ARM: dts: stm32: add usart3 node to stm32mp157c-ev1

Adds the usart3 node to stm32mp157c-ev1 board. usart3 pins are connected to
GPIO Expansion connector. usart3 is disabled by default.

Signed-off-by: Erwan Le Ray <erwan.leray@st.com>
Signed-off-by: Alexandre Torgue <alexandre.torgue@st.com>

diff --git a/arch/arm/boot/dts/stm32mp157c-ev1.dts b/arch/arm/boot/dts/stm32mp157c-ev1.dts
index b190565..85628e1 100644 (file)
--- a/arch/arm/boot/dts/stm32mp157c-ev1.dts
+++ b/arch/arm/boot/dts/stm32mp157c-ev1.dts
@@ -19,6 +19,7 @@
 
        aliases {
                serial0 = &uart4;
+               serial1 = &usart3;
                ethernet0 = &ethernet0;
        };
 
@@ -341,6 +342,20 @@
        };
 };
 
+&usart3 {
+       pinctrl-names = "default", "sleep", "idle";
+       pinctrl-0 = <&usart3_pins_b>;
+       pinctrl-1 = <&usart3_sleep_pins_b>;
+       pinctrl-2 = <&usart3_idle_pins_b>;
+       /*
+        * HW flow control USART3_RTS is optional, and isn't default wired to
+        * the connector. SB23 needs to be soldered in order to use it, and R77
+        * (ETH_CLK) should be removed.
+        */
+       uart-has-rtscts;
+       status = "disabled";
+};
+
 &usbh_ehci {
        phys = <&usbphyc_port0>;
        status = "okay";