WIP: nordic: add nRF54L15 and nRF54LM20 platform support and full-duplex I2S loopback

Kconfig.sof

@@ -60,9 +60,7 @@ rsource "Kconfig.xtos"
 
 rsource "src/Kconfig"
 
-if ZEPHYR_SOF_MODULE
-	rsource "Kconfig.zephyr-log"
-endif
+rsource "Kconfig.zephyr-log"
 
 menu "Debug"
 

app/CMakeLists.txt

@@ -2,27 +2,52 @@
 
 cmake_minimum_required(VERSION 3.21.0)
 
-# Board specific overlays (these must be before find_package(Zephyr))
-# -------------------------------------------------------------------
-
-# Intel PTL: if "os_linux_overlay" used, also add "ll_userspace_overlay"
-if(DEFINED EXTRA_CONF_FILE AND (BOARD MATCHES "/ptl" OR BOARD_QUALIFIERS MATCHES "/ptl"))
-  string(FIND "${EXTRA_CONF_FILE}" "os_linux_overlay" _linux_overlay_idx)
-  string(FIND "${EXTRA_CONF_FILE}" "ll_userspace_overlay" _ll_overlay_idx)
-  if(_linux_overlay_idx GREATER_EQUAL 0 AND _ll_overlay_idx LESS 0)
-    list(APPEND EXTRA_CONF_FILE
-      "${CMAKE_CURRENT_SOURCE_DIR}/overlays/ptl/ll_userspace_overlay.conf")
-  endif()
-endif()
-
 find_package(Zephyr HINTS $ENV{ZEPHYR_BASE})
 project(sample_sof)
 
+add_subdirectory(../zephyr sof_zephyr)
+
 target_sources(app PRIVATE
     src/main.c
   )
 
-zephyr_library_include_directories(app PUBLIC
-    ${CMAKE_CURRENT_SOURCE_DIR}/../src/arch/xtensa/include
+
+target_sources_ifdef(CONFIG_USB_DEVICE_STACK_NEXT app PRIVATE
+    src/usbd_init.c
+  )
+
+target_include_directories(app PRIVATE
+    ${CMAKE_CURRENT_SOURCE_DIR}/src
     ${CMAKE_CURRENT_SOURCE_DIR}/../src/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/../zephyr/include
+    ${CMAKE_CURRENT_SOURCE_DIR}/../src/platform/${PLATFORM}/include
+    ${PROJECT_BINARY_DIR}/include/generated
   )
+
+target_link_libraries(app PRIVATE SOF modules_sof)
+if(TARGET uuid_reg_h)
+  add_dependencies(app uuid_reg_h modules_sof)
+endif()
+
+if(CONFIG_XTENSA)
+  target_include_directories(app PRIVATE
+      ${CMAKE_CURRENT_SOURCE_DIR}/../src/arch/xtensa/include
+    )
+endif()
+
+function(sof_append_relative_path_definitions target)
+	get_target_property(sources ${target} SOURCES)
+	foreach(src ${sources})
+		get_filename_component(ABS_PATH ${src} ABSOLUTE)
+		file(RELATIVE_PATH rel ${PROJECT_SOURCE_DIR} ${ABS_PATH})
+		set_property(
+			SOURCE ${src}
+			APPEND
+			PROPERTY COMPILE_DEFINITIONS
+			RELATIVE_FILE="${rel}")
+	endforeach()
+endfunction()
+
+sof_append_relative_path_definitions(app)
+
+

app/Kconfig

@@ -7,6 +7,11 @@ choice COMPILER_CODEGEN_VLIW
 endchoice
 
 source "Kconfig.zephyr"
+source "samples/subsys/usb/common/Kconfig.sample_usbd"
+
+if !ZEPHYR_SOF_MODULE
+rsource "../zephyr/Kconfig"
+endif
 
 if SOC_FAMILY_INTEL_ADSP
 	rsource "boards/intel_adsp/Kconfig.defconfig"

