Kernel-4.18.0-80.el8_ti,da850-pup

• Pin configuration for TI DA850/OMAP-L138/AM18x

These SoCs have a separate controller for setting bias (internal pullup/down).
Bias can only be selected for groups rather than individual pins.

Required Properties:

• compatible: Must be “ti,da850-pupd”
• reg: Base address and length of the memory resource used by the pullup/down
  controller hardware module.

The controller node also acts as a container for pin group configuration nodes.
The names of these groups are ignored.

Pin Group Node Properties:

• groups: An array of strings, each string containing the name of a pin group.

      Valid names are "cp0".."cp31".
  

The pin configuration parameters use the generic pinconf bindings defined in
pinctrl-bindings.txt in this directory. The supported parameters are
bias-disable, bias-pull-up, bias-pull-down.

Example

In common dtsi file:

pinconf: pin-controller@22c00c {
    compatible = "ti,da850-pupd";
    reg = <0x22c00c 0x8>;
};

In board-specific file:

&pinconf {
    pinctrl-0 = <&pinconf_bias_groups>;
    pinctrl-names = "default";

    pinconf_bias_groups: bias-groups {
        pull-up {
            groups = "cp30", "cp31";
            bias-pull-up;
        };
        pull-down {
            groups = "cp29", "cp28";
            bias-pull-down;
        };
        disable {
            groups = "cp27", "cp26";
            bias-disable;
        };
    };
};