am437x device tree pinmux configure

Hello All,

I want to ask a simple question (it is difficult for me),

From am437x-gp-evm.dts, we can see many pinmux configures, for example:

    dcan0_default: dcan0_default_pins {
        pinctrl-single,pins = <
            0x178 (PIN_OUTPUT_PULLDOWN | MUX_MODE2) /* uart1_ctsn.d_can0_tx */
            0x17c (PIN_INPUT_PULLUP | MUX_MODE2) /* uart1_rtsn.d_can0_rx */
        >;
    };

I know the 0x178 and 0x17c represents uart1_ctsn pin and uart1_rtsn pin, But I don't know where this number came from, and HOW to calculate this number for other pins? Is there a document? I searched many documents but not helped.

Thanks and it would be appreciate for any help.

Kinly