Step 1, Connect GPIOx pin of each device to the SOC 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 nter 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.