tests: drivers: spi_loopback: Add phyboard_polis

Adds the devicetree overlay and configuration for
phyboard polis to the spi_loopback test.

Signed-off-by: Peter Fecher <[email protected]>

Author: pefech

tests/drivers/spi/spi_loopback/boards/mimx8mm_phyboard_polis_mimx8mm6_m4.conf

@@ -0,0 +1,7 @@
+#
+# Copyright (C) 2024 PHYTEC Messtechnik GmbH
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+CONFIG_SPI_LOOPBACK_MODE_LOOP=y

tests/drivers/spi/spi_loopback/boards/mimx8mm_phyboard_polis_mimx8mm6_m4.overlay

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2024 PHYTEC Messtechnik GmbH
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&ecspi1 {
+	status = "okay";
+
+	slow@0 {
+		compatible = "test-spi-loopback-slow";
+		reg = <0>;
+		spi-max-frequency = <500000>;
+	};
+	fast@0 {
+		compatible = "test-spi-loopback-fast";
+		reg = <0>;
+		spi-max-frequency = <16000000>;
+	};
+};
+
+&gpio2 {
+	status = "okay";
+};
+
+&gpio5 {
+	status = "okay";
+};