From b230e1b21c6217647d8452eab4c43420ef02b58d Mon Sep 17 00:00:00 2001
From: Marek Vasut <marex@denx.de>
Date: Fri, 5 Jul 2024 09:59:10 +0200
Subject: ARM: dts: stm32: Keep MDIO bus in AF across suspend DH STM32MP13xx
 DHCOR DHSBC board

The RTL8211F PHY gets confused when the MDIO bus lines get switched
to ANALOG during suspend/resume cycle. Keep the MDIO and MDC lines
in AF during suspend/resume to avoid confusing the PHY. The PHY can
be brought out of the confused state by restarting auto-negotiation
too, but that seems like an odd workaround and shouldn't be in the
PHY driver.

Signed-off-by: Marek Vasut <marex@denx.de>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
---
 arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

(limited to 'arch/arm/boot/dts')

diff --git a/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi b/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
index c9f588a65094..8db1ec4a3b26 100644
--- a/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
@@ -94,14 +94,20 @@
 	/omit-if-no-ref/
 	eth1_rgmii_sleep_pins_a: eth1-rgmii-sleep-0 {
 		pins1 {
+			pinmux = <STM32_PINMUX('A', 2, AF11)>, /* ETH_MDIO */
+				 <STM32_PINMUX('G', 2, AF11)>; /* ETH_MDC */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <2>;
+		};
+
+		pins2 {
 			pinmux = <STM32_PINMUX('G', 13, ANALOG)>, /* ETH_RGMII_TXD0 */
 				 <STM32_PINMUX('G', 14, ANALOG)>, /* ETH_RGMII_TXD1 */
 				 <STM32_PINMUX('C', 2, ANALOG)>, /* ETH_RGMII_TXD2 */
 				 <STM32_PINMUX('E', 5, ANALOG)>, /* ETH_RGMII_TXD3 */
 				 <STM32_PINMUX('B', 11, ANALOG)>, /* ETH_RGMII_TX_CTL */
 				 <STM32_PINMUX('C', 1, ANALOG)>, /* ETH_RGMII_GTX_CLK */
-				 <STM32_PINMUX('A', 2, ANALOG)>, /* ETH_MDIO */
-				 <STM32_PINMUX('G', 2, ANALOG)>, /* ETH_MDC */
 				 <STM32_PINMUX('C', 4, ANALOG)>, /* ETH_RGMII_RXD0 */
 				 <STM32_PINMUX('C', 5, ANALOG)>, /* ETH_RGMII_RXD1 */
 				 <STM32_PINMUX('B', 0, ANALOG)>, /* ETH_RGMII_RXD1 */
@@ -178,14 +184,20 @@
 	/omit-if-no-ref/
 	eth2_rgmii_sleep_pins_a: eth2-rgmii-sleep-0 {
 		pins1 {
+			pinmux = <STM32_PINMUX('B', 6, AF11)>, /* ETH_MDIO */
+				 <STM32_PINMUX('G', 5, AF10)>; /* ETH_MDC */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <2>;
+		};
+
+		pins2 {
 			pinmux = <STM32_PINMUX('F', 7, ANALOG)>, /* ETH_RGMII_TXD0 */
 				 <STM32_PINMUX('G', 11, ANALOG)>, /* ETH_RGMII_TXD1 */
 				 <STM32_PINMUX('G', 1, ANALOG)>, /* ETH_RGMII_TXD2 */
 				 <STM32_PINMUX('E', 6, ANALOG)>, /* ETH_RGMII_TXD3 */
 				 <STM32_PINMUX('F', 6, ANALOG)>, /* ETH_RGMII_TX_CTL */
 				 <STM32_PINMUX('G', 3, ANALOG)>, /* ETH_RGMII_GTX_CLK */
-				 <STM32_PINMUX('B', 6, ANALOG)>, /* ETH_MDIO */
-				 <STM32_PINMUX('G', 5, ANALOG)>, /* ETH_MDC */
 				 <STM32_PINMUX('F', 4, ANALOG)>, /* ETH_RGMII_RXD0 */
 				 <STM32_PINMUX('E', 2, ANALOG)>, /* ETH_RGMII_RXD1 */
 				 <STM32_PINMUX('H', 6, ANALOG)>, /* ETH_RGMII_RXD2 */
-- 
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