Changing the frequency tuning on IMX6 SX sabre board

[achyut_hegde]

Hello everyone,

I am using IMX6 SX sabre board to operate with a peripheral which uses ultra high speed SDIO bus.

I am able to tune the frequency from 198MHz to 99MHz. But I am not able to get a clock frequency at 150MHz which I specifically need for the peripheral to work. Is there any way to change this in the kernel driver or DTS? I am building the image using yocto framework.

Thanks,

Achyut

[gusarambula]

Hello Achyut,

Just keep in mind that not all frequencies are achievable. It depends on the available step and divisors. You can see the clock tree on Figure 19-2 of the i.MX6SoloX Reference Manual.

https://www.nxp.com/webapp/Download?colCode=IMX6SXRM

150Mhz may not be achievable, but 149Mhz should be by deriving the USDHC clock from PLL2 PFD0 and setting the PFD_FRAC to 32. Please keep in mind that this would change all clocks that derivate from PLL2 PFD0, which might affect other modules.

I hope this helps!

Regards,