Added a dtsi file describing GPIO that can be used by the board

zephyr/boards/arm/owntech_board/dts/gpio.dtsi

+/*
+ * Copyright (c) 2022 OwnTech.
+ *
+ * SPDX-License-Identifier: LGLPV2.1
+ */
+
+
+&gpioa {
+	ngpios = <16>;
+};	
+
+&gpiob {
+	ngpios = <16>;
+};
+
+&gpioc {
+	ngpios = <15>;
+};	
+
+&gpiod {
+	ngpios = <3>;
+};	
+
+&gpioe {
+	ngpios = <0>;
+};
+
+&gpiof {
+	ngpios = <0>;
+};
+
+&gpiog {
+	ngpios = <0>;
+};

zephyr/boards/arm/owntech_board/owntech_board.dts

@@ -18,6 +18,7 @@
 #include "dts/adc-channels.dtsi"
 #include "dts/ngnd.dtsi"
 #include "dts/can-standby-switch.dtsi"
+#include "dts/gpio.dtsi"
 
 
 / {