linux-kernel - [PATCH] arm: dts: ti: beagleplay: Fix Ethernet PHY RESET GPIOs

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Message-Id: <20240229-b4-for-v6-9-am65-beagleplay-ethernet-reset-v1-1-b3e4b33378bd@kernel.org>
Date: Thu, 29 Feb 2024 18:25:15 +0200
From: Roger Quadros <rogerq@...nel.org>
To: Nishanth Menon <nm@...com>, Vignesh Raghavendra <vigneshr@...com>, 
 Tero Kristo <kristo@...nel.org>, Rob Herring <robh+dt@...nel.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: srk@...com, s-vadapalli@...com, r-gunasekaran@...com, 
 linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Roger Quadros <rogerq@...nel.org>
Subject: [PATCH] arm: dts: ti: 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.

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.

Signed-off-by: Roger Quadros <rogerq@...nel.org>
---
 arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
index a34e0df2ab86..77240cf3ae4d 100644
--- a/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
+++ b/arch/arm64/boot/dts/ti/k3-am625-beagleplay.dts
@@ -292,6 +292,8 @@ mdio0_pins_default: mdio0-default-pins {
 		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_OUTPUT, 7) /* (AC21) RGMII2_RD2.GPIO1_5 */
 		>;
 	};
 
@@ -383,7 +385,6 @@ 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 */
 		>;
@@ -597,6 +598,9 @@ &cpsw3g_mdio {
 
 	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 {
@@ -615,7 +619,7 @@ &main_gpio0 {
 		"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 */

---
base-commit: bbef42084cc170cbfc035bf784f2ff055c939d7e
change-id: 20240229-b4-for-v6-9-am65-beagleplay-ethernet-reset-098f274fbf15

Best regards,
-- 
Roger Quadros <rogerq@...nel.org>