AM625: Change CPU frequency

Bin,

So it will support DVFS?

Hi Tony,

Dynamic Frequency Scaling will be supported. But I don't see "opp-microvolt" property is defined in the device tree OPP table, so I don't think Dynamic Voltage Scaling is supported.

https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/arch/arm64/boot/dts/ti/k3-am625.dtsi?h=ti-linux-5.10.y#n104

Bin,

Thanks.

I think it is due to the PMIC TPS65219 doesn't support Dynamic Voltage Scaling, which provide TPS6521901/02/03/04 option with fixed Core and DDR voltage.

Yes, I think so.

Hi Tony,

AM62x's power consumption is already very low with a fixed VDD_CORE voltage, does you still require Dynamic Voltage Scaling? What is the power requirement?

Tony,

I received feedback from our HW Power expert, AM62x doesn't support Dynamic Voltage Scaling. It is not about PMIC.

Bin,

If AM62x support Dynamic Frequency Scaling, it is hard to understand not support Dynamic Voltage Scaling,  From SOC perspective, if dynamic change frequency need SW and DM firmware involved, may cause some potential problem, but for Dynamic Voltage Scaling, SOC even doesn't know external voltage changed as long as power supply can maintain SOC activity. if frequency decreased. lower voltage can meet SOC activity.

Hi Tony,

I am looping in our HW expert to comment on the Dynamic Voltage Scaling feature.

Bin,

do you know when release 8.4 SDK, several customers want to change CPU frequency to 1.4GHz, do you know how to do it in current SDK?

Hi Tony,

SDK v8.4 is currently planed to be released by end of September.

At this moment, customers can change CPU frequency to 1.4HGz using k3conf command, just please ensure the VDD_CORE is at 0.85v.

# k3conf set clock 135 0 1400000000