Setting up host side Digital Audio Interface (DAI) in a machine driver

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Under spi@3210000, I have made the following changes:

spi@0 {
			compatible = "cirrus,cs47l35";
			spi-max-frequency = <0x5b8d80>;
			reg = <0x00>;
			phandle = <0x179>;
		};

Is this enough for the SPI node? And I am not able to figure out what phandle is referring to here.