modules: openthread: Allow building nrf5 networking backend

Prepared build environment to support building OpenThread
without Zephyr's L2 and IEEE802.15.4 shim layers.
To do it, some of Kconfigs must be cloned into the new
Kconfig file (dedicated to nRF5-driver-based approach)
to meet all OpenThread requirements while NET_L2_OPENTHREAD
is disabled.

- Created Kconfig.nrf5 and Kconfig.nrf5.defconfig files
to define all Kconfig needed by OpenThread that were definied
previously in Zephyr L2 layer's Kconfig file.
- Added OPENTHREAD_NETWORKING_BACKEND choice to switch
between legacy Zephyr Networking layer and new
nRF5-driver-based solution
- Disabled some dependency to Zephyr's L2 layer in the platform
files - this will be fixed in the next phase.

Signed-off-by: Arkadiusz Balys <[email protected]>

Author: ArekBalysNordic

modules/openthread/Kconfig

@@ -1,13 +1,63 @@
 # Copyright (c) 2022 Nordic Semiconductor ASA
 # SPDX-License-Identifier: Apache-2.0
 
+choice OPENTHREAD_NETWORKING_BACKEND
+	prompt "OpenThread networking backend"
+	default OPENTHREAD_NETWORKING_BACKEND_ZEPHYR
+
+config OPENTHREAD_NETWORKING_BACKEND_ZEPHYR
+	bool "Zephyr networking backend"
+	select NET_L2_OPENTHREAD
+	select NETWORKING
+	help
+	  Use Zephyr's networking, L2 and IEEE802.15.4 shim layers for OpenThread stack.
+
+config OPENTHREAD_NETWORKING_BACKEND_NRF5
+	bool "Direct nRF5 radio driver calls"
+	depends on DT_HAS_NORDIC_NRF_IEEE802154_ENABLED
+	select NRF_802154_RADIO_DRIVER if HAS_HW_NRF_RADIO_IEEE802154
+	select NRF_802154_SER_HOST if !HAS_HW_NRF_RADIO_IEEE802154
+	select NRF_802154_RADIO_CONFIG
+
+	select OPENTHREAD
+	select OPENTHREAD_NRF_SECURITY_PSA
+
+	imply FLASH
+	imply FLASH_MAP
+	imply MPU_ALLOW_FLASH_WRITE
+
+	select SETTINGS if FLASH
+	select OPENTHREAD_SETTINGS_RAM if !FLASH
+	select CPP
+	select REBOOT
+	select ENTROPY_GENERATOR
+	help
+	  Use Nordic Semiconductor radio driver directly for OpenThread stack.
+	  This approach does not use Zephyr's L2 networking and IEEE802.15.4 shim layers.
+	  This option simplifies the integration architecture between nRF5 radio driver
+	  and OpenThread stack, and saves RAM and ROM.
+
+	  Use this option only if you do not need to use Zephyr's L2 networking features.
+
+endchoice
+
 config OPENTHREAD
 	bool "OpenThread Support"
 	help
 	  This option enables the OpenThread library
 
 if OPENTHREAD
 
+if OPENTHREAD_NETWORKING_BACKEND_NRF5
+
+rsource "Kconfig.nrf5.defconfig"
+
+menu "OpenThread nrf5"
+rsource "Kconfig.nrf5"
+endmenu
+
+endif
+
 menu "OpenThread stack features"
 rsource "Kconfig.features"
 endmenu

modules/openthread/Kconfig.features

@@ -405,11 +405,3 @@ config OPENTHREAD_VERHOEFF_CHECKSUM
 
 config OPENTHREAD_CLI_VENDOR_EXTENSION
 	string "Path to CMake file to define and link Openthread CLI vendor extension"
-
-config OPENTHREAD_USE_NRF5_RADIO
-	bool "Use Nordic Semiconductor radio driver directly"
-	default y
-	depends on HAS_HW_NRF_RADIO_IEEE802154
-	help
-	  Use explicitly Nordic Semiconductor radio driver for OpenThread stack.
-	  This approach does not use Zephyr's net_pkt and net_time APIs.

