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About imx7d chip CPU frequency is not normal

Question asked by 其东 刘 on Jun 15, 2020
Latest reply on Jun 16, 2020 by igorpadykov

Hello everyone,
my development board is IMX7DSABRE. Linux kernel version is 4.9.88
During use, we found that the CPU model is MCIMX7D7DVM10SD. The CPU frequency corresponding to this model in the manual should be 1.0GHz, but we can view it through cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq. It is found that the printed CPU frequency is 1.2GHz, and our CPU mode is performance.
Later we use the MCIMX7D5EVM10SD chip. In the performance mode of the CPU, its frequency is still 1.2GHz. This data is inconsistent with the data in the manual. Why is this?