0e6
1 changed files with 40 additions and 0 deletions
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doc/device-tree-bindings/w1/w1-gpio.txt Normal file
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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";
}
};