Raspberry Pi Firwmware PoE Hat PWM support

modulename: pwm-raspberrypi-poe.ko

configname: CONFIG_PWM_RASPBERRYPI_POE

Linux Kernel Configuration
└─>Device Drivers
└─>Pulse-Width Modulation (PWM) Support
└─>Raspberry Pi Firwmware PoE Hat PWM support
In linux kernel since version 5.2 (release Date: 2019-07-07)  
Enable Raspberry Pi firmware controller PWM bus used to control the
official RPI PoE hat

source code:
drivers/pwm/pwm-raspberrypi-poe.c
depends
CONFIG_PWM
CONFIG_RASPBERRYPI_FIRMWARE or CONFIG_COMPILE_TEST
NOT CONFIG_RASPBERRYPI_FIRMWARE