app/boards/nrf54l15dk_nrf54l15_cpuapp.conf

@@ -0,0 +1,64 @@
+# Target Platform & SOF Core
+CONFIG_PLATFORM_NORDIC=y
+CONFIG_PLATFORM_NRF54L15=y
+CONFIG_SOF_FULL_ZEPHYR_APPLICATION=y
+CONFIG_ZEPHYR_NATIVE_DRIVERS=y
+CONFIG_IPC_MAJOR_4=y
+CONFIG_COMP_BASEFW_IPC4=n
+CONFIG_STATIC_PIPELINE=y
+CONFIG_SCHED_CPU_MASK=n
+CONFIG_SYS_HEAP_BIG_ONLY=y
+CONFIG_BUILD_OUTPUT_HEX=y
+CONFIG_BUILD_OUTPUT_BIN=y
+
+# Audio Processing Modules & ARM SIMD Optimizations
+CONFIG_COMP_VOLUME=y
+CONFIG_VOLUME_ARM_SIMD=y
+CONFIG_COMP_IIR=y
+CONFIG_EQ_IIR_ARM_SIMD=y
+CONFIG_FILTER_ARM_SIMD=y
+CONFIG_COMP_FIR=y
+CONFIG_COMP_DRC=y
+CONFIG_DRC_ARM_SIMD=y
+CONFIG_COMP_CROSSOVER=y
+CONFIG_COMP_DCBLOCK=y
+CONFIG_DCBLOCK_ARM_SIMD=y
+CONFIG_COMP_MULTIBAND_DRC=y
+CONFIG_COMP_TONE=y
+CONFIG_COMP_LEVEL_MULTIPLIER=y
+CONFIG_COMP_SEL=y
+CONFIG_COMP_MUX=y
+CONFIG_FORMAT_CONVERT_ARM_SIMD=y
+CONFIG_COMP_USB_AUDIO=y
+CONFIG_COMP_BT_AUDIO=n
+CONFIG_COMP_I2S_AUDIO=y
+
+# I2S Hardware Audio Interface (I2S20 Slave)
+CONFIG_I2S=y
+CONFIG_I2S_NRFX=y
+
+# Bluetooth Stack Disabled for Direct I2S Cable Loopback
+CONFIG_BT=n
+
+# Hardware FPU & ARM DSP
+CONFIG_FPU=y
+
+# System Resources & Memory (Lean footprint for 256KB RAM)
+CONFIG_MAIN_STACK_SIZE=4096
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
+CONFIG_ISR_STACK_SIZE=2048
+CONFIG_HW_STACK_PROTECTION=n
+CONFIG_HEAP_MEM_POOL_SIZE=8192
+CONFIG_TICKLESS_KERNEL=n
+CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000
+
+# Logging & UART Console
+CONFIG_LOG=y
+CONFIG_LOG_DEFAULT_LEVEL=3
+CONFIG_LOG_MODE_DEFERRED=y
+CONFIG_LOG_BUFFER_SIZE=4096
+CONFIG_LOG_BACKEND_UART=y
+CONFIG_PRINTK=y
+CONFIG_LOG_PRINTK=y
+CONFIG_EARLY_CONSOLE=y
+

app/boards/nrf54l15dk_nrf54l15_cpuapp.overlay

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2026 Sound Open Firmware (SOF) Project
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+/ {
+	aliases {
+		i2s-node0 = &i2s20;
+	};
+};
+
+&pinctrl {
+	i2s20_default: i2s20_default {
+		group1 {
+			psels = <NRF_PSEL(I2S_SCK_S, 1, 11)>,
+				<NRF_PSEL(I2S_LRCK_S, 1, 12)>,
+				<NRF_PSEL(I2S_SDIN, 1, 9)>,
+				<NRF_PSEL(I2S_SDOUT, 1, 8)>;
+		};
+	};
+
+	i2s20_sleep: i2s20_sleep {
+		group1 {
+			psels = <NRF_PSEL(I2S_SCK_S, 1, 11)>,
+				<NRF_PSEL(I2S_LRCK_S, 1, 12)>,
+				<NRF_PSEL(I2S_SDIN, 1, 9)>,
+				<NRF_PSEL(I2S_SDOUT, 1, 8)>;
+			low-power-enable;
+		};
+	};
+};
+
+&i2s20 {
+	status = "okay";
+	pinctrl-0 = <&i2s20_default>;
+	pinctrl-1 = <&i2s20_sleep>;
+	pinctrl-names = "default", "sleep";
+};

