CONFIG_TEGRA_CLK_DFLL (not configurable)

modulename: clk-tegra124-dfll-fcpu.ko

configname: CONFIG_TEGRA_CLK_DFLL

Linux Kernel Configuration
└─>Device Drivers
└─>Common Clock Framework
└─>TEGRA_CLK_DFLL
In linux kernel since version 5.1 (release Date: 2019-05-05)  
source code:
drivers/clk/tegra/clk-tegra124-dfll-fcpu.c
selects
CONFIG_PM_OPP