Device-tree bindings for TI DA8XX/OMAP-L138/AM18XX pullup/pulldown
pinconf controller.
Signed-off-by: David Lechner <da...@lechnology.com>
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+* 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;
+ };
+ };
+ };
--
2.7.4
