How can I get the "tegra_car TEGRA210_CLK_CLK_OUT_3" clock frequency at jetson TX1 R28.2?

How can I get the “tegra_car TEGRA210_CLK_CLK_OUT_3” clock frequency at jetson TX1 R28.2?
is use cat command?
How can I get this?

hello sensor_test,

please refer to below,
https://devtalk.nvidia.com/default/topic/1032388/jetson-tx1/why-use-quot-v4l2-ctl-quot-command-get-raw-data-is-alway-zero-at-jetson-tx1-r28-2-/post/5252738/#5252738
thanks