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Subject[PATCH v2 02/10] dt-bindings: serial: add optional pinctrl states
Date
From: Bich Hemon <bich.hemon@st.com>

Add options for pinctrl states:
- "sleep" for low power
- "idle" for low power and wakeup capabilities enabled
- "no_console_suspend" for enabling console messages in low power

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

diff --git a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
index 5ec80c1..64a5ea9 100644
--- a/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
+++ b/Documentation/devicetree/bindings/serial/st,stm32-usart.txt
@@ -13,7 +13,14 @@ Required properties:
- clocks: The input clock of the USART instance

Optional properties:
-- pinctrl: The reference on the pins configuration
+- pinctrl-names: Set to "default". An additional "sleep" state can be defined
+ to set pins in sleep state when in low power. In case the device is used as
+ a wakeup source, "idle" state is defined in order to keep RX pin active.
+ For a console device, an optional state "no_console_suspend" can be defined
+ to enable console messages during suspend. Typically, "no_console_suspend" and
+ "default" states can refer to the same pin configuration.
+- pinctrl-n: Phandle(s) pointing to pin configuration nodes.
+ For Pinctrl properties see ../pinctrl/pinctrl-bindings.txt
- st,hw-flow-ctrl: bool flag to enable hardware flow control.
- rs485-rts-delay, rs485-rx-during-tx, rs485-rts-active-low,
linux,rs485-enabled-at-boot-time: see rs485.txt.
@@ -31,8 +38,11 @@ usart4: serial@40004c00 {
reg = <0x40004c00 0x400>;
interrupts = <52>;
clocks = <&clk_pclk1>;
- pinctrl-names = "default";
+ pinctrl-names = "default", "sleep", "idle", "no_console_suspend";
pinctrl-0 = <&pinctrl_usart4>;
+ pinctrl-1 = <&pinctrl_usart4_sleep>;
+ pinctrl-2 = <&pinctrl_usart4_idle>;
+ pinctrl-3 = <&pinctrl_usart4>;
};

usart2: serial@40004400 {
--
1.9.1
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