wifi: esp32s2: add driver support

add support for esp32s2 wifi.

Signed-off-by: Glauber Maroto Ferreira <glauber.ferreira@espressif.com>

dts/xtensa/espressif/esp32s2.dtsi

@@ -25,6 +25,11 @@
 		};
 	};
 
+	wifi: wifi {
+		compatible = "espressif,esp32-wifi";
+		status = "disabled";
+	};
+
 	soc {
 		#address-cells = <1>;
 		#size-cells = <1>;

soc/xtensa/esp32s2/Kconfig.soc

@@ -69,4 +69,44 @@ config ESP32S2_DATA_CACHE_SIZE
 	default 0x2000 if ESP32S2_DATA_CACHE_8KB
 	default 0x4000 if ESP32S2_DATA_CACHE_16KB
 
-endif
+choice ESP32S2_UNIVERSAL_MAC_ADDRESSES
+	bool "Number of universally administered (by IEEE) MAC address"
+	default ESP32S2_UNIVERSAL_MAC_ADDRESSES_TWO
+	help
+	  Configure the number of universally administered (by IEEE) MAC addresses.
+	  During initialization, MAC addresses for each network interface are generated or
+	  derived from a single base MAC address. If the number of universal MAC addresses is two,
+	  all interfaces (WiFi station, WiFi softap) receive a universally administered MAC
+	  address.
+	  They are generated sequentially by adding 0, and 1 (respectively) to the final octet of
+	  the base MAC address. If the number of universal MAC addresses is one, only WiFi station
+	  receives a universally administered MAC address.
+	  The WiFi softap receives local MAC addresses. It's derived from the universal WiFi
+	  station MAC addresses.
+	  When using the default (Espressif-assigned) base MAC address, either setting can be used.
+	  When using a custom universal MAC address range, the correct setting will depend on the
+	  allocation of MAC addresses in this range (either 1 or 2 per device).
+
+	config ESP32S2_UNIVERSAL_MAC_ADDRESSES_ONE
+		bool "Two"
+		select ESP_MAC_ADDR_UNIVERSE_WIFI_STA
+
+	config ESP32S2_UNIVERSAL_MAC_ADDRESSES_TWO
+		bool "Two"
+		select ESP_MAC_ADDR_UNIVERSE_WIFI_STA
+		select ESP_MAC_ADDR_UNIVERSE_WIFI_AP
+
+endchoice
+
+config ESP_MAC_ADDR_UNIVERSE_WIFI_AP
+	bool
+
+config ESP_MAC_ADDR_UNIVERSE_WIFI_STA
+	bool
+
+config ESP32S2_UNIVERSAL_MAC_ADDRESSES
+	int
+	default 1 if ESP32S2_UNIVERSAL_MAC_ADDRESSES_ONE
+	default 2 if ESP32S2_UNIVERSAL_MAC_ADDRESSES_TWO
+
+endif # SOC_ESP32S2

soc/xtensa/esp32s2/linker.ld

@@ -323,6 +323,17 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
     *libzephyr.a:log_backend_uart.*(.literal .text .literal.* .text.*)
     *liblib__libc__minimal.a:string.*(.literal .text .literal.* .text.*)
     *libgcov.a:(.literal .text .literal.* .text.*)
+
+#if defined(CONFIG_ESP32_WIFI_IRAM_OPT)
+    *libnet80211.a:( .wifi0iram  .wifi0iram.* .wifislpiram .wifislpiram.*)
+    *libpp.a:( .wifi0iram  .wifi0iram.* .wifislpiram .wifislpiram.*)
+#endif
+
+#if defined(CONFIG_ESP32_WIFI_RX_IRAM_OPT)
+    *libnet80211.a:( .wifirxiram  .wifirxiram.* .wifislprxiram .wifislprxiram.*)
+    *libpp.a:( .wifirxiram  .wifirxiram.* .wifislprxiram .wifislprxiram.*)
+#endif
+
     _iram_text_end = ABSOLUTE(.);
     . = ALIGN(4);
     _iram_end = ABSOLUTE(.);
@@ -332,6 +343,17 @@ __shell_root_cmds_end = __esp_shell_root_cmds_end;
   {
     _stext = .;
     _text_start = ABSOLUTE(.);
+
+#if !defined(CONFIG_ESP32_WIFI_IRAM_OPT)
+    *libnet80211.a:( .wifi0iram  .wifi0iram.* .wifislpiram .wifislpiram.*)
+    *libpp.a:( .wifi0iram  .wifi0iram.* .wifislpiram .wifislpiram.*)
+#endif
+
+#if !defined(CONFIG_ESP32_WIFI_RX_IRAM_OPT)
+    *libnet80211.a:( .wifirxiram  .wifirxiram.* .wifislprxiram .wifislprxiram.*)
+    *libpp.a:( .wifirxiram  .wifirxiram.* .wifislprxiram .wifislprxiram.*)
+#endif
+
     *(.literal .text .literal.* .text.*)
     _text_end = ABSOLUTE(.);
     _etext = .;