[PATCH v2] ARM: dts: stm32: Keep MDIO bus in AF across suspend DH STM32MP13xx DHCOR DHSBC board

[Marek Vasut]

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 at denx.de>
---
Cc: Alexandre Torgue <alexandre.torgue at foss.st.com>
Cc: Christophe Roullier <christophe.roullier at foss.st.com>
Cc: Conor Dooley <conor+dt at kernel.org>
Cc: Krzysztof Kozlowski <krzk+dt at kernel.org>
Cc: Maxime Coquelin <mcoquelin.stm32 at gmail.com>
Cc: Rob Herring <robh at kernel.org>
Cc: devicetree at vger.kernel.org
Cc: kernel at dh-electronics.com
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-stm32 at st-md-mailman.stormreply.com
---
V2: Fixup the eth2_rgmii_sleep_pins_a into AF as well
---
 arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi b/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
index ca19c8c6b6771..62c64e9c2b9f0 100644
--- a/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
+++ b/arch/arm/boot/dts/st/stm32mp13-pinctrl.dtsi
@@ -94,14 +94,20 @@ pins2 {
 	/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 @@ pins2 {
 	/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 */
-- 
2.43.0