Step 1, Connect GPIOx pin of each device to SOC's GPIO pin on PCB.
Step 2, Configure each device GPIOx as phase sync input usage by registers GPIO_CTRL (0X60) and GPIO_INPUT_SEL (0x64).
Step 3, Select different phase for each device and enable phase synchronization by register PHASE_CTRL (0x6A).
Step 4, Configure each device into PLAY mode by register DEVICE_CTRL2 (0x03) and monitor the POWER_STATE register (0x68) until device changed to HIZ state.
Step 5, Give a 0 to 1 toggle on SOC GPIO. Then all 4 devices will enter into PLAY mode and device to Device PWM phase shift should be fixed with 45 degree.
Step 6, Phase Synchronization has been finished. Configure the GPIOx pin to other function based on the application.