samples: Bluetooth: hci_uart/hci_ipc: CI coverage for nRF53+nRF21 FEM

Add CI coverage for nRF5340 plus nRF21540 FEM usage in
hci_uart plus hci_ipc samples.

The overlay values are inspired from:
https://github.com/nrfconnect/sdk-nrf/tree/
85307a9ca0fb6ba8c61f4bd05b7f866cde42612f/boards/shields/nrf21540ek

Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>

samples/bluetooth/hci_ipc/boards/nrf5340_audio_dk_nrf5340_cpunet_nrf21540_ek.overlay

@@ -0,0 +1,28 @@
+/ {
+	nrf_radio_fem: nrf21540_fem {
+		compatible        = "nordic,nrf21540-fem";
+		tx-en-gpios       = <&arduino_header 11 GPIO_ACTIVE_HIGH>; /* D5 */
+		rx-en-gpios       = <&arduino_header 9  GPIO_ACTIVE_HIGH>; /* D3 */
+		pdn-gpios         = <&arduino_header 15 GPIO_ACTIVE_HIGH>; /* D9 */
+		ant-sel-gpios     = <&arduino_header 10 GPIO_ACTIVE_HIGH>; /* D4 */
+		mode-gpios        = <&arduino_header 8  GPIO_ACTIVE_HIGH>; /* D2 */
+		spi-if            = <&nrf_radio_fem_spi>;
+		supply-voltage-mv = <3000>;
+	};
+};
+
+&spi0 {
+	/* status   = "okay"; */
+	cs-gpios = <&arduino_header 16 GPIO_ACTIVE_LOW>; /* D10 */
+
+	nrf_radio_fem_spi: nrf21540_fem_spi@0 {
+		compatible        = "nordic,nrf21540-fem-spi";
+		/* status            = "okay"; */
+		reg               = <0>;
+		spi-max-frequency = <8000000>;
+	};
+};
+
+&radio {
+	fem = <&nrf_radio_fem>;
+};

samples/bluetooth/hci_ipc/sample.yaml

@@ -82,6 +82,16 @@ tests:
       - nrf5340bsim/nrf5340/cpunet
     integration_platforms:
       - nrf5340dk/nrf5340/cpunet
+  sample.bluetooth.hci_ipc.iso.fem.bt_ll_sw_split:
+    harness: bluetooth
+    tags: bluetooth
+    extra_args:
+      - CONF_FILE="nrf5340_cpunet_iso-bt_ll_sw_split.conf"
+      - DTC_OVERLAY_FILE="./boards/nrf5340_audio_dk_nrf5340_cpunet_nrf21540_ek.overlay"
+    platform_allow:
+      - nrf5340_audio_dk/nrf5340/cpunet
+    integration_platforms:
+      - nrf5340_audio_dk/nrf5340/cpunet
   sample.bluetooth.hci_ipc.df.bt_ll_sw_split:
     harness: bluetooth
     tags: bluetooth

samples/bluetooth/hci_uart/boards/nrf5340_audio_dk_nrf5340_cpuapp_nrf21540_ek.overlay

@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: Apache-2.0 */
+
+/ {
+	gpio_fwd: nrf-gpio-forwarder {
+		compatible = "nordic,nrf-gpio-forwarder";
+		status = "okay";
+
+		nrf21540-gpio-if {
+			gpios = <&arduino_header 11 0>, /* tx-en-gpios */
+				<&arduino_header 9  0>, /* rx-en-gpios */
+				<&arduino_header 15 0>,	/* pdn-gpios */
+				<&arduino_header 10 0>, /* ant-sel-gpios */
+				<&arduino_header 8  0>; /* mode-gpios */
+		};
+
+		nrf21540-spi-if {
+			gpios = <&arduino_header 16 0>, /* cs-gpios */
+				<&gpio0          8  0>, /* SPIM_SCK */
+				<&gpio0          10 0>, /* SPIM_MISO */
+				<&gpio0          9  0>; /* SPIM_MOSI */
+		};
+	};
+};
+
+&uart0 {
+	compatible = "nordic,nrf-uarte";
+	current-speed = <1000000>;
+	status = "okay";
+	hw-flow-control;
+};

samples/bluetooth/hci_uart/sample.yaml

@@ -47,6 +47,16 @@ tests:
     tags:
       - uart
       - bluetooth
+  sample.bluetooth.hci_uart.nrf5340_audio_dk_cpuapp.fem:
+    harness: bluetooth
+    platform_allow:
+      - nrf5340_audio_dk/nrf5340/cpuapp
+    integration_platforms:
+      - nrf5340_audio_dk/nrf5340/cpuapp
+    extra_args: DTC_OVERLAY_FILE=./boards/nrf5340_audio_dk_nrf5340_cpuapp_nrf21540_ek.overlay
+    tags:
+      - uart
+      - bluetooth
   sample.bluetooth.hci_uart.nrf52833.all:
     harness: bluetooth
     platform_allow: nrf52833dk/nrf52833