drivers: wifi: esp_at: rename driver from esp

Recently WiFi ESP32 driver (utilizing WiFi radio in ESP32 SoC) was
introduced into drivers/wifi/esp32/ and it already caused confusion as
there was existing drivers/wifi/esp/ directory for ESP-AT
driver (utilizing external WiFi chip, by communicating using AT commands
from any serial capable platform). So question has arisen whether it is
good to merge both, while they are totally different drivers.

Rename ESP-AT driver to be placed in drivers/wifi/esp_at/, so that it is
easier to figure out difference between "esp32" and "esp_at" just by
looking at driver name. Rename also DT compatible and all Kconfig
options for the same reason.

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>

Author: mniestroj

CODEOWNERS

@@ -327,7 +327,7 @@
 /drivers/watchdog/wdt_handlers.c          @dcpleung @nashif
 /drivers/watchdog/*cc32xx*                @pavlohamov
 /drivers/wifi/                            @jukkar @tbursztyka @pfalcon
-/drivers/wifi/esp/                        @mniestroj
+/drivers/wifi/esp_at/                     @mniestroj
 /drivers/wifi/eswifi/                     @loicpoulain @nandojve
 /drivers/wifi/winc1500/                   @kludentwo
 /drivers/virtualization/		  @tbursztyka
@@ -385,7 +385,7 @@
 /dts/bindings/adc/st*stm32-adc.yaml       @cybertale
 /dts/bindings/modem/*hl7800.yaml          @rerickson1
 /dts/bindings/serial/ns16550.yaml         @dcpleung @nashif
-/dts/bindings/wifi/*esp.yaml              @mniestroj
+/dts/bindings/wifi/*esp-at.yaml           @mniestroj
 /dts/bindings/*/*npcx*                    @MulinChao @WealianLiao @ChiHuaL
 /dts/bindings/*/*psoc6*                   @nandojve
 /dts/bindings/*/nordic*                   @anangl

boards/arm/arduino_nano_33_iot/arduino_nano_33_iot.dts

@@ -84,7 +84,7 @@
 	txpo = <0>;
 
 	nina_prog {
-		compatible = "espressif,esp";
+		compatible = "espressif,esp-at";
 		label = "NINA_PROG";
 		reset-gpios = <&porta 8 GPIO_ACTIVE_LOW>;
 	};

boards/shields/esp_8266/Kconfig.defconfig

@@ -7,13 +7,13 @@ if SHIELD_ESP_8266 || \
 
 if NETWORKING
 
-config WIFI_ESP
+config WIFI_ESP_AT
 	default y
 	depends on WIFI
 
 choice WIFI_ESP_AT_VERSION
 	default WIFI_ESP_AT_VERSION_1_7
-	depends on WIFI_ESP
+	depends on WIFI_ESP_AT
 endchoice
 
 orsource "boards/*.defconfig"

boards/shields/esp_8266/boards/sam4e_xpro.overlay

@@ -11,7 +11,7 @@
 	pinctrl-0 = <&pa21a_usart1_rxd1 &pa22a_usart1_txd1>;
 
 	esp8266 {
-		compatible = "espressif,esp";
+		compatible = "espressif,esp-at";
 		label = "esp8266";
 		status = "okay";
 	};

boards/shields/esp_8266/esp_8266_arduino.overlay

@@ -9,7 +9,7 @@
 	current-speed = <115200>;
 
 	esp8266 {
-		compatible = "espressif,esp";
+		compatible = "espressif,esp-at";
 		label = "esp8266";
 		status = "okay";
 	};

boards/shields/esp_8266/esp_8266_mikrobus.overlay

@@ -9,7 +9,7 @@
 	current-speed = <115200>;
 
 	esp8266 {
-		compatible = "espressif,esp";
+		compatible = "espressif,esp-at";
 		label = "esp8266";
 		status = "okay";
 	};

drivers/wifi/CMakeLists.txt

@@ -3,5 +3,5 @@
 add_subdirectory_ifdef(CONFIG_WIFI_WINC1500	winc1500)
 add_subdirectory_ifdef(CONFIG_WIFI_SIMPLELINK	simplelink)
 add_subdirectory_ifdef(CONFIG_WIFI_ESWIFI	eswifi)
-add_subdirectory_ifdef(CONFIG_WIFI_ESP		esp)
+add_subdirectory_ifdef(CONFIG_WIFI_ESP_AT		esp_at)
 add_subdirectory_ifdef(CONFIG_WIFI_ESP32        esp32)

drivers/wifi/Kconfig

@@ -32,7 +32,7 @@ config WIFI_OFFLOAD
 source "drivers/wifi/winc1500/Kconfig.winc1500"
 source "drivers/wifi/simplelink/Kconfig.simplelink"
 source "drivers/wifi/eswifi/Kconfig.eswifi"
-source "drivers/wifi/esp/Kconfig.esp"
+source "drivers/wifi/esp_at/Kconfig.esp_at"
 source "drivers/wifi/esp32/Kconfig.esp32"
 
 endif # WIFI

drivers/wifi/esp/CMakeLists.txt renamed to drivers/wifi/esp_at/CMakeLists.txt

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
-if(CONFIG_WIFI_ESP)
+if(CONFIG_WIFI_ESP_AT)
 
   zephyr_library_include_directories(
     ${ZEPHYR_BASE}/drivers/modem

drivers/wifi/esp/Kconfig.esp renamed to drivers/wifi/esp_at/Kconfig.esp_at

@@ -1,110 +1,114 @@
 # Copyright (c) 2019 Tobias Svehagen
 # SPDX-License-Identifier: Apache-2.0
 
-menuconfig WIFI_ESP
-	bool "Espressif ESP8266 and ESP32 support"
+menuconfig WIFI_ESP_AT
+	bool "Espressif AT Command support"
 	select MODEM
 	select MODEM_CONTEXT
 	select MODEM_CMD_HANDLER
 	select MODEM_IFACE_UART
 	select NET_L2_WIFI_MGMT
 	select WIFI_OFFLOAD
+	help
+	  Enable Espressif AT Command offloaded WiFi driver. It is supported on
+	  any serial capable platform and communicates with Espressif chips
+	  running ESP-AT firmware (https://github.com/espressif/esp-at).
 
