[nrf fromlist] tests: drivers: spi: Tests SPI at 16/32/64 MHz on nRF54 devices

Extend spi_loopback test on nRF54 chip family.
Add configurations to run this test at 8/16/32/64 MHz.

Upstream PR #: 86010

Signed-off-by: Sebastian Głąb <[email protected]>

Author: nordic-segl

tests/drivers/spi/spi_loopback/boards/nrf54h20dk_nrf54h20_cpuapp_fast.overlay

@@ -40,7 +40,7 @@
 		reg = <0>;
 		spi-max-frequency = <DT_FREQ_M(4)>;
 	};
-	fast@0 {
+	dut_fast: fast@0 {
 		compatible = "test-spi-loopback-fast";
 		reg = <0>;
 		spi-max-frequency = <DT_FREQ_M(8)>;

tests/drivers/spi/spi_loopback/boards/nrf54l15dk_nrf54l15_cpuapp.overlay

@@ -23,6 +23,8 @@
 	};
 };
 
+/delete-node/ &mx25r64;
+
 &spi00 {
 	status = "okay";
 	pinctrl-0 = <&spi00_default>;
@@ -35,7 +37,7 @@
 		reg = <0>;
 		spi-max-frequency = <DT_FREQ_M(2)>;
 	};
-	fast@0 {
+	dut_fast: fast@0 {
 		compatible = "test-spi-loopback-fast";
 		reg = <0>;
 		spi-max-frequency = <DT_FREQ_M(4)>;

tests/drivers/spi/spi_loopback/boards/nrf54l20pdk_nrf54l20_cpuapp.overlay

@@ -35,7 +35,7 @@
 		reg = <0>;
 		spi-max-frequency = <DT_FREQ_M(2)>;
 	};
-	fast@0 {
+	dut_fast: fast@0 {
 		compatible = "test-spi-loopback-fast";
 		reg = <0>;
 		spi-max-frequency = <DT_FREQ_M(4)>;

tests/drivers/spi/spi_loopback/boards/nrf_at_16mhz.overlay

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+&dut_fast {
+	spi-max-frequency = <DT_FREQ_M(16)>;
+};

tests/drivers/spi/spi_loopback/boards/nrf_at_32mhz.overlay

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+&dut_fast {
+	spi-max-frequency = <DT_FREQ_M(32)>;
+};

tests/drivers/spi/spi_loopback/boards/nrf_at_64mhz.overlay

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+&dut_fast {
+	spi-max-frequency = <DT_FREQ_M(64)>;
+};

tests/drivers/spi/spi_loopback/boards/nrf_at_8mhz.overlay

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+
+&dut_fast {
+	spi-max-frequency = <DT_FREQ_M(8)>;
+};

tests/drivers/spi/spi_loopback/testcase.yaml

@@ -202,10 +202,48 @@ tests:
     filter: CONFIG_DT_HAS_NXP_FLEXIO_ENABLED and
             CONFIG_DT_HAS_NXP_FLEXIO_SPI_ENABLED
     platform_allow: mimxrt1064_evk
-  drivers.spi.nrf_fast:
+  drivers.spi.nrf54h_fast_8mhz:
     extra_args: DTC_OVERLAY_FILE="boards/nrf54h20dk_nrf54h20_cpuapp_fast.overlay"
     platform_allow:
       - nrf54h20dk/nrf54h20/cpuapp
+  drivers.spi.nrf54h_fast_16mhz:
+    extra_args:
+      - DTC_OVERLAY_FILE="boards/nrf54h20dk_nrf54h20_cpuapp_fast.overlay"
+      - EXTRA_DTC_OVERLAY_FILE="boards/nrf_at_16mhz.overlay"
+    platform_allow:
+      - nrf54h20dk/nrf54h20/cpuapp
+  drivers.spi.nrf54h_fast_32mhz:
+    extra_args:
+      - DTC_OVERLAY_FILE="boards/nrf54h20dk_nrf54h20_cpuapp_fast.overlay"
+      - EXTRA_DTC_OVERLAY_FILE="boards/nrf_at_32mhz.overlay"
+    platform_allow:
+      - nrf54h20dk/nrf54h20/cpuapp
+  drivers.spi.nrf54h_fast_64mhz:
+    extra_args:
+      - DTC_OVERLAY_FILE="boards/nrf54h20dk_nrf54h20_cpuapp_fast.overlay"
+      - EXTRA_DTC_OVERLAY_FILE="boards/nrf_at_64mhz.overlay"
+    platform_allow:
+      - nrf54h20dk/nrf54h20/cpuapp
+  drivers.spi.nrf54l_8mhz:
+    extra_args: EXTRA_DTC_OVERLAY_FILE="boards/nrf_at_8mhz.overlay"
+    platform_allow:
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
+  drivers.spi.nrf54l_16mhz:
+    extra_args: EXTRA_DTC_OVERLAY_FILE="boards/nrf_at_16mhz.overlay"
+    platform_allow:
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
+  drivers.spi.nrf54l_32mhz:
+    extra_args: EXTRA_DTC_OVERLAY_FILE="boards/nrf_at_32mhz.overlay"
+    platform_allow:
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
+  drivers.spi.nrf54l_64mhz:
+    extra_args: EXTRA_DTC_OVERLAY_FILE="boards/nrf_at_64mhz.overlay"
+    platform_allow:
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54l20pdk/nrf54l20/cpuapp
   drivers.spi.ke1xz_flexio_spi.loopback:
     extra_args: DTC_OVERLAY_FILE="boards/frdm_ke1xz_flexio_spi.overlay"
     filter: CONFIG_DT_HAS_NXP_FLEXIO_ENABLED and