xref: /freebsd/sys/contrib/device-tree/Bindings/w1/w1-gpio.txt (revision c66ec88fed842fbaad62c30d510644ceb7bd2d71) 
1*c66ec88fSEmmanuel Vadotw1-gpio devicetree bindings
2*c66ec88fSEmmanuel Vadot
3*c66ec88fSEmmanuel VadotRequired properties:
4*c66ec88fSEmmanuel Vadot
5*c66ec88fSEmmanuel Vadot - compatible: "w1-gpio"
6*c66ec88fSEmmanuel Vadot - gpios: one or two GPIO specs:
7*c66ec88fSEmmanuel Vadot		- the first one is used as data I/O pin
8*c66ec88fSEmmanuel Vadot		- the second one is optional. If specified, it is used as
9*c66ec88fSEmmanuel Vadot		  enable pin for an external pin pullup.
10*c66ec88fSEmmanuel Vadot
11*c66ec88fSEmmanuel VadotOptional properties:
12*c66ec88fSEmmanuel Vadot
13*c66ec88fSEmmanuel Vadot - linux,open-drain: if specified, the data pin is considered in
14*c66ec88fSEmmanuel Vadot		     open-drain mode.
15*c66ec88fSEmmanuel Vadot
16*c66ec88fSEmmanuel VadotAlso refer to the generic w1.txt document.
17*c66ec88fSEmmanuel Vadot
18*c66ec88fSEmmanuel VadotExamples:
19*c66ec88fSEmmanuel Vadot
20*c66ec88fSEmmanuel Vadot	onewire {
21*c66ec88fSEmmanuel Vadot		compatible = "w1-gpio";
22*c66ec88fSEmmanuel Vadot		gpios = <&gpio 0 GPIO_ACTIVE_HIGH>;
23*c66ec88fSEmmanuel Vadot
24*c66ec88fSEmmanuel Vadot		battery {
25*c66ec88fSEmmanuel Vadot			// ...
26*c66ec88fSEmmanuel Vadot		};
27*c66ec88fSEmmanuel Vadot	};
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