[nrf fromtree] drivers: nrfwifi: Add provision to handle FW blobs ext…

…ernally

The FW blobs are contentious topic in OSS, so, add a provision to use
external tooling (e.g., NCS) to handle FW blobs for advanced usecases
(e.g., storing in external flash).

This won't be used upstream, only built-in or build-only are supported.

Signed-off-by: Chaitanya Tata <[email protected]>
(cherry picked from commit cb1ea80)

drivers/wifi/nrfwifi/CMakeLists.txt

@@ -142,7 +142,7 @@ if (CONFIG_NRF_WIFI_BUILD_ONLY_MODE)
   This is only for building (CI) purposes and will not work on a real device.
   ------------------------------------------------------------------------
   ")
-else()
+elseif(CONFIG_NRF_WIFI_PATCHES_BUILTIN)
   # RPU FW patch binaries based on the selected configuration
   if(CONFIG_NRF70_SYSTEM_MODE)
     set(NRF70_PATCH ${FW_BINS_BASE}/default/nrf70.bin)

drivers/wifi/nrfwifi/Kconfig.nrfwifi

@@ -128,14 +128,29 @@ config NRF_WIFI_IF_AUTO_START
 	bool "Wi-Fi interface auto start on boot"
 	default y
 
+choice NRF_WIFI_FW_BLOB_HANDLING
+	prompt "nRF70 Firmware blob handling"
+	default NRF_WIFI_PATCHES_BUILTIN
+
+config NRF_WIFI_BUILD_ONLY_MODE
+	bool "Build only mode"
+	help
+	  Enable this option to build the driver without firmware loading, removes
+	  dependency on firmware binary and patches.
+	  This is useful to check the build and link errors.
+
 config NRF_WIFI_PATCHES_BUILTIN
 	bool "Store nRF70 FW patches as part of the driver"
-	default y
-	depends on !NRF_WIFI_BUILD_ONLY_MODE
 	help
 	  Select this option to store nRF70 FW patches as part of the driver.
 	  This option impacts the code memory footprint of the driver.
 
+config NRF_WIFI_PATCHES_EXTERNAL
+	bool "Load nRF70 FW patches from external binary"
+	help
+	  Select this option to load nRF70 FW patches from an external tooling.
+endchoice
+
 config NRF_WIFI_LOW_POWER
 	bool "low power mode in nRF Wi-Fi chipsets"
 	default y
@@ -690,11 +705,4 @@ config NRF_WIFI_QOS_NULL_BASED_RETRIEVAL
 
 endchoice
 
-config NRF_WIFI_BUILD_ONLY_MODE
-	bool "Build only mode"
-	help
-	  Enable this option to build the driver without firmware loading, removes
-	  dependency on firmware binary and patches.
-	  This is useful to check the build and link errors.
-
 endif # WIFI_NRF70