Configuring DDR Clock Frequency

[_Vanshika]

I am trying to decrease the DDR Clock Frequency for STM32MP257F-DK board. I used STM32CubeMX Tool to change clock tree and generate the modified device trees and made the required changes, compiled and flashed, but still the ddr clock remains the same. 

My question is:

1. What are the changes to be done to change the ddr clock frequency and if i am following the right path or not?
2. Are there any user space commands I can use to do so?

[_Vanshika]

Hi
I was able to change the frequency in arm trusted firmware but it is still not changed in kernel.

Here the 933MHZ frequency is set, but in kernel when I read clk_rate for ck_icn_ddr it is still 600MHz.

What am I missing and how can i set it properly?