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Power Management of DM814x by reducing frequency

Hello,

In our custom board of DM8148, we are not using PMIC chip to control power. Due to that we are trying two approaches:

1) Reducing frequency using Linux governor but not reducing voltage(1.35v)

2) Reducing voltage to 1.1v, but DM will run at highest speed.

I have below questions on both approaches:

1)Is it ok to use any of the one approach to reduce power?

2) From both of the above approaches which approach is good to reduce power and how much power will be reduced?

Thanks & Regards,

Rakesh Modi