↓ 1 callersFunctionvcgencmd_measure_clockSee https://elinux.org/RPI_vcgencmd_usage Shows clock frequency, clock can be one of arm, core, h264, isp, v3d, uart, pwm, emmc, pixel, vec, hdmi, dpi
OpenHD/ohd_telemetry/src/internal/onboard_computer_status_rpi.hpp:101