boards: nucleo_f302r8: add ST Morpho connector nexus node

Add a new GPIO nexus node for the ST Morpho connector in the board.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>

Author: gmarull

boards/arm/nucleo_f302r8/nucleo_f302r8.dts

@@ -8,6 +8,7 @@
 #include <st/f3/stm32f302X8.dtsi>
 #include <st/f3/stm32f302r(6-8)tx-pinctrl.dtsi>
 #include "arduino_r3_connector.dtsi"
+#include "st_morpho_connector.dtsi"
 
 / {
 	model = "STMicroelectronics STM32F302R8-NUCLEO board";

boards/arm/nucleo_f302r8/st_morpho_connector.dtsi

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2023 Teslabs Engineering S.L.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <zephyr/dt-bindings/gpio/gpio.h>
+#include <zephyr/dt-bindings/gpio/st-morpho-header.h>
+
+/ {
+	st_morpho_header: st-morpho-header {
+		compatible = "st-morpho-header";
+		#gpio-cells = <2>;
+		gpio-map-mask = <ST_MORPHO_PIN_MASK 0x0>;
+		gpio-map-pass-thru = <0x0 GPIO_DT_FLAGS_MASK>;
+		gpio-map = <ST_MORPHO_CN7_1 0 &gpioc 10 0>,
+			   <ST_MORPHO_CN7_2 0 &gpioc 11 0>,
+			   <ST_MORPHO_CN7_3 0 &gpioc 12 0>,
+			   <ST_MORPHO_CN7_4 0 &gpiod 2 0>,
+			   <ST_MORPHO_CN7_13 0 &gpioa 13 0>,
+			   <ST_MORPHO_CN7_15 0 &gpioa 14 0>,
+			   <ST_MORPHO_CN7_17 0 &gpioa 15 0>,
+			   <ST_MORPHO_CN7_21 0 &gpiob 7 0>,
+			   <ST_MORPHO_CN7_23 0 &gpioc 13 0>,
+			   <ST_MORPHO_CN7_25 0 &gpioc 14 0>,
+			   <ST_MORPHO_CN7_27 0 &gpioc 15 0>,
+			   <ST_MORPHO_CN7_28 0 &gpioa 0 0>,
+			   <ST_MORPHO_CN7_29 0 &gpiof 0 0>,
+			   <ST_MORPHO_CN7_30 0 &gpioa 1 0>,
+			   <ST_MORPHO_CN7_31 0 &gpiof 1 0>,
+			   <ST_MORPHO_CN7_32 0 &gpioa 4 0>,
+			   <ST_MORPHO_CN7_34 0 &gpiob 0 0>,
+			   <ST_MORPHO_CN7_35 0 &gpioc 2 0>,
+			   <ST_MORPHO_CN7_36 0 &gpioc 1 0>, /* SB56=ON, SB46=OFF */
+			   <ST_MORPHO_CN7_37 0 &gpioc 3 0>,
+			   <ST_MORPHO_CN7_38 0 &gpioc 0 0>, /* SB51=ON, SB52=OFF */
+			   <ST_MORPHO_CN10_1 0 &gpioc 9 0>,
+			   <ST_MORPHO_CN10_2 0 &gpioc 8 0>,
+			   <ST_MORPHO_CN10_3 0 &gpiob 8 0>,
+			   <ST_MORPHO_CN10_4 0 &gpioc 6 0>,
+			   <ST_MORPHO_CN10_5 0 &gpiob 9 0>,
+			   <ST_MORPHO_CN10_6 0 &gpioc 5 0>,
+			   <ST_MORPHO_CN10_11 0 &gpiob 13 0>,
+			   <ST_MORPHO_CN10_12 0 &gpioa 12 0>,
+			   <ST_MORPHO_CN10_13 0 &gpiob 14 0>,
+			   <ST_MORPHO_CN10_14 0 &gpioa 11 0>,
+			   <ST_MORPHO_CN10_15 0 &gpiob 15 0>,
+			   <ST_MORPHO_CN10_16 0 &gpiob 12 0>,
+			   <ST_MORPHO_CN10_17 0 &gpiob 6 0>,
+			   <ST_MORPHO_CN10_18 0 &gpiob 11 0>,
+			   <ST_MORPHO_CN10_19 0 &gpioc 7 0>,
+			   <ST_MORPHO_CN10_21 0 &gpioa 9 0>,
+			   <ST_MORPHO_CN10_22 0 &gpiob 2 0>,
+			   <ST_MORPHO_CN10_23 0 &gpioa 8 0>,
+			   <ST_MORPHO_CN10_24 0 &gpiob 1 0>,
+			   <ST_MORPHO_CN10_25 0 &gpiob 10 0>,
+			   <ST_MORPHO_CN10_26 0 &gpioa 7 0>,
+			   <ST_MORPHO_CN10_27 0 &gpiob 4 0>,
+			   <ST_MORPHO_CN10_28 0 &gpioa 6 0>,
+			   <ST_MORPHO_CN10_29 0 &gpiob 5 0>,
+			   <ST_MORPHO_CN10_30 0 &gpioa 5 0>,
+			   <ST_MORPHO_CN10_31 0 &gpiob 3 0>,
+			   <ST_MORPHO_CN10_33 0 &gpioa 10 0>,
+			   <ST_MORPHO_CN10_34 0 &gpioc 4 0>,
+			   <ST_MORPHO_CN10_35 0 &gpioa 2 0>,
+			   <ST_MORPHO_CN10_37 0 &gpioa 3 0>;
+	};
+};