Raspberry Pi firmware based clock support

modulename: clk-raspberrypi.ko

configname: CONFIG_CLK_RASPBERRYPI

Linux Kernel Configuration
└─>Device Drivers
└─>Common Clock Framework
└─>Raspberry Pi firmware based clock support
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Enable common clock framework support for Raspberry Pi's firmware
dependent clocks

source code:
depends
CONFIG_COMMON_CLK
CONFIG_RASPBERRYPI_FIRMWARE or CONFIG_COMPILE_TEST
NOT CONFIG_RASPBERRYPI_FIRMWARE