DRV8424 stepper motor driver from Texas Instruments

Motor driver is a platform device. Motorola specific HW layout
allows for the following controllable GPIOs:

 - MOTOR_POWER_EN
 - MOTOR_FAULT_INT
 - MOTOR_STEP
 - MOTOR_DIR
 - MOTOR_EN
 - MOTOR_SLEEP
 - MOTOR_ACTIVE

There is no kernel configuration option associated with DRV8424 DLKM

Required properties:
 - compatible: only one supported "moto,drv8424"
 - drv8424-gpio-cells: number of elements allocated for gpio array in the driver
 - MOTOR_POWER_EN-gpio: gpio enabling power to the motor
 - MOTOR_FAULT_INT-gpio: gpio used as IRQ to indicate motor fault
 - MOTOR_STEP-gpio: gpio used as input for pulse generator
 - MOTOR_DIR-gpio: gpio to control motor direction
 - MOTOR_EN-gpio: gpio to control drv8424 EN state
 - MOTOR_SLEEP-gpio: gpio to control drv8424 SLEEP state
 - MOTOR_ACTIVE-gpio: gpio to control hall effect sensor measurements
 - pinctrl-names: pinctrl state "drv8424_int_default" required for motor fault IRQ

Optional properties:
 - pinctrl-names: list of pre-defined name (currently only "init_state" supported)
 - power-default-off: keep power off when not in use
 - support-mode: driver supports MODE0 and MODE1 setup
 - support-torque: driver supports T0 and T1 setup
 - no-sensors: ignore sensors data (mostly debug option)

Note:
Only following pinctrl state names are valid!!!
    "m0_low", "m0_high", "m0_disable",
    "m1_low", "m1_high", "m1_disable",
    "t0_low", "t0_high", "t0_disable",
    "t1_low", "t1_high", "t1_disable",
    "drv8424_int_default",
    "drv8424_clk_active",
    "drv8424_clk_sleep",
    "init_state"

Example:

	moto_drv8424_support {
		compatible = "moto,drv8424";
		drv8424-gpios-cells = <11>;
		pinctrl-names = "drv8424_int_default", "init_state";
		pinctrl-0 = <&drv8424_int_default>;
		pinctrl-1 = <&drv8424_pwr_en_init &drv8424_step_init &drv8424_dir_init
				&drv8424_sleep_init &drv8424_en_init &drv8424_step_init &drv8424_active_init>;
		MOTOR_POWER_EN-gpio = <&tlmm 102>;
		MOTOR_FAULT_INT-gpio = <&tlmm 112>;
		MOTOR_STEP-gpio = <&tlmm 182>;
		MOTOR_DIR-gpio = <&tlmm 183>;
		MOTOR_SLEEP-gpio = <&tlmm 184>;
		MOTOR_ACTIVE-gpio = <&tlmm 185>;
		vdd-supply = <&S10B>;
		power-default-off;
	};