From a1429f3d3029b65cd4032f6218d5290911377ce4 Mon Sep 17 00:00:00 2001
From: Valentin CARON - foss <valentin.caron@foss.st.com>
Date: Thu, 11 Feb 2021 12:07:03 +0100
Subject: [PATCH] ARM: dts: stm32: fix usart 2 & 3 pinconf to wake up with flow
 control

Modify usart 2 & 3 pins to allow wake up from low power mode while the
hardware flow control is activated. UART RTS pin need to stay configure
in idle mode to receive characters in order to wake up.

Fixes: 842ed898a757 ("ARM: dts: stm32: add usart2, usart3 and uart7 pins in stm32mp15-pinctrl")

Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
---
 arch/arm/boot/dts/stm32mp15-pinctrl.dtsi | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
index 7b4249ed19833..060baa8b7e9d4 100644
--- a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
@@ -1891,10 +1891,15 @@
 	usart2_idle_pins_c: usart2-idle-2 {
 		pins1 {
 			pinmux = <STM32_PINMUX('D', 5, ANALOG)>, /* USART2_TX */
-				 <STM32_PINMUX('D', 4, ANALOG)>, /* USART2_RTS */
 				 <STM32_PINMUX('D', 3, ANALOG)>; /* USART2_CTS_NSS */
 		};
 		pins2 {
+			pinmux = <STM32_PINMUX('D', 4, AF7)>; /* USART2_RTS */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <3>;
+		};
+		pins3 {
 			pinmux = <STM32_PINMUX('D', 6, AF7)>; /* USART2_RX */
 			bias-disable;
 		};
@@ -1940,10 +1945,15 @@
 	usart3_idle_pins_b: usart3-idle-1 {
 		pins1 {
 			pinmux = <STM32_PINMUX('B', 10, ANALOG)>, /* USART3_TX */
-				 <STM32_PINMUX('G', 8, ANALOG)>, /* USART3_RTS */
 				 <STM32_PINMUX('I', 10, ANALOG)>; /* USART3_CTS_NSS */
 		};
 		pins2 {
+			pinmux = <STM32_PINMUX('G', 8, AF8)>; /* USART3_RTS */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins3 {
 			pinmux = <STM32_PINMUX('B', 12, AF8)>; /* USART3_RX */
 			bias-disable;
 		};
@@ -1976,10 +1986,15 @@
 	usart3_idle_pins_c: usart3-idle-2 {
 		pins1 {
 			pinmux = <STM32_PINMUX('B', 10, ANALOG)>, /* USART3_TX */
-				 <STM32_PINMUX('G', 8, ANALOG)>, /* USART3_RTS */
 				 <STM32_PINMUX('B', 13, ANALOG)>; /* USART3_CTS_NSS */
 		};
 		pins2 {
+			pinmux = <STM32_PINMUX('G', 8, AF8)>; /* USART3_RTS */
+			bias-disable;
+			drive-push-pull;
+			slew-rate = <0>;
+		};
+		pins3 {
 			pinmux = <STM32_PINMUX('B', 12, AF8)>; /* USART3_RX */
 			bias-disable;
 		};
-- 
2.30.2