MCLK1 pin has no output

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i  used imx6ul with24MHZ Crystal,the pin 37(MCLK1) work as SOC_MCLK to output.But however itried to change my codes,it never output any clock,could you tell me how to setit,thanks!

 

my devices tree is this:

 

sound {
compatible = "fsl,imx6ul-evk-wm8978",
"fsl,imx-audio-wm8978";
model = "wm8978-audio";
cpu-dai = <&sai2>;
audio-codec =