boards: nxp_adsp_rt685: Enable DSP support for i.MX RT685

Add definitions facilitating the use of drivers specific to the RT685
when developing for the mimxrt685_evk/mimxrt685s/hifi4 target.

Signed-off-by: Vit Stanicek <[email protected]>

mcux/CMakeLists.txt

@@ -9,6 +9,10 @@ set(MCUX_SDK_PROJECT_NAME ${ZEPHYR_CURRENT_LIBRARY})
 # MCU_DEVICE_PATH: SOC name without core suffix. Must match the name of the
 #              folder in MCUX HAL. IE MIMXRT595S, or LPC55S36
 
+if((DEFINED CMAKE_C_COMPILER) AND (${CMAKE_C_COMPILER} MATCHES "xtensa"))
+  set(MCUX_IS_DSP true)
+endif()
+
 if(NOT HWMv2)
   # Include HWMv1 logic for MCUX variables
   include(${CMAKE_CURRENT_LIST_DIR}/hwmv1.cmake)
@@ -46,13 +50,24 @@ zephyr_compile_definitions(${MCUX_CPU})
 # Build mcux device-specific objects. Although it is not normal
 # practice, drilling down like this avoids the need for repetitive
 # build scripts for every mcux device.
+
 zephyr_library_sources(mcux-sdk/devices/${MCUX_DEVICE_PATH}/drivers/fsl_clock.c)
 if (${MCUX_DEVICE} MATCHES "LPC|MIMXRT6|MIMXRT5|RW6|MCXN.4.")
-  zephyr_library_sources(mcux-sdk/devices/${MCUX_DEVICE_PATH}/drivers/fsl_power.c)
+  # fsl_power.c does not build on DSPs because of missing symbols in fsl_device_registers.h
+  if(NOT MCUX_IS_DSP)
+    zephyr_library_sources(mcux-sdk/devices/${MCUX_DEVICE_PATH}/drivers/fsl_power.c)
+  endif()
   zephyr_library_sources(mcux-sdk/devices/${MCUX_DEVICE_PATH}/drivers/fsl_reset.c)
   zephyr_library_sources_ifdef(CONFIG_HWINFO_RW61X mcux-sdk/devices/${MCUX_DEVICE}/drivers/fsl_ocotp.c)
 endif()
 
+# i.MXRT500 and i.MXRT600 have DSPs - DSP support expected.
+# Don't include DSP support while building for DSP cores, as it
+# doesn't serve any purpose and depends on fsl_power.c.
+if (${MCUX_DEVICE} MATCHES "MIMXRT6|MIMXRT5" AND NOT MCUX_IS_DSP)
+    zephyr_library_sources(mcux-sdk/devices/${MCUX_DEVICE_PATH}/drivers/fsl_dsp.c)
+endif()
+
 # RT11xx SOC initialization file requires additional drivers, import them
 if (${MCUX_DEVICE} MATCHES "MIMXRT11")
   zephyr_library_sources(mcux-sdk/devices/${MCUX_DEVICE_PATH}/drivers/fsl_romapi.c)

mcux/hal_nxp.cmake

@@ -121,6 +121,8 @@ elseif (CONFIG_SOC_MCXN947_CPU1)
 include(device_system_MCXN947_cm33_core1)
 elseif (CONFIG_SOC_MCXN236)
 include(device_system_MCXN236)
+elseif (CONFIG_SOC_MIMXRT685S_HIFI4)
+include(device_system_MIMXRT685S_dsp)
 else()
 include(device_system)
 endif()
@@ -356,6 +358,7 @@ endif()
 endif()
 
 if(${MCUX_DEVICE} MATCHES "MIMXRT(5|6)")
+  set(CONFIG_USE_driver_pca9420 true)
   include(${CMAKE_CURRENT_LIST_DIR}/mcux-sdk/drivers/lpc_iopctl/driver_lpc_iopctl.cmake)
   zephyr_include_directories(${CMAKE_CURRENT_LIST_DIR}/mcux-sdk/drivers/lpc_iopctl)
 endif()

mcux/mcux-sdk/devices/MIMXRT685S/device_system_MIMXRT685S_dsp.cmake

@@ -0,0 +1,14 @@
+#Description: device_system; user_visible: False
+include_guard(GLOBAL)
+message("device_system component is included.")
+
+target_sources(${MCUX_SDK_PROJECT_NAME} PRIVATE
+    ${CMAKE_CURRENT_LIST_DIR}/system_MIMXRT685S_dsp.c
+)
+
+target_include_directories(${MCUX_SDK_PROJECT_NAME} PUBLIC
+    ${CMAKE_CURRENT_LIST_DIR}/.
+)
+
+
+include(device_CMSIS)