[PATCH 1/3] ARM: dts: stm32: update uart4 pin configuration for low power on stm32mp157

[Erwan Le Ray]

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

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

diff --git a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi 
b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
index 7eb858732d6d..7cf535dc05f5 100644
--- a/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
+++ b/arch/arm/boot/dts/stm32mp15-pinctrl.dtsi
@@ -1648,6 +1648,23 @@
                };
        };
 
+       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 */
+                   };
+       };
+
        uart4_pins_b: uart4-1 {
                pins1 {
                        pinmux = <STM32_PINMUX('D', 1, AF8)>; /* UART4_TX */
-- 
2.17.1