modules/openthread/Kconfig.nrf5

@@ -0,0 +1,139 @@
+# Copyright (c) 2021 Nordic Semiconductor
+#
+# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
+#
+
+# The purpose of this file is to define configuration options specific to the
+# Nordic Semiconductor radio driver.
+
+if OPENTHREAD_NETWORKING_BACKEND_NRF5
+
+choice OPENTHREAD_IMPLEMENTATION
+	prompt "OpenThread origin selection"
+	default OPENTHREAD_LIBRARY if OPENTHREAD_LIBRARY_AVAILABLE
+	help
+	  Select OpenThread to use for build. Custom OpenThread implementations
+	  can be added to the application Kconfig.
+
+config OPENTHREAD_SOURCES
+	bool "OpenThread from sources"
+	help
+	  Build Zephyr's OpenThread port from sources.
+
+endchoice
+
+config OPENTHREAD_MANUAL_START
+	bool "Start OpenThread stack manually"
+	help
+	  If enabled, OpenThread stack will have to be configured and
+	  started manually, with respective API calls or CLI/NCP commands.
+	  Otherwise, OpenThread will configure the network parameters and try to
+	  join the Thread network automatically during initialization (using
+	  credentials stored in persistent storage, obtained during
+	  commissioning or pre-commissioned with other Kconfig options,
+	  depending on configuration used).
+
+config OPENTHREAD_SHELL
+	bool "OpenThread shell"
+	depends on SHELL
+
+config OPENTHREAD_CRYPTO_PSA
+	bool "ARM PSA crypto API"
+	depends on MBEDTLS_PSA_CRYPTO_CLIENT
+	select OPENTHREAD_PLATFORM_KEY_REF if !OPENTHREAD_COPROCESSOR_RCP
+	imply OPENTHREAD_PLATFORM_KEYS_EXPORTABLE_ENABLE
+	help
+	  Enable crypto backend library implementation based on ARM PSA crypto
+	  API instead of the default, using mbedTLS.
+
+menuconfig OPENTHREAD_DEBUG
+	bool "OpenThread stack logging support"
+	help
+	  This option enables logging support for OpenThread.
+
+config OPENTHREAD_PLATFORM_INFO
+	string "Platform information for OpenThread"
+	default "NRF"
+	help
+	  Platform information for OpenThread
+
+config OPENTHREAD_CUSTOM_PARAMETERS
+	string "Custom Parameters to pass to OpenThread build system"
+	default ""
+	help
+	  This option is intended for advanced users only.
+	  Pass additional parameters that do not have corresponding Kconfig
+	  options to the OpenThread build system. Separate multiple values with
+	  space " ", for example:
+	  "OPENTHREAD_CONFIG_JOINER_ENABLE=1 OPENTHREAD_CONFIG_JOINER_MAX_CANDIDATES=3"
+
+config OPENTHREAD_NUM_MESSAGE_BUFFERS
+	int "The number of message buffers in the buffer pool"
+	default 128
+	help
+	  "The number of message buffers in the buffer pool."
+
+config OPENTHREAD_MESSAGE_BUFFER_SIZE
+	int "The size of a message buffer in bytes"
+	default 128
+	help
+	  "The size of a message buffer in bytes"
+
+config OPENTHREAD_PLATFORM_MESSAGE_MANAGEMENT
+	bool "Use platform message management"
+	help
+	  The message pool is managed by platform defined logic.
+
+config OPENTHREAD_MAX_STATECHANGE_HANDLERS
+	int "The maximum number of state-changed callback handlers"
+	default 2
+	help
+	  The maximum number of state-changed callback handlers
+	  set using otSetStateChangedCallback.
+
+config OPENTHREAD_TMF_ADDRESS_CACHE_ENTRIES
+	int "The number of EID-to-RLOC cache entries"
+	default 20
+	help
+	  The number of EID-to-RLOC cache entries.
+
+config OPENTHREAD_TMF_ADDRESS_CACHE_MAX_SNOOP_ENTRIES
+	int "The maximum number of EID-to-RLOC cache entries"
+	default 2
+	help
+	  The maximum number of EID-to-RLOC cache entries that can be used for
+	  "snoop optimization" where an entry is created by inspecting a received
+	  message.
+
+config OPENTHREAD_LOG_PREPEND_LEVEL_ENABLE
+	bool "Prepending the log level to all OpenThread log messages"
+	help
+	  When enabled the OpenThread logs will be prepended with the appropriate
+	  log level prefix i.e. [CRIT], [WARN], [NOTE], [INFO], [DEBG].
+
+config OPENTHREAD_MAC_SOFTWARE_ACK_TIMEOUT_ENABLE
+	bool "Software ACK timeout logic"
+	default y
+	help
+	  Set y if the radio supports AckTime event
+
+config OPENTHREAD_MAC_SOFTWARE_RETRANSMIT_ENABLE
+	bool "Software retransmission logic"
+	default y
+	help
+	  Set y if the radio supports tx retry logic with collision avoidance (CSMA)
+
+config OPENTHREAD_MAC_SOFTWARE_CSMA_BACKOFF_ENABLE
+	bool "Software CSMA backoff logic"
+	default y
+	help
+	  Set y to enable software CSMA backoff. The option can be disabled if
+	  the radio has hardware support for this feature (IEEE802154_HW_CSMA).
+
+config OPENTHREAD_PLATFORM_KEYS_EXPORTABLE_ENABLE
+	bool "Make MAC keys exportable"
+	depends on OPENTHREAD_PLATFORM_KEY_REF
+	help
+	  Enable the creation of exportable MAC keys in the OpenThread Key Manager.
+
+endif # OPENTHREAD_USE_NRF5_RADIO