[nrf fromlist] drivers: nrf_wifi: Restructure to carve out a new nrf70 bus lib

The nrf wifi drivers include code related to qspi/spi bus. This work
moves bus related files to a new nrf70 bus library which is now
independent of the core driver and facilitlates building applications
directly using the bus APIs, agnostic to enabling wifi configs.

Upstream PR #: 82372

Signed-off-by: Bansidhar P.M <[email protected]>
(cherry picked from commit b515453)

Author: bama-nordic

drivers/wifi/nrf_wifi/CMakeLists.txt

@@ -11,7 +11,6 @@ set(FW_BINS_BASE ${ZEPHYR_NRF_WIFI_MODULE_DIR}/zephyr/blobs/wifi_fw_bins)
 
 zephyr_include_directories(
   inc
-  src/qspi/inc
   # for net_sprint_ll_addr
   ${ZEPHYR_BASE}/subsys/net/ip
 )
@@ -24,12 +23,6 @@ zephyr_library_sources_ifdef(CONFIG_NRF70_SR_COEX
   src/coex.c
 )
 
-zephyr_library_sources(
-  src/qspi/src/device.c
-  src/qspi/src/rpu_hw_if.c
-  src/qspi/src/ficr_prog.c
-)
-
 zephyr_library_sources_ifndef(CONFIG_NRF70_OFFLOADED_RAW_TX
   src/fmac_main.c
 )
@@ -65,14 +58,6 @@ zephyr_library_sources_ifdef(CONFIG_NRF70_STA_MODE
 zephyr_library_sources_ifdef(CONFIG_NRF70_STA_MODE
   src/wpa_supp_if.c)
 
-zephyr_library_sources_ifdef(CONFIG_NRF70_ON_QSPI
-  src/qspi/src/qspi_if.c
-)
-
-zephyr_library_sources_ifdef(CONFIG_NRF70_ON_SPI
-  src/qspi/src/spi_if.c
-)
-
 zephyr_library_sources_ifdef(CONFIG_NRF70_UTIL
   src/wifi_util.c
 )
@@ -88,6 +73,8 @@ zephyr_compile_definitions_ifdef(CONFIG_NRF70_ON_QSPI
   -DNRF53_ERRATA_159_ENABLE_WORKAROUND=0
 )
 
+target_link_libraries(nrf_wifi PRIVATE nrf70-buslib)
+
 if (CONFIG_NRF_WIFI_BUILD_ONLY_MODE)
   message(WARNING "
   ------------------------------------------------------------------------

drivers/wifi/nrf_wifi/Kconfig.nrfwifi

@@ -11,6 +11,7 @@ menuconfig WIFI_NRF70
 	select NET_L2_ETHERNET_MGMT if NETWORKING && NET_L2_ETHERNET
 	select WIFI_USE_NATIVE_NETWORKING if NETWORKING
 	select EXPERIMENTAL if !SOC_SERIES_NRF53X && !SOC_SERIES_NRF91X
+	select NRF70_BUSLIB
 	default y
 	depends on \
 		DT_HAS_NORDIC_NRF7002_SPI_ENABLED || DT_HAS_NORDIC_NRF7002_QSPI_ENABLED || \
@@ -33,16 +34,9 @@ config WIFI_NRF7000
 	bool
 	default y if DT_HAS_NORDIC_NRF7000_SPI_ENABLED || DT_HAS_NORDIC_NRF7000_QSPI_ENABLED
 
-
-module = WIFI_NRF70_BUS
-module-dep = LOG
-module-str = Log level for Wi-Fi nRF70 bus layers
-module-help = Sets log level for Wi-Fi nRF70 bus layers
-source "subsys/net/Kconfig.template.log_config.net"
-
-config WIFI_NRF70_BUS_LOG_LEVEL
-	# Enable error by default
-	default 1
+config NRF70_QSPI_LOW_POWER
+	bool "low power mode in QSPI"
+	default y if NRF_WIFI_LOW_POWER
 
 choice NRF70_OPER_MODES
 	bool "nRF70 operating modes"