I2C DTS Pin Numbers

In the DTS file for I2C, how do you set the port of the pin specified?  

&i2c0 {
compatible = "nordic,nrf-twi";
status = "okay";
sda-pin = <26>;
scl-pin = <27>;
};

In my custom board, SDA is 1.07 and SCL is 0.20.

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