From mboxrd@z Thu Jan  1 00:00:00 1970
From: Erwan Le Ray <erwan.leray@st.com>
Subject: [PATCH v3 07/10] ARM: dts: stm32: update uart4 pin configurations for
 low power
Date: Thu, 13 Jun 2019 15:49:57 +0200
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To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, Maxime Coquelin <mcoquelin.stm32@gmail.com>, Alexandre
 Torgue <alexandre.torgue@st.com>, Rob Herring <robh+dt@kernel.org>, Mark
 Rutland <mark.rutland@arm.com>
Cc: devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Erwan Le Ray <erwan.leray@st.com>, linux-serial@vger.kernel.org, Bich Hemon <bich.hemon@st.com>, Fabrice Gasnier <fabrice.gasnier@st.com>, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org
List-Id: devicetree@vger.kernel.org

Currently, pinctrl states defines only one "sleep" configuration for pins,
no matter the possible uart low power modes (Rx pin always kept active).

Sleep pin configuration is refined for low power modes:
- "sleep" (no wakeup & console suspend enabled): put pins in analog state
  to optimize power
- "idle" (wakeup capability): keep Rx pin in alternate function
- "default" state remains untouched, to be used while the UART is active
  or in case the no_console_suspend mode is enabled

Signed-off-by: Bich Hemon <bich.hemon@st.com>
Signed-off-by: Erwan Le Ray <erwan.leray@st.com>

diff --git a/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi b/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi
index 85c417d..2e1ab1b 100644
--- a/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32mp157-pinctrl.dtsi
@@ -599,6 +599,23 @@
 					bias-disable;
 				};
 			};
+
+			uart4_idle_pins_a: uart4-idle-0 {
+				pins1 {
+					pinmux = <STM32_PINMUX('G', 11, ANALOG)>; /* UART4_TX */
+				};
+				pins2 {
+					pinmux = <STM32_PINMUX('B', 2, AF8)>; /* UART4_RX */
+					bias-disable;
+				};
+			};
+
+			uart4_sleep_pins_a: uart4-sleep-0 {
+				pins {
+					pinmux = <STM32_PINMUX('G', 11, ANALOG)>, /* UART4_TX */
+						 <STM32_PINMUX('B', 2, ANALOG)>; /* UART4_RX */
+				};
+			};
 		};
 
 		pinctrl_z: pin-controller-z@54004000 {
-- 
1.9.1