Clock driver for Memory Mapped Fixed values

modulename: clk-fixed-mmio.ko

configname: CONFIG_COMMON_CLK_FIXED_MMIO

Linux Kernel Configuration
└─>Device Drivers
└─>Common Clock Framework
└─>Device Tree and Open Firmware support
└─>Clock driver for Memory Mapped Fixed values
In linux kernel since version 5.1 (release Date: 2019-05-05)  
Support for Memory Mapped IO Fixed clocks

source code:
drivers/clk/clk-fixed-mmio.c