samples: drivers: spi_bitbang: Enable sample on nrf54* targets

Add overlays required to run the sample on
- nrf54h20dk/nrf54h20/cpuapp,
- nrf54l15dk/nrf54l15/cpuapp,
- nrf54lm20dk/nrf54lm20a/cpuapp.

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

Author: nordic-segl

samples/drivers/spi_bitbang/boards/nrf54h20dk_nrf54h20_cpuapp.overlay

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Test requires loopback between P0.06 and P0.07.
+ * No other driver on SPI_CLK and SPI_CS.
+ */
+
+/ {
+	spibb0: spibb0 {
+		compatible = "zephyr,spi-bitbang";
+		status="okay";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		clk-gpios = <&gpio0 0 GPIO_ACTIVE_HIGH>;
+		mosi-gpios = <&gpio0 6 GPIO_ACTIVE_HIGH>;
+		miso-gpios = <&gpio0 7 GPIO_ACTIVE_HIGH>;
+		cs-gpios = <&gpio0 8 GPIO_ACTIVE_LOW>;
+	};
+};

samples/drivers/spi_bitbang/boards/nrf54l15dk_nrf54l15_cpuapp.overlay

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Test requires loopback between P1.10 and P1.11
+ * No other driver on SPI_CLK and SPI_CS.
+ */
+
+/ {
+	spibb0: spibb0 {
+		compatible = "zephyr,spi-bitbang";
+		status="okay";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		clk-gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
+		mosi-gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+		miso-gpios = <&gpio1 11 GPIO_ACTIVE_HIGH>;
+		cs-gpios = <&gpio1 14 GPIO_ACTIVE_LOW>;
+	};
+};

samples/drivers/spi_bitbang/boards/nrf54lm20dk_nrf54lm20a_cpuapp.overlay

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/*
+ * Test requires loopback between P1.13 and P1.14
+ * No other driver on SPI_CLK and SPI_CS.
+ */
+
+/ {
+	spibb0: spibb0 {
+		compatible = "zephyr,spi-bitbang";
+		status="okay";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		clk-gpios = <&gpio1 23 GPIO_ACTIVE_HIGH>;
+		mosi-gpios = <&gpio1 13 GPIO_ACTIVE_HIGH>;
+		miso-gpios = <&gpio1 14 GPIO_ACTIVE_HIGH>;
+		cs-gpios = <&gpio1 30 GPIO_ACTIVE_LOW>;
+	};
+};

samples/drivers/spi_bitbang/sample.yaml

@@ -6,7 +6,14 @@ tests:
       - drivers
       - spi
       - gpio
-    platform_allow: nrf52840dk/nrf52840
+    platform_allow:
+      - nrf52840dk/nrf52840
+      - nrf54h20dk/nrf54h20/cpuapp
+      - nrf54l15dk/nrf54l15/cpuapp
+      - nrf54lm20dk/nrf54lm20a/cpuapp
+    integration_platforms:
+      - nrf52840dk/nrf52840
+      - nrf54l15dk/nrf54l15/cpuapp
     depends_on: gpio
     harness: console
     harness_config: