applications: nrf_desktop: add support for the nRF54LM20 DK

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/app.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include "app_common.dtsi"
+
+/ {
+	hid_dev_0: hid_dev_0 {
+		compatible = "zephyr,hid-device";
+		label = "HID0";
+		protocol-code = "mouse";
+		in-polling-period-us = <125>;
+		in-report-size = <64>;
+	};
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/app_common.dtsi

@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+/* Application does not use cpuflpr core. Assign whole RRAM to cpuapp. */
+&cpuapp_rram {
+	reg = < 0x0 DT_SIZE_K(2036) >;
+};
+
+/ {
+	/* Disable pwmleds and redefine them to align configuration with CAF LEDs requirements. */
+	/delete-node/ pwmleds;
+
+	pwmleds0 {
+		compatible = "pwm-leds";
+		status = "okay";
+
+		pwm_led0: led_pwm_0 {
+			status = "okay";
+			pwms = <&pwm20 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+			label = "LED System State";
+		};
+	};
+
+	pwmleds1 {
+		compatible = "pwm-leds";
+		status = "okay";
+
+		pwm_led1: led_pwm_1 {
+			status = "okay";
+			pwms = <&pwm21 0 PWM_MSEC(20) PWM_POLARITY_NORMAL>;
+			label = "LED Conn State";
+		};
+	};
+};
+
+&pwm20 {
+	status = "okay";
+	pinctrl-0 = <&pwm20_default_alt>;
+	pinctrl-1 = <&pwm20_sleep_alt>;
+	pinctrl-names = "default", "sleep";
+};
+
+&pwm21 {
+	status = "okay";
+	pinctrl-0 = <&pwm21_default_alt>;
+	pinctrl-1 = <&pwm21_sleep_alt>;
+	pinctrl-names = "default", "sleep";
+};
+
+&pinctrl {
+	pwm20_default_alt: pwm20_default_alt {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 1, 22)>;
+		};
+	};
+
+	pwm20_sleep_alt: pwm20_sleep_alt {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 1, 22)>;
+			low-power-enable;
+		};
+	};
+
+	pwm21_default_alt: pwm21_default_alt {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 1, 25)>;
+		};
+	};
+
+	pwm21_sleep_alt: pwm21_sleep_alt {
+		group1 {
+			psels = <NRF_PSEL(PWM_OUT0, 1, 25)>;
+			low-power-enable;
+		};
+	};
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/app_llvm.overlay

@@ -0,0 +1,17 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include "app_common.dtsi"
+
+/ {
+	hid_dev_0: hid_dev_0 {
+		compatible = "zephyr,hid-device";
+		label = "HID0";
+		protocol-code = "mouse";
+		in-polling-period-us = <125>;
+		in-report-size = <64>;
+	};
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/app_release.overlay

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include "app_common.dtsi"
+
+/ {
+	hid_dev_0: hid_dev_0 {
+		compatible = "zephyr,hid-device";
+		label = "HID0";
+		protocol-code = "mouse";
+		in-polling-period-us = <125>;
+		in-report-size = <64>;
+	};
+};
+
+/* For nRF54L, watchdog status is disabled by default. Needs to be enabled in DTS overlay. */
+&wdt31 {
+	status = "okay";
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/buttons_def.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include <caf/gpio_pins.h>
+
+/* This configuration file is included only once from button module and holds
+ * information about pins forming keyboard matrix.
+ */
+
+/* This structure enforces the header file is included only once in the build.
+ * Violating this requirement triggers a multiple definition error at link time.
+ */
+const struct {} buttons_def_include_once;
+
+static const struct gpio_pin col[] = {};
+
+static const struct gpio_pin row[] = {
+	{ .port = 1, .pin = DT_GPIO_PIN(DT_NODELABEL(button0), gpios) },
+	{ .port = 1, .pin = DT_GPIO_PIN(DT_NODELABEL(button1), gpios) },
+	{ .port = 1, .pin = DT_GPIO_PIN(DT_NODELABEL(button2), gpios) },
+	{ .port = 0, .pin = DT_GPIO_PIN(DT_NODELABEL(button3), gpios) },
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/click_detector_def.h

@@ -0,0 +1,25 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include <caf/click_detector.h>
+
+/* This configuration file is included only once from click_detector module
+ * and holds information about click detector configuration.
+ */
+
+/* This structure enforces the header file is included only once in the build.
+ * Violating this requirement triggers a multiple definition error at link time.
+ */
+const struct {} click_detector_def_include_once;
+
+static const struct click_detector_config click_detector_config[] = {
+#if CONFIG_DESKTOP_BLE_PEER_CONTROL
+	{
+		.key_id = CONFIG_DESKTOP_BLE_PEER_CONTROL_BUTTON,
+		.consume_button_event = false,
+	},
+#endif /* CONFIG_DESKTOP_BLE_PEER_CONTROL */
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/hid_keyboard_leds_def.h

@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include "hid_keyboard_leds.h"
+
+/* This configuration file is included only once from hid_state module and holds
+ * information about LEDs associated with HID keyboard LEDs report.
+ */
+
+/* This structure enforces the header file is included only once in the build.
+ * Violating this requirement triggers a multiple definition error at link time.
+ */
+const struct {} hid_keyboard_leds_def_include_once;
+
+static const struct led_effect keyboard_led_on = LED_EFFECT_LED_ON(LED_COLOR(255, 255, 255));
+static const struct led_effect keyboard_led_off = LED_EFFECT_LED_OFF();
+
+/* Map HID keyboard LEDs to application LED IDs. */
+static const uint8_t keyboard_led_map[] = {
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/hid_keymap_def.h

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+#include "hid_keymap.h"
+#include <caf/key_id.h>
+
+/* This configuration file is included only once from hid_state module and holds
+ * information about mapping between buttons and generated reports.
+ */
+
+/* This structure enforces the header file is included only once in the build.
+ * Violating this requirement triggers a multiple definition error at link time.
+ */
+const struct {} hid_keymap_def_include_once;
+
+/*
+ * HID keymap. The Consumer Control keys are defined in section 15 of
+ * the HID Usage Tables document under the following URL:
+ * https://www.usb.org/sites/default/files/hut1_12.pdf
+ */
+static const struct hid_keymap hid_keymap[] = {
+	/* Intentionally left empty. nRF54LM20 DK by default uses all 4 buttons
+	 * only to control generating motion.
+	 */
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/images/mcuboot/app.overlay

@@ -0,0 +1,10 @@
+/*
+ * Copyright (c) 2025 Nordic Semiconductor ASA
+ *
+ * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+ */
+
+/* Application does not use cpuflpr core. Assign whole RRAM to cpuapp. */
+&cpuapp_rram {
+	reg = < 0x0 DT_SIZE_K(2036) >;
+};

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/images/mcuboot/mcuboot_private.pem

@@ -0,0 +1,3 @@
+-----BEGIN PRIVATE KEY-----
+MC4CAQAwBQYDK2VwBCIEIFhR5tisVfxfoqS17OebTkJe5elwdsQj4tTAcGfz0r/r
+-----END PRIVATE KEY-----

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/images/mcuboot/prj.conf

@@ -0,0 +1,51 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+CONFIG_SIZE_OPTIMIZATIONS=y
+
+CONFIG_HW_STACK_PROTECTION=y
+
+CONFIG_MAIN_STACK_SIZE=10240
+CONFIG_BOOT_MAX_IMG_SECTORS=256
+CONFIG_BOOT_BOOTSTRAP=n
+
+CONFIG_BOOT_VERSION_CMP_USE_BUILD_NUMBER=y
+
+CONFIG_FLASH=y
+
+# The following features will be enabled once they are available
+# - HW memory protection with FPROTECT library
+# - Watchdog functionality
+CONFIG_FPROTECT=n
+CONFIG_BOOT_WATCHDOG_FEED=n
+
+# Temporarily replace the HW crypto driver with SW driver until the HW driver is available.
+CONFIG_PSA_CRYPTO_DRIVER_CRACEN=n
+CONFIG_PSA_CRYPTO_DRIVER_OBERON=y
+
+# Reduce memory consumption
+CONFIG_BOOT_BANNER=n
+CONFIG_NCS_BOOT_BANNER=n
+CONFIG_SYS_CLOCK_EXISTS=n
+CONFIG_CLOCK_CONTROL=n
+CONFIG_NRF_GRTC_TIMER=n
+CONFIG_NRF_GRTC_START_SYSCOUNTER=n
+CONFIG_SPI_NOR=n
+CONFIG_GPIO=n
+CONFIG_SERIAL=n
+CONFIG_CONSOLE=n
+CONFIG_UART_CONSOLE=n
+CONFIG_PRINTK=n
+CONFIG_USE_SEGGER_RTT=n
+
+# Use minimal C library instead of the Picolib
+CONFIG_MINIMAL_LIBC=y
+
+# Activate Link Time Optimization (LTO)
+CONFIG_LTO=y
+CONFIG_ISR_TABLES_LOCAL_DECLARATION=y
+
+# Improve debugging experience by disabling reset on fatal error
+CONFIG_RESET_ON_FATAL_ERROR=n

applications/nrf_desktop/configuration/nrf54lm20dk_nrf54lm20a_cpuapp/images/mcuboot/prj_llvm.conf

@@ -0,0 +1,51 @@
+#
+# Copyright (c) 2025 Nordic Semiconductor ASA
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+CONFIG_SIZE_OPTIMIZATIONS_AGGRESSIVE=y
+
+CONFIG_HW_STACK_PROTECTION=y
+
+CONFIG_MAIN_STACK_SIZE=10240
+CONFIG_BOOT_MAX_IMG_SECTORS=256
+CONFIG_BOOT_BOOTSTRAP=n
+
+CONFIG_BOOT_VERSION_CMP_USE_BUILD_NUMBER=y
+
+CONFIG_FLASH=y
+
+# The following features will be enabled once they are available
+# - HW memory protection with FPROTECT library
+# - Watchdog functionality
+CONFIG_FPROTECT=n
+CONFIG_BOOT_WATCHDOG_FEED=n
+
+# Temporarily replace the HW crypto driver with SW driver until the HW driver is available.
+CONFIG_PSA_CRYPTO_DRIVER_CRACEN=n
+CONFIG_PSA_CRYPTO_DRIVER_OBERON=y
+
+# Reduce memory consumption
+CONFIG_BOOT_BANNER=n
+CONFIG_NCS_BOOT_BANNER=n
+CONFIG_SYS_CLOCK_EXISTS=n
+CONFIG_CLOCK_CONTROL=n
+CONFIG_NRF_GRTC_TIMER=n
+CONFIG_NRF_GRTC_START_SYSCOUNTER=n
+CONFIG_SPI_NOR=n
+CONFIG_GPIO=n
+CONFIG_SERIAL=n
+CONFIG_CONSOLE=n
+CONFIG_UART_CONSOLE=n
+CONFIG_PRINTK=n
+CONFIG_USE_SEGGER_RTT=n
+
+# Use minimal C library instead of the Picolib
+CONFIG_MINIMAL_LIBC=y
+
+# Link Time Optimization (LTO) is not supported for the LLVM toolchain variant.
+CONFIG_LTO=n
+CONFIG_ISR_TABLES_LOCAL_DECLARATION=n
+
+# Improve debugging experience by disabling reset on fatal error
+CONFIG_RESET_ON_FATAL_ERROR=n