libraries: SPI: Hanlde multiple SPI instances

Create multiple SPI instance if spis array contains plural elements.
Declare these as 'SPI1', 'SPI2', ..., from second element of the array.
(First element is already declare as 'SPI'.)

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@gmail.com>

Author: soburi

libraries/SPI/SPI.cpp

@@ -121,5 +121,28 @@ void arduino::ZephyrSPI::begin() {}
 
 void arduino::ZephyrSPI::end() {}
 
+#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), spis)
+#if (DT_PROP_LEN(DT_PATH(zephyr_user), spis) > 1)
+#define ARDUINO_SPI_DEFINED_0 1
+#define DECL_SPI_0(n, p, i)   arduino::ZephyrSPI SPI(DEVICE_DT_GET(DT_PHANDLE_BY_IDX(n, p, i)));
+#define DECL_SPI_N(n, p, i)   arduino::ZephyrSPI SPI##i(DEVICE_DT_GET(DT_PHANDLE_BY_IDX(n, p, i)));
+#define DECLARE_WIRE_N(n, p, i)                                                                    \
+        COND_CODE_1(ARDUINO_SPI_DEFINED_##i, (DECL_SPI_0(n, p, i)), (DECL_SPI_N(n, p, i)))
+
+/* Declare SPI, SPI1, SPI2, ... */
+DT_FOREACH_PROP_ELEM(DT_PATH(zephyr_user), spis, DECLARE_SPI_N)
+
+#undef DECLARE_SPI_N
+#undef DECL_SPI_N
+#undef DECL_SPI_0
+#undef ARDUINO_SPI_DEFINED_0
+#else  // PROP_LEN(spis) > 1
+/* When PROP_LEN(spis) == 1, DT_FOREACH_PROP_ELEM work not correctly. */
 arduino::ZephyrSPI
     SPI(DEVICE_DT_GET(DT_PHANDLE_BY_IDX(DT_PATH(zephyr_user), spis, 0)));
+#endif // HAS_PORP(i2cs)
+/* If i2cs node is not defined, tries to use arduino_i2c */
+#elif DT_NODE_EXISTS(DT_NODELABEL(arduino_spi))
+arduino::ZephyrSPI
+    SPI(DEVICE_DT_GET(DT_NODELABEL(arduino_spi)));
+#endif