CONFIG_HAVE_LEGACY_CLK (not configurable)

configname: CONFIG_HAVE_LEGACY_CLK

Linux Kernel Configuration
└─>Device Drivers
└─>HAVE_LEGACY_CLK
In linux kernel since version 4.14.326 (release Date: 2023-09-23)  
Select this option when the clock API in <linux/clk.h> is implemented
by platform/architecture code. This method is deprecated. Modern
code should select COMMON_CLK instead and not define a custom
'struct clk'.