Hi George
one can check processor datasheet and dts fsl-imx8mm.dtsi
A53_0 {
operating-points = <
/* kHz uV */
fsl-imx8mm.dtsi\freescale\dts\boot\arm64\arch - linux-imx - i.MX Linux kernel
cpufreq driver description can be found in Linux Manual in
Linux 4.19.35_1.1.0 Documentation
Best regards
igor
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