2016771_en-US

[#1]

How can I change the PLL output frequency of the i.MX7D

Hellow.

How can I change the PLL output frequency of the i.MX7D.

I couldn't find it in the PLL section of the reference manual.

Thank you.

Re: How can I change the PLL output frequency of the i.MX7D

since you use imx7d, your dts file should includes 7d.dtsi, for 7d cpu frequency settings, you can refer to the 7d.dtsi, for M core, you can download SDK for reference

MCUXpresso SDK Builder

Re: How can I change the PLL output frequency of the i.MX7D

Hi. joanxie.

I understand that it is set in Device-Tree.

However, imx7d.dtsi include imx7s.dtsi and I have made settings there as well, so whitch one takes priority?

The same setting is available in u-boot, but is it also necessary for Linux?

I have one more question.

where do I configure the COrtex-M4?

Thank you.

Re: How can I change the PLL output frequency of the i.MX7D

do you use linux? if yes, you can set this in the dtsi file, find the opp-table 

https://github.com/nxp-imx/linux-imx/blob/lf-6.6.y/arch/arm/boot/dts/nxp/imx/imx7d.dtsi

Re: How can I change the PLL output frequency of the i.MX7D

Hi.  Joanxie.

Please see page 505 of reference manual.

The frequency of "pll_arm_main_clk"  ranges from 800MHz to 1.2GHz, but I whoud like to set it to 800MHz.

Is it possible?

Thank you. 

Re: How can I change the PLL output frequency of the i.MX7D

which pll do you need to change?