NPU‘s 24MHz clock not work

[hptsf]

the pin REFCLK_OUT don't have any output, and it should output 24MHz pulse

I have config the" pinctrl-names = "default"; pinctrl-0 = <&npu_ref_clk>;

npu_clk {
	npu_ref_clk: npu-ref-clk {
	     rockchip,pins =
		     <0 RK_PA2 1 &pcfg_pull_none>;
	};
};

" in dts file.

[hptsf]

Any comment?