How can I control RAM DVFS on Samsung Galaxy?

I have a rooted **Samsung Galaxy S22 Ultra** (**SoC: Snapdragon 8 Gen 1**) and want to control RAM clock frequency (DVFS). How can I perform RAM DVFS on a Samsung Galaxy smartphone? First of all, I tried searching available governors. And the followings are the governors of S22 Ultra.

/sys/devices/platform/soc/1d84000.ufshc/devfreq/1d84000.ufshc/available_governors
/sys/devices/platform/soc/3d00000.qcom,kgsl-3d0/kgsl-busmon/devfreq/kgsl-busmon/available_governors
/sys/devices/platform/soc/3d00000.qcom,kgsl-3d0/devfreq/3d00000.qcom,kgsl-3d0/available_governors

By the way, 1d84000.ufshc is related to ufs storage, and 3d00000.qcom,kgsl-3d0 is related to GPU. Thus, there is no system file related to LPDDR. Besides, I found a directory /sys/devices/system/cpu/bus_dcvs/DDR also. However, the system files on this directory do not allow files modified. Additionally, at soc:qcom,memlat:ddr:gold of the previous directory, I tried modifying max_freq system file though. The result was not changed. Is there anyone who knows about how to control **Memory DVFS on Galaxy S22 Ultra** smartphone???