modules: hal_silabs: Add stubs to support CONFIG_BUILD_ONLY_NO_BLOBS

Add empty function stubs to support building with the newly introduced
CONFIG_BUILD_ONLY_NO_BLOBS option.

Signed-off-by: Johan Hedberg <johan.hedberg@silabs.com>

drivers/bluetooth/hci/Kconfig

@@ -119,7 +119,7 @@ config BT_SILABS_EFR32
 	bool
 	default y
 	depends on DT_HAS_SILABS_BT_HCI_EFR32_ENABLED
-	depends on ZEPHYR_HAL_SILABS_MODULE_BLOBS
+	depends on ZEPHYR_HAL_SILABS_MODULE_BLOBS || BUILD_ONLY_NO_BLOBS
 	depends on !PM || SOC_GECKO_PM_BACKEND_PMGR
 	select SOC_GECKO_USE_RAIL
 	select MBEDTLS

modules/hal_silabs/simplicity_sdk/CMakeLists.txt

@@ -27,11 +27,13 @@ string(SUBSTRING ${CONFIG_SOC_SERIES} 7 2 SILABS_DEVICE_FAMILY_NUMBER)
 set(SILABS_DEVICE_PART_NUMBER ${CONFIG_SOC_PART_NUMBER})
 
 function(add_prebuilt_library lib_name prebuilt_path)
-  add_library(${lib_name} STATIC IMPORTED GLOBAL)
-  set_target_properties(${lib_name} PROPERTIES
-    IMPORTED_LOCATION ${BLOBS_DIR}/${prebuilt_path}
-  )
-  zephyr_link_libraries(${lib_name})
+  if(NOT CONFIG_BUILD_ONLY_NO_BLOBS)
+    add_library(${lib_name} STATIC IMPORTED GLOBAL)
+    set_target_properties(${lib_name} PROPERTIES
+      IMPORTED_LOCATION ${BLOBS_DIR}/${prebuilt_path}
+    )
+    zephyr_link_libraries(${lib_name})
+  endif()
 endfunction()
 
 if(CONFIG_SOC_GECKO_HAS_RADIO)
@@ -223,3 +225,8 @@ zephyr_library_sources_ifdef(CONFIG_ENTROPY_GECKO_SE
 )
 
 zephyr_library_sources(src/sl_memory_manager_shim.c)
+
+zephyr_library_sources_ifdef(
+  CONFIG_BUILD_ONLY_NO_BLOBS
+  src/blob_stubs.c
+)

modules/hal_silabs/simplicity_sdk/src/blob_stubs.c

@@ -0,0 +1,146 @@
+/*
+ * Copyright (c) 2024 Silicon Laboratories Inc.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Empty function stubs to enable building with CONFIG_BUILD_ONLY_NO_BLOBS.
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <sl_status.h>
+
+struct RAIL_TxPowerCurvesConfigAlt {
+};
+
+void RAIL_VerifyTxPowerCurves(const struct RAIL_TxPowerCurvesConfigAlt *config)
+{
+}
+
+void RAIL_EnablePaCal(bool enable)
+{
+}
+
+int16_t sl_btctrl_hci_receive(uint8_t *data, int16_t len, bool lastFragment)
+{
+	return 0;
+}
+
+void BTLE_LL_Process(uint32_t events)
+{
+}
+
+void sl_btctrl_disable_2m_phy(void)
+{
+}
+
+void sl_btctrl_disable_coded_phy(void)
+{
+}
+
+uint32_t sl_btctrl_init_mem(uint32_t memsize)
+{
+	return 0;
+}
+
+void sl_btctrl_configure_le_buffer_size(uint8_t count)
+{
+}
+
+sl_status_t sl_btctrl_init_ll(void)
+{
+	return SL_STATUS_NOT_AVAILABLE;
+}
+
+void sli_btctrl_deinit_mem(void)
+{
+}
+
+void sl_btctrl_init_adv(void)
+{
+}
+
+void sl_btctrl_init_adv_ext(void)
+{
+}
+
+void sl_btctrl_init_scan(void)
+{
+}
+
+void sl_btctrl_init_scan_ext(void)
+{
+}
+
+void sl_btctrl_init_conn(void)
+{
+}
+
+void sl_btctrl_init_phy(void)
+{
+}
+
+void sl_btctrl_init_basic(void)
+{
+}
+
+void sl_btctrl_configure_completed_packets_reporting(uint8_t packets, uint8_t events)
+{
+}
+
+void sl_bthci_init_upper(void)
+{
+}
+
+void sl_btctrl_hci_parser_init_default(void)
+{
+}
+
+void sl_btctrl_hci_parser_init_conn(void)
+{
+}
+
+void sl_btctrl_hci_parser_init_adv(void)
+{
+}
+
+void sl_btctrl_hci_parser_init_phy(void)
+{
+}
+
+void AGC_IRQHandler(void)
+{
+}
+
+void BUFC_IRQHandler(void)
+{
+}
+
+void FRC_IRQHandler(void)
+{
+}
+
+void MODEM_IRQHandler(void)
+{
+}
+
+void PROTIMER_IRQHandler(void)
+{
+}
+
+void RAC_RSM_IRQHandler(void)
+{
+}
+
+void RAC_SEQ_IRQHandler(void)
+{
+}
+
+void SYNTH_IRQHandler(void)
+{
+}
+
+void RDMAILBOX_IRQHandler(void)
+{
+}