boards: hifive1_revb: add arduino gpio nexus map

Provide the mapping from FE310-G002 GPIO pins to the Arduino Uno
headers.  Note where pins have pre-assigned functions that may
interfere with use as GPIOs with the default pinmux assignments.

Signed-off-by: Peter A. Bigot <[email protected]>

Author: pabigot

boards/riscv/hifive1_revb/hifive1_revb.dts

@@ -36,6 +36,35 @@
 			label = "Red LED";
 		};
 	};
+
+	arduino_header: connector {
+		compatible = "arduino-header-r3";
+		#gpio-cells = <2>;
+		gpio-map-mask = <0xffffffff 0xffffffc0>;
+		gpio-map-pass-thru = <0 0x3f>;
+		gpio-map = /* A0 not connected */
+			   <1 0 &gpio0 9 0>,	/* A1, also CS2 */
+			   <2 0 &gpio0 10 0>,	/* A2, also WF_INT */
+			   <3 0 &gpio0 11 0>,	/* A3 */
+			   <4 0 &gpio0 12 0>,	/* A4 */
+			   <5 0 &gpio0 13 0>,	/* A5 */
+			   <6 0 &gpio0 16 0>,	/* D0, also TX */
+			   <7 0 &gpio0 17 0>,	/* D1, also RX */
+			   <8 0 &gpio0 18 0>,	/* D2 */
+			   <9 0 &gpio0 19 0>,	/* D3 */
+			   <10 0 &gpio0 20 0>,	/* D4 */
+			   <11 0 &gpio0 21 0>,	/* D5 */
+			   <12 0 &gpio0 22 0>,	/* D6 */
+			   <13 0 &gpio0 23 0>,	/* D7 */
+			   <14 0 &gpio0 0 0>,	/* D8 */
+			   <15 0 &gpio0 1 0>,	/* D9 */
+			   <16 0 &gpio0 2 0>,	/* D10 */
+			   <17 0 &gpio0 3 0>,	/* D11, also MOSI */
+			   <18 0 &gpio0 4 0>,	/* D12, also MISO */
+			   <19 0 &gpio0 5 0>,	/* D13, also SCK */
+			   <20 0 &gpio0 12 0>,	/* D14, also SDA */
+			   <21 0 &gpio0 13 0>;	/* D15, also SCL */
+	};
 };
 
 &gpio0 {

boards/riscv/hifive1_revb/hifive1_revb.yaml

@@ -9,3 +9,6 @@ testing:
   ignore_tags:
     - net
     - bluetooth
+supported:
+  - arduino_gpio
+  - gpio