-if WIFI_ESP
+if WIFI_ESP_AT
 
-config WIFI_ESP_RX_STACK_SIZE
+config WIFI_ESP_AT_RX_STACK_SIZE
 	int "Stack size for the Espressif esp wifi driver RX thread"
 	default 1024
 	help
 	  This stack is used by the Espressif ESP RX thread.
 
-config WIFI_ESP_RX_THREAD_PRIORITY
+config WIFI_ESP_AT_RX_THREAD_PRIORITY
 	int "Priority of RX thread"
 	default 7
 	help
 	  Priority of thread used for processing RX data.
 
-config WIFI_ESP_WORKQ_STACK_SIZE
+config WIFI_ESP_AT_WORKQ_STACK_SIZE
 	int "Stack size for the esp driver work queue"
 	default 2048
 	help
 	  This stack is used by the work queue to pass off net_pkt data
 	  to the rest of the network stack, letting the rx thread continue
 	  processing data.
 
-config WIFI_ESP_WORKQ_THREAD_PRIORITY
+config WIFI_ESP_AT_WORKQ_THREAD_PRIORITY
 	int "Priority of work queue thread"
 	default 7
 	help
 	  Priority of thread used for processing driver work queue items.
 
-config WIFI_ESP_MDM_RING_BUF_SIZE
+config WIFI_ESP_AT_MDM_RING_BUF_SIZE
 	int "Modem ring buffer size"
 	default 1024
 	help
 	  Ring buffer size used by modem UART interface handler.
 
-config WIFI_ESP_MDM_RX_BUF_COUNT
+config WIFI_ESP_AT_MDM_RX_BUF_COUNT
 	int "Modem RX buffer count"
 	default 30
 	help
 	  Number of preallocated RX buffers used by modem command handler.
 
-config WIFI_ESP_MDM_RX_BUF_SIZE
+config WIFI_ESP_AT_MDM_RX_BUF_SIZE
 	int "Modem RX buffer size"
 	default 128
 	help
 	  Size of preallocated RX buffers used by modem command handler.
 
-config WIFI_ESP_PASSIVE_MODE
+config WIFI_ESP_AT_PASSIVE_MODE
 	bool "Use passive mode"
 	help
 	  This lets the ESP handle the TCP window so that data can flow
 	  at a rate that the driver can handle. Without this, data might get
 	  lost if the driver cannot empty the device buffer quickly enough.
 
-config WIFI_ESP_RESET_TIMEOUT
+config WIFI_ESP_AT_RESET_TIMEOUT
 	int "Reset timeout"
 	default 3000
 	help
 	  How long to wait for device to become ready after AT+RST has been
 	  sent. This can vary with chipset (ESP8266/ESP32) and firmware
 	  version. This is ignored if a reset pin is configured.
 
-config WIFI_ESP_RX_NET_PKT_ALLOC_TIMEOUT
+config WIFI_ESP_AT_RX_NET_PKT_ALLOC_TIMEOUT
 	int "Network interface RX packet allocation timeout"
 	default 5000
 	help
 	  Network interface RX net_pkt allocation timeout in milliseconds.
 
 choice
 	prompt "ESP IP Address configuration"
-	default WIFI_ESP_IP_DHCP
+	default WIFI_ESP_AT_IP_DHCP
 	help
 	  Choose whether to use an IP assigned by DHCP Server or
 	  configure a static IP Address.
 
-config WIFI_ESP_IP_DHCP
+config WIFI_ESP_AT_IP_DHCP
 	bool "DHCP"
 	help
 	  Use DHCP to get an IP Address.
 
-config WIFI_ESP_IP_STATIC
+config WIFI_ESP_AT_IP_STATIC
 	bool "Static"
 	help
 	  Setup Static IP Address.
 
 endchoice
 
-if WIFI_ESP_IP_STATIC
+if WIFI_ESP_AT_IP_STATIC
 
-config WIFI_ESP_IP_ADDRESS
+config WIFI_ESP_AT_IP_ADDRESS
 	string "ESP Station mode IP Address"
 
-config WIFI_ESP_IP_GATEWAY
+config WIFI_ESP_AT_IP_GATEWAY
 	string "Gateway Address"
 
-config WIFI_ESP_IP_MASK
+config WIFI_ESP_AT_IP_MASK
 	string "Network Mask"
 
 endif
@@ -127,11 +131,11 @@ config WIFI_ESP_AT_VERSION_2_0
 
 endchoice
 
-config WIFI_ESP_DNS_USE
+config WIFI_ESP_AT_DNS_USE
 	bool "Use DNS from ESP"
 	depends on DNS_RESOLVER
 	help
 	  Fetch DNS servers from ESP chip with AT+CIPDNS? command and apply that
 	  list to system DNS resolver.
 
-endif # WIFI_ESP
+endif # WIFI_ESP_AT