Documentation/devicetree/bindings/pinctrl/ti,da850-pupd.txt

   1 * Pin configuration for TI DA850/OMAP-L138/AM18x
   2
   3 These SoCs have a separate controller for setting bias (internal pullup/down).
   4 Bias can only be selected for groups rather than individual pins.
   5
   6 Required 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
  12 The controller node also acts as a container for pin group configuration nodes.
  13 The names of these groups are ignored.
  14
  15 Pin 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
  20 The pin configuration parameters use the generic pinconf bindings defined in
  21 pinctrl-bindings.txt in this directory. The supported parameters are
  22 bias-disable, bias-pull-up, bias-pull-down.
  23
  24
  25 Example
  26 -------
  27
  28 In common dtsi file:
  29
  30         pinconf: pin-controller@22c00c {
  31                 compatible = "ti,da850-pupd";
  32                 reg = <0x22c00c 0x8>;
  33         };
  34
  35 In 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         };