STMicroelectronics STM32 Low-Power Timer quadrature encoder and counter STM32 Low-Power Timer provides several counter modes. It can be used as: - quadrature encoder to detect angular position and direction of rotary elements, from IN1 and IN2 input signals. - simple counter from IN1 input signal. Must be a sub-node of an STM32 Low-Power Timer device tree node. See ../mfd/stm32-lptimer.txt for details about the parent node. Required properties: - compatible: Must be "st,stm32-lptimer-counter". - pinctrl-names: Set to "default". - pinctrl-0: List of phandles pointing to pin configuration nodes, to set IN1/IN2 pins in mode of operation for Low-Power Timer input on external pin. Example: timer@40002400 { compatible = "st,stm32-lptimer"; ... counter { compatible = "st,stm32-lptimer-counter"; pinctrl-names = "default"; pinctrl-0 = <&lptim1_in_pins>; }; };