CONFIG_CLK_IMX6SX (not configurable)

modulename: clk-imx6sx.ko

configname: CONFIG_CLK_IMX6SX

Linux Kernel Configuration
└─>Device Drivers
└─>Common Clock Framework
└─>CLK_IMX6SX
In linux kernel since version 5.1 (release Date: 2019-05-05)  
source code:
drivers/clk/imx/clk-imx6sx.c
selects
CONFIG_MXC_CLK