drivers: adc: Add Gecko ADC driver

This adds an ADC driver for SiLabs Pearl Gecko MCU

Signed-off-by: Kim Mansfield <[email protected]>

Author: kimmansfield

boards/arm/tmo_dev_edge/board.h

@@ -44,10 +44,4 @@
 #define LED_PWM_GREEN 2
 #define LED_PWM_BLUE  3
 
-#define HWID_APORT		   adcPosSelAPORT4XCH23
-#define VBAT_APORT		   adcPosSelAPORT3XCH10
-
-#define VBAT_EN_PORT       gpioPortK
-#define VBAT_EN_PIN        0
-
 #endif /* __INC_BOARD_H */

boards/arm/tmo_dev_edge/tmo_dev_edge-pinctrl.dtsi

@@ -62,4 +62,12 @@
 					<GECKO_LOC(LEUART_TX, 6)>;
 		};
 	};
+
+	adc_default: adc_default {
+		group1 {
+			psels = <GECKO_ADC_VBATT>,
+				 <GECKO_ADC_HWID>;
+			//input-enabled;
+		};
+	};
 };

boards/arm/tmo_dev_edge/tmo_dev_edge.dts

@@ -1,4 +1,4 @@
-/*
+/*
  * Copyright (c) 2017 Christian Taedcke
  * Copyright (c) 2019 Lemonbeat GmbH
  * Copyright (c) 2023 T-Mobile USA, Inc.
@@ -102,6 +102,21 @@
 		regulator-name = "bq24250rge";
 		regulator-boot-on;
 	};
+
+	adc:adc@40002000 {
+		compatible = "silabs,gecko-adc";
+		status = "disabled";
+		reg = <0x40002000 0x400>;
+		frequency= <16000000>;
+		#io-channel-cells = <1>;
+		vref-mv = <2500>;
+	};
+};
+
+&adc {
+	status = "okay";
+	pinctrl-0 = <&adc_default>;
+	pinctrl-names = "default";
 };
 
 &cpu0 {

boards/arm/tmo_dev_edge/tmo_dev_edge.yaml

@@ -15,6 +15,8 @@ supported:
   - nvs
   - watchdog
   - counter
+  - adc
+
 testing:
   default: true
   ignore_tags:

boards/arm/tmo_dev_edge/tmo_dev_edge_defconfig

@@ -18,6 +18,7 @@ CONFIG_COUNTER=y
 CONFIG_PWM=y
 CONFIG_PWM_GECKO=y
 CONFIG_NOTIFY=y
+CONFIG_ADC=y
 CONFIG_PERSISTENT_GECKO_RTCC=y
 CONFIG_PINCTRL=y
 CONFIG_POSIX_CLOCK=y

drivers/adc/CMakeLists.txt

@@ -32,3 +32,4 @@ zephyr_library_sources_ifdef(CONFIG_ADC_ADS7052		adc_ads7052.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_RPI_PICO	adc_rpi_pico.c)
 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_gecko.c)

drivers/adc/Kconfig

@@ -92,4 +92,5 @@ source "drivers/adc/Kconfig.rpi_pico"
 
 source "drivers/adc/Kconfig.xmc4xxx"
 
+source "drivers/adc/Kconfig.gecko"
 endif # ADC