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85b61e1e43
DTS modules (device modules) often have a single source file with an empty `struct Module`. The module's yaml file now allows a `dts-only` boolean to be set, so the source file becomes optional. `devicetree.yaml` is renamed everywhere to `module.yaml`
GPIO Trackball
Kernel driver for a 5-way GPIO trackball (4 direction pins + a click button), exposing a
TRACKBALL_TYPE device (tactility/drivers/trackball.h).
Devicetree binding: tactility,gpio-trackball (see bindings/tactility,gpio-trackball.yaml).
Each direction pin is wired to a falling-edge interrupt that accumulates a signed delta;
the click pin is active-low and read on any edge. read_delta() drains and resets the
accumulated delta on each call.
Example
trackball {
compatible = "tactility,gpio-trackball";
pin-right = <&gpio0 1 GPIO_FLAG_NONE>;
pin-up = <&gpio0 2 GPIO_FLAG_NONE>;
pin-left = <&gpio0 3 GPIO_FLAG_NONE>;
pin-down = <&gpio0 4 GPIO_FLAG_NONE>;
pin-click = <&gpio0 5 GPIO_FLAG_NONE>;
};