arm64: dts: ti: k3-am625-beagleplay: Fix Ethernet PHY RESET GPIOs

The RESET GPIO pinmux should be part of MDIO bus node
so that they can be in the right state before the PHY
can be probed via MDIO bus scan.

The GPIO pin should be setup with PIN_INPUT so that
input circuitry is enabled in case software wants to
check pin status. Without this, incorrect status is shown
in /sys/kernel/debug/gpio.

Add GPIO reset for the Gigabit Ethernet PHY. As per
RTL8211F datasheet, reset assert width is 10ms and
PHY registers can be access accessed after 50ms of
reset deassert.

Fixes: f5a731f ("arm64: dts: ti: Add k3-am625-beagleplay")
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Link: https://lore.kernel.org/r/20240305-b4-for-v6-9-am65-beagleplay-ethernet-reset-v2-1-2bf463a7bf13@kernel.org
Signed-off-by: Nishanth Menon <nm@ti.com>

Author: rogerq

arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts

@@ -289,6 +289,8 @@
 		pinctrl-single,pins = <
 			AM62X_IOPAD(0x0160, PIN_OUTPUT, 0) /* (AD24) MDIO0_MDC */
 			AM62X_IOPAD(0x015c, PIN_INPUT, 0) /* (AB22) MDIO0_MDIO */
+			AM62X_IOPAD(0x003c, PIN_INPUT, 7) /* (M25) GPMC0_AD0.GPIO0_15 */
+			AM62X_IOPAD(0x018c, PIN_INPUT, 7) /* (AC21) RGMII2_RD2.GPIO1_5 */
 		>;
 	};
 
@@ -380,7 +382,6 @@
 			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 */
 		>;
@@ -594,6 +595,9 @@
 
 	cpsw3g_phy0: ethernet-phy@0 {
 		reg = <0>;
+		reset-gpios = <&main_gpio0 15 GPIO_ACTIVE_LOW>;
+		reset-assert-us = <10000>;
+		reset-deassert-us = <50000>;
 	};
 
 	cpsw3g_phy1: ethernet-phy@1 {
@@ -612,7 +616,7 @@
 		"USR0", "USR1", "USR2", "USR3", "", "", "USR4",	/* 3-9 */
 		"EEPROM_WP",					/* 10 */
 		"CSI2_CAMERA_GPIO1", "CSI2_CAMERA_GPIO2",	/* 11-12 */
-		"CC1352P7_BOOT", "CC1352P7_RSTN", "", "", "",	/* 13-17 */
+		"CC1352P7_BOOT", "CC1352P7_RSTN", "GBE_RSTN", "", "",	/* 13-17 */
 		"USR_BUTTON", "", "", "", "", "", "", "", "",	/* 18-26 */
 		"", "", "", "", "", "", "", "", "", "HDMI_INT",	/* 27-36 */
 		"", "VDD_WLAN_EN", "", "", "WL_IRQ", "GBE_INTN",/* 37-42 */