Add silabs series 2 IADC driver with scan conversion and DMA support.

boards/silabs/radio_boards/slwrb4180a/slwrb4180a-pinctrl.dtsi

@@ -21,4 +21,10 @@
 			silabs,input-filter;
 		};
 	};
+
+	iadc0_default: iadc0_default {
+		group0 {
+			silabs,analog-bus = <ABUS_AEVEN0_IADC0>;
+		};
+	};
 };

boards/silabs/radio_boards/slwrb4180a/slwrb4180a.dts

@@ -6,6 +6,7 @@
 
 /dts-v1/;
 #include <silabs/xg21/efr32mg21a020f1024im32.dtsi>
+#include <dt-bindings/adc/silabs-adc.h>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
 #include "slwrb4180a-pinctrl.dtsi"
 
@@ -30,6 +31,7 @@
 		sw0 = &button0;
 		sw1 = &button1;
 		watchdog0 = &wdog0;
+		adc0 = &adc0;
 	};
 
 	leds {
@@ -64,6 +66,37 @@
 		};
 	};
 
+	joystick {
+		compatible = "adc-keys";
+		io-channels = <&adc0 0>;
+		keyup-threshold-mv = <3300>;
+
+		select-key {
+			press-thresholds-mv = <33>;
+			zephyr,code = <INPUT_KEY_ENTER>;
+		};
+
+		left-key {
+			press-thresholds-mv = <1980>;
+			zephyr,code = <INPUT_KEY_LEFT>;
+		};
+
+		down-key {
+			press-thresholds-mv = <1650>;
+			zephyr,code = <INPUT_KEY_DOWN>;
+		};
+
+		up-key {
+			press-thresholds-mv = <2831>;
+			zephyr,code = <INPUT_KEY_UP>;
+		};
+
+		right-key {
+			press-thresholds-mv = <2533>;
+			zephyr,code = <INPUT_KEY_RIGHT>;
+		};
+	};
+
 	exp_header: exp-header {
 		compatible = "silabs,exp-header";
 		#gpio-cells = <2>;
@@ -80,6 +113,10 @@
 		gpio-map-mask = <0xffffffff 0x0>;
 		gpio-map-pass-thru = <0x0 GPIO_DT_FLAGS_MASK>;
 	};
+
+	zephyr,user {
+		io-channels = <&adc0 0>;
+	};
 };
 
 &cpu0 {
@@ -128,6 +165,24 @@
 	clocks = <&lfxo>;
 };
 
+&adc0 {
+	pinctrl-0 = <&iadc0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@0 {
+		reg = <0>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,input-positive = <IADC_INPUT_PA0>;
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,resolution = <12>;
+		zephyr,vref-mv = <3300>;
+	};
+};
+
 &usart0 {
 	current-speed = <115200>;
 	pinctrl-0 = <&usart0_default>;

boards/silabs/radio_boards/slwrb4180b/slwrb4180b-pinctrl.dtsi

@@ -20,4 +20,10 @@
 			silabs,input-filter;
 		};
 	};
+
+	iadc0_default: iadc0_default {
+		group0 {
+			silabs,analog-bus = <ABUS_AEVEN0_IADC0>;
+		};
+	};
 };

boards/silabs/radio_boards/slwrb4180b/slwrb4180b.dts

@@ -7,6 +7,7 @@
 
 /dts-v1/;
 #include <silabs/xg21/efr32mg21a020f1024im32.dtsi>
+#include <dt-bindings/adc/silabs-adc.h>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
 #include "slwrb4180b-pinctrl.dtsi"
 
@@ -30,6 +31,7 @@
 		sw0 = &button0;
 		sw1 = &button1;
 		watchdog0 = &wdog0;
+		adc0 = &adc0;
 	};
 
 	leds {
@@ -62,6 +64,37 @@
 		};
 	};
 
+	joystick {
+		compatible = "adc-keys";
+		io-channels = <&adc0 0>;
+		keyup-threshold-mv = <3300>;
+
+		select-key {
+			press-thresholds-mv = <33>;
+			zephyr,code = <INPUT_KEY_ENTER>;
+		};
+
+		left-key {
+			press-thresholds-mv = <1980>;
+			zephyr,code = <INPUT_KEY_LEFT>;
+		};
+
+		down-key {
+			press-thresholds-mv = <1650>;
+			zephyr,code = <INPUT_KEY_DOWN>;
+		};
+
+		up-key {
+			press-thresholds-mv = <2831>;
+			zephyr,code = <INPUT_KEY_UP>;
+		};
+
+		right-key {
+			press-thresholds-mv = <2533>;
+			zephyr,code = <INPUT_KEY_RIGHT>;
+		};
+	};
+
 	exp_header: exp-header {
 		compatible = "silabs,exp-header";
 		#gpio-cells = <2>;
@@ -78,6 +111,10 @@
 		gpio-map-mask = <0xffffffff 0x0>;
 		gpio-map-pass-thru = <0x0 GPIO_DT_FLAGS_MASK>;
 	};
+
+	zephyr,user {
+		io-channels = <&adc0 0>;
+	};
 };
 
 &cpu0 {
@@ -126,6 +163,24 @@
 	clocks = <&lfxo>;
 };
 
+&adc0 {
+	pinctrl-0 = <&iadc0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@0 {
+		reg = <0>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,input-positive = <IADC_INPUT_PA0>;
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,resolution = <12>;
+		zephyr,vref-mv = <3300>;
+	};
+};
+
 &usart0 {
 	current-speed = <115200>;
 	pinctrl-0 = <&usart0_default>;

boards/silabs/radio_boards/xg27/xg27_rb4194a.dts

@@ -36,6 +36,7 @@
 		sw1 = &button1;
 		watchdog0 = &wdog0;
 		dht0 = &si7021;
+		adc0 = &adc0;
 	};
 
 	leds {

boards/silabs/radio_boards/xg29_rb4412a/xg29_rb4412a-pinctrl.dtsi

@@ -21,6 +21,12 @@
 		};
 	};
 
