Hi wenming
please check mclk example in imx6qdl-sabresd.dtsi:
linux-imx.git - i.MX Linux Kernel
clocks = <&clks IMX6QDL_CLK_CKO>;
clock-names = "csi_mclk";
also one can attach jtag debugger and test signal using register CCM_CCOSR.
Best regards
igor
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