app/boards/nrf54lm20dk_nrf54lm20b_cpuapp.conf

@@ -0,0 +1,81 @@
+# Target Platform & SOF Core
+CONFIG_PLATFORM_NORDIC=y
+CONFIG_PLATFORM_NRF54LM20=y
+CONFIG_SOF_FULL_ZEPHYR_APPLICATION=y
+CONFIG_ZEPHYR_NATIVE_DRIVERS=y
+CONFIG_IPC_MAJOR_4=y
+CONFIG_COMP_BASEFW_IPC4=n
+CONFIG_STATIC_PIPELINE=y
+CONFIG_SCHED_CPU_MASK=n
+CONFIG_SYS_HEAP_BIG_ONLY=y
+CONFIG_BUILD_OUTPUT_HEX=y
+CONFIG_BUILD_OUTPUT_BIN=y
+
+# Audio Processing Modules & ARM SIMD Optimizations
+CONFIG_COMP_VOLUME=y
+CONFIG_VOLUME_ARM_SIMD=y
+CONFIG_COMP_IIR=y
+CONFIG_EQ_IIR_ARM_SIMD=y
+CONFIG_FILTER_ARM_SIMD=y
+CONFIG_COMP_FIR=y
+CONFIG_COMP_DRC=y
+CONFIG_DRC_ARM_SIMD=y
+CONFIG_COMP_CROSSOVER=y
+CONFIG_COMP_DCBLOCK=y
+CONFIG_DCBLOCK_ARM_SIMD=y
+CONFIG_COMP_MULTIBAND_DRC=y
+CONFIG_COMP_TONE=y
+CONFIG_COMP_LEVEL_MULTIPLIER=y
+CONFIG_COMP_SEL=y
+CONFIG_COMP_MUX=y
+CONFIG_FORMAT_CONVERT_ARM_SIMD=y
+CONFIG_COMP_USB_AUDIO=y
+CONFIG_COMP_BT_AUDIO=n
+CONFIG_COMP_I2S_AUDIO=y
+
+# I2S Hardware Audio Interface (TDM Master)
+CONFIG_I2S=y
+CONFIG_I2S_NRF_TDM=y
+CONFIG_I2S_NRF_TDM_TX_BLOCK_COUNT=32
+CONFIG_I2S_NRF_TDM_RX_BLOCK_COUNT=32
+
+# Asynchronous deferred logging for audio real-time performance
+CONFIG_LOG_MODE_DEFERRED=y
+CONFIG_LOG_BUFFER_SIZE=8192
+
+# USB Device & UAC2 Audio Class
+CONFIG_USB_DEVICE_STACK_NEXT=y
+CONFIG_CDC_ACM_SERIAL_INITIALIZE_AT_BOOT=n
+CONFIG_USBD_AUDIO2_CLASS=y
+CONFIG_UDC_DWC2_PTI=y
+CONFIG_SAMPLE_USBD_VID=0x1915
+CONFIG_SAMPLE_USBD_PID=0x5420
+CONFIG_SAMPLE_USBD_PRODUCT="Nordic nRF54LM20 SOF UAC2"
+
+# Bluetooth Stack Disabled for Direct I2S Cable Loopback
+CONFIG_BT=n
+
+# Hardware FPU & ARM DSP
+CONFIG_FPU=y
+
+# MPU Null-Pointer Detection override (0x0-0x400 unmapped on LM20)
+CONFIG_NULL_POINTER_EXCEPTION_DETECTION_NONE=y
+
+# System Resources & Memory (512KB RAM)
+CONFIG_MAIN_STACK_SIZE=8192
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096
+CONFIG_ISR_STACK_SIZE=4096
+CONFIG_HW_STACK_PROTECTION=n
+CONFIG_HEAP_MEM_POOL_SIZE=16384
+CONFIG_TICKLESS_KERNEL=n
+CONFIG_SYS_CLOCK_TICKS_PER_SEC=1000
+
+
+# Logging & UART Console
+CONFIG_LOG=y
+CONFIG_LOG_DEFAULT_LEVEL=3
+CONFIG_LOG_MODE_IMMEDIATE=y
+CONFIG_LOG_BACKEND_UART=y
+CONFIG_PRINTK=y
+CONFIG_LOG_PRINTK=y
+CONFIG_EARLY_CONSOLE=y