xref: /linux/Documentation/devicetree/bindings/pinctrl/ti,da850-pupd.txt (revision 791d3ef2e11100449837dc0b6fe884e60ca3a484) 
1* Pin configuration for TI DA850/OMAP-L138/AM18x
2
3These SoCs have a separate controller for setting bias (internal pullup/down).
4Bias can only be selected for groups rather than individual pins.
5
6Required Properties:
7
8  - compatible: Must be "ti,da850-pupd"
9  - reg: Base address and length of the memory resource used by the pullup/down
10    controller hardware module.
11
12The controller node also acts as a container for pin group configuration nodes.
13The names of these groups are ignored.
14
15Pin Group Node Properties:
16
17- groups: An array of strings, each string containing the name of a pin group.
18          Valid names are "cp0".."cp31".
19
20The pin configuration parameters use the generic pinconf bindings defined in
21pinctrl-bindings.txt in this directory. The supported parameters are
22bias-disable, bias-pull-up, bias-pull-down.
23
24
25Example
26-------
27
28In common dtsi file:
29
30	pinconf: pin-controller@22c00c {
31		compatible = "ti,da850-pupd";
32		reg = <0x22c00c 0x8>;
33	};
34
35In board-specific file:
36
37	&pinconf {
38		pinctrl-0 = <&pinconf_bias_groups>;
39		pinctrl-names = "default";
40
41		pinconf_bias_groups: bias-groups {
42			pull-up {
43				groups = "cp30", "cp31";
44				bias-pull-up;
45			};
46			pull-down {
47				groups = "cp29", "cp28";
48				bias-pull-down;
49			};
50			disable {
51				groups = "cp27", "cp26";
52				bias-disable;
53			};
54		};
55	};
56