+	iadc0_default: iadc0_default {
+		group0 {
+			silabs,analog-bus = <ABUS_CDODD0_IADC0>;
+		};
+	};
+
 	itm_default: itm_default {
 		group0 {
 			pins = <GPIO_SWV_PA3>;

boards/silabs/radio_boards/xg29_rb4412a/xg29_rb4412a.dts

@@ -6,6 +6,7 @@
 
 /dts-v1/;
 #include <silabs/xg29/efr32mg29b140f1024im40.dtsi>
+#include <dt-bindings/adc/silabs-adc.h>
 #include <zephyr/dt-bindings/input/input-event-codes.h>
 #include <zephyr/dt-bindings/pwm/pwm.h>
 #include <zephyr/dt-bindings/regulator/silabs_dcdc.h>
@@ -35,6 +36,7 @@
 		sw1 = &button1;
 		watchdog0 = &wdog0;
 		dht0 = &si7021;
+		adc0 = &adc0;
 	};
 
 	leds {
@@ -75,6 +77,37 @@
 		};
 	};
 
+	joystick {
+		compatible = "adc-keys";
+		io-channels = <&adc0 0>;
+		keyup-threshold-mv = <3300>;
+
+		select-key {
+			press-thresholds-mv = <33>;
+			zephyr,code = <INPUT_KEY_ENTER>;
+		};
+
+		left-key {
+			press-thresholds-mv = <1980>;
+			zephyr,code = <INPUT_KEY_LEFT>;
+		};
+
+		down-key {
+			press-thresholds-mv = <1650>;
+			zephyr,code = <INPUT_KEY_DOWN>;
+		};
+
+		up-key {
+			press-thresholds-mv = <2831>;
+			zephyr,code = <INPUT_KEY_UP>;
+		};
+
+		right-key {
+			press-thresholds-mv = <2533>;
+			zephyr,code = <INPUT_KEY_RIGHT>;
+		};
+	};
+
 	display_enable: sensor_enable: gpio_switch_0 {
 		compatible = "regulator-fixed";
 		enable-gpios = <&gpioc 7 GPIO_ACTIVE_HIGH>;
@@ -98,6 +131,10 @@
 		gpio-map-mask = <0xffffffff 0x0>;
 		gpio-map-pass-thru = <0x0 GPIO_DT_FLAGS_MASK>;
 	};
+
+	zephyr,user {
+		io-channels = <&adc0 0>;
+	};
 };
 
 &cpu0 {
@@ -210,6 +247,24 @@
 	};
 };
 
+&adc0 {
+	pinctrl-0 = <&iadc0_default>;
+	pinctrl-names = "default";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	channel@0 {
+		reg = <0>;
+		zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
+		zephyr,gain = "ADC_GAIN_1";
+		zephyr,input-positive = <IADC_INPUT_PD3>;
+		zephyr,reference = "ADC_REF_VDD_1";
+		zephyr,resolution = <12>;
+		zephyr,vref-mv = <3300>;
+	};
+};
+
 &gpio {
 	status = "okay";
 };

doc/releases/migration-guide-4.3.rst

@@ -58,6 +58,11 @@ Device Drivers and Devicetree
 
 .. zephyr-keep-sorted-start re(^\w)
 
+ADC
+===
+
+* :dtcompatible:`silabs,gecko-iadc` has been replaced by :dtcompatible:`silabs,iadc`.
+
 MFD
 ===
 

drivers/adc/CMakeLists.txt

@@ -45,6 +45,7 @@ zephyr_library_sources_ifdef(CONFIG_ADC_XMC4XXX		adc_xmc4xxx.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_ESP32		adc_esp32.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_GECKO_ADC   	adc_gecko.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_GECKO_IADC   	iadc_gecko.c)
+zephyr_library_sources_ifdef(CONFIG_ADC_SILABS_IADC   	adc_silabs_iadc.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_SILABS_SIWX91X 	adc_silabs_siwx91x.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_INFINEON_CAT1	adc_ifx_cat1.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_SMARTBOND_GPADC adc_smartbond_gpadc.c)

drivers/adc/Kconfig

@@ -136,6 +136,8 @@ source "drivers/adc/Kconfig.gecko"
 
 source "drivers/adc/Kconfig.siwx91x"
 
+source "drivers/adc/Kconfig.silabs"
+
 source "drivers/adc/Kconfig.ifx_cat1"
 
 source "drivers/adc/Kconfig.smartbond"

drivers/adc/Kconfig.silabs

@@ -0,0 +1,20 @@
+# Copyright (c) 2025 Silicon Laboratories Inc.
+# SPDX-License-Identifier: Apache-2.0
+
+config ADC_SILABS_IADC
+	bool "Silabs Incremental ADC driver"
+	default y
+	depends on DT_HAS_SILABS_IADC_ENABLED
+	select SILABS_SISDK_IADC
+	select ADC_CONFIGURABLE_INPUTS
+	help
+	  Enable the driver implementation for Silabs Incremental ADC
+
+config ADC_SILABS_IADC_DMA
+	bool "Silabs IADC async DMA support"
+	depends on ADC_SILABS_IADC
+	depends on DMA
+	help
+	  Enable DMA support with the Silabs IADC driver.
+	  This allows ADC conversions to be performed (asynchronously or not)
+	  using DMA for improved performance.