tests: drivers: spi loopback test for DMA on ESP32/S2

Add SPI DMA test mode.

Signed-off-by: Lucas Tamborrino <[email protected]>

Author: LucasTambor

tests/drivers/spi/spi_loopback/boards/esp32.overlay

@@ -16,3 +16,7 @@
 		spi-max-frequency = <16000000>;
 	};
 };
+
+&spi3 {
+	dma-enabled;
+};

tests/drivers/spi/spi_loopback/boards/esp32c3_devkitm.conf

@@ -1 +1,2 @@
 CONFIG_SPI_ESP32_INTERRUPT=y
+CONFIG_HEAP_MEM_POOL_SIZE=32768

tests/drivers/spi/spi_loopback/boards/esp32c3_devkitm.overlay

@@ -16,3 +16,10 @@
 		spi-max-frequency = <16000000>;
 	};
 };
+
+&spi2 {
+	dma;
+	dma-clk = <ESP32_GDMA_MODULE>;
+	dma-host = <0>;
+	status = "okay";
+};

tests/drivers/spi/spi_loopback/boards/esp32s2_saola.overlay

@@ -8,11 +8,15 @@
 	slow@0 {
 		compatible = "test-spi-loopback-slow";
 		reg = <0>;
-		spi-max-frequency = <500000>;
+		spi-max-frequency = <100000>;
 	};
 	fast@0 {
 		compatible = "test-spi-loopback-fast";
 		reg = <0>;
 		spi-max-frequency = <16000000>;
 	};
 };
+
+&spi3 {
+	dma-enabled;
+};