IMX6ULL DVFS NOT WORKING

devika_ramesh — Mon, 16 Mar 2020 13:52:29 GMT

We are using IMX6ULL for our custom board and observed that for the frequencies 792MHz & 528MHz , the voltage value is constant (1.275V) in 'userspace' mode.We had given the correct PMIC regulator name in 'cpu0' section of the dts file.We tried changing the content in section 'fsl,soc-operating-points ' of dtsi file also but whatever be the voltage value given in the above mentioned section, the voltage value remained 1.275V itself.Could you please tell us how to enable the DVFS feature?

Re: IMX6ULL DVFS NOT WORKING

igorpadykov — Wed, 18 Mar 2020 00:47:03 GMT

Hi Devika

one can check dts "operating-points" parameter :

    cpus {       cpu0: cpu@0 {..
           operating-points = <
               /* kHz   uV */

imx6ull.dtsi\dts\boot\arm\arch - linux-imx - i.MX Linux kernel

However it should correspond to chip datasheet values given in

Table 10. Operating Ranges

i.MX 6ULL Applications Processor | Single Arm® Cortex®-A7 @ 900 MHz | NXP

Also please check sect.2.5.3.4 Menu Configuration Options attached Linux Manual.

Best regards
igor
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topic Re: IMX6ULL DVFS NOT WORKING in i.MX Processors

IMX6ULL DVFS NOT WORKING

Re: IMX6ULL DVFS NOT WORKING