AM625: 使用rmii模式接phy芯片时引脚配置问题

我使用的是AM6254芯片，想通过rmii总线接dp83848芯片，在配置引脚时发现一个问题，只有当把所有的引脚都配置为INPUT模式才能正常通讯，请问是什么原因？

	&cpsw3g {
	pinctrl-names = "default";
	pinctrl-0 = <&rgmii1_pins_default>, <&spe_pins_default>,
		    <&gbe_pmx_obsclk>;
	assigned-clocks = <&k3_clks 157 70>, <&k3_clks 157 20>;
	assigned-clock-parents = <&k3_clks 157 72>, <&k3_clks 157 22>;
};

&cpsw_port1 {
	phy-mode = "rgmii-rxid";
	phy-handle = <&cpsw3g_phy0>;
};
	
	spe_pins_default: spe-pins-default {
		pinctrl-single,pins = <
			AM62X_IOPAD(0x0168, PIN_INPUT, 1) /* (AE21) RGMII2_TXC.RMII2_CRS_DV */
			AM62X_IOPAD(0x0180, PIN_INPUT, 1) /* (AD23) RGMII2_RXC.RMII2_REF_CLK */
			AM62X_IOPAD(0x0184, PIN_INPUT, 1) /* (AE23) RGMII2_RD0.RMII2_RXD0 */
			AM62X_IOPAD(0x0188, PIN_INPUT, 1) /* (AB20) RGMII2_RD1.RMII2_RXD1 */
			AM62X_IOPAD(0x017c, PIN_INPUT, 1) /* (AD22) RGMII2_RX_CTL.RMII2_RX_ER */
			AM62X_IOPAD(0x016c, PIN_INPUT, 1) /* (Y18) RGMII2_TD0.RMII2_TXD0 */
			AM62X_IOPAD(0x0170, PIN_INPUT, 1) /* (AA18) RGMII2_TD1.RMII2_TXD1 */
			AM62X_IOPAD(0x0164, PIN_INPUT, 1) /* (AA19) RGMII2_TX_CTL.RMII2_TX_EN */
			AM62X_IOPAD(0x018c, PIN_OUTPUT, 7) /* (AC21) RGMII2_RD2.GPIO1_5 */
			AM62X_IOPAD(0x0190, PIN_INPUT, 7) /* (AE22) RGMII2_RD3.GPIO1_6 */
			AM62X_IOPAD(0x01f0, PIN_OUTPUT, 5) /* (A18) EXT_REFCLK1.CLKOUT0 */
		>;
	};