imx8qmmek ddr scaling frequency

[lorenzo_sarchi]

Good morning,

I have an imx8qmmek, image built with Yocto Sumo, kernel 4.14.98_2.0.0_ga.

I would need to modify the ddr bus frequency, but at the i.MX_Linux_User_Guide manual, paragraph 6.3, I see that "This release does not support the bus frequency scaling feature on i.MX8QuadXPLus and i.MX8QuadMax".

So, does there is a Release in which this feature is available in imx8qmmek too ?

If not, does there is a doc (or patch) for taking some hints?

Thanks and Best Regards,

Lorenzo

[weidong_sun]

Hi lorenzo_sarchi ,

  The latest version of linux BSP, L5.4.70_2.3.0 still doesn't support bus frequency scaling feature on i.MX8QM/i.MX8QX, no patch for it.

Hope the information is helpful to you.

Have a nice day!

B.R,

Weidong

[lorenzo_sarchi]

Do you have an hint to give me for scaling the frequency?

I mean: files to look at, suggestions,...

This is really important for us.

Regards,

Lorenzo