tests: drivers: spi: enable test spi_loopback

enable test spi_loopback for dspi feature on s32z27x
devices

Signed-off-by: Tu Nguyen Van <tu.nguyenvan@nxp.com>

tests/drivers/spi/spi_loopback/boards/s32z2xxdc2_s32z270_dspi.overlay

@@ -0,0 +1,41 @@
+/*
+ * Copyright 2024 NXP
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+&pinctrl {
+	dspi0_default: dspi0_default {
+		group1 {
+			pinmux = <DSPI_10_SOUT>, <DSPI_10_SCK>;
+			output-enable;
+			current-reference-control;
+			termination-resistor;
+		};
+		group2 {
+			pinmux = <DSPI_10_SIN>;
+			input-enable;
+			current-reference-control;
+			termination-resistor;
+		};
+	};
+};
+
+&dspi0 {
+	pinctrl-0 = <&dspi0_default>;
+	pinctrl-names = "default";
+	clock-frequency = <100000000>;
+	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>;
+	};
+};

tests/drivers/spi/spi_loopback/testcase.yaml

@@ -204,3 +204,9 @@ tests:
   drivers.spi.max32_dma.loopback:
     extra_args: OVERLAY_CONFIG="overlay-max32-spi-dma.conf"
     filter: CONFIG_SOC_FAMILY_MAX32
+  drivers.spi.s32z_dspi.loopback:
+    extra_args:
+      - DTC_OVERLAY_FILE=boards/s32z2xxdc2_s32z270_dspi.overlay
+    platform_allow:
+      - s32z2xxdc2/s32z270/rtu0
+      - s32z2xxdc2/s32z270/rtu1