drivers: adc: add it515xx_evb board adc driver

Add it515xx analog to digital converter driver which supports 8 channels
ch0 ~ ch7 and 12-bit resolution.

Signed-off-by: Yunshao Chiang <Yunshao.Chiang@ite.com.tw>

Author: Yunshao-Chiang

boards/ite/it515xx_evb/it515xx_evb.dts

@@ -104,3 +104,9 @@
 	row-size = <8>;
 	col-size = <16>;
 };
+
+&adc0 {
+	status = "okay";
+	pinctrl-0 = <&adc0_ch3_gpi3_default>;
+	pinctrl-names = "default";
+};

drivers/adc/CMakeLists.txt

@@ -6,6 +6,7 @@ zephyr_library()
 
 zephyr_library_sources_ifdef(CONFIG_ADC			adc_common.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_TELINK_B91	adc_b91.c)
+zephyr_library_sources_ifdef(CONFIG_ADC_ITE_IT51XXX	adc_ite_it51xxx.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_ITE_IT8XXX2	adc_ite_it8xxx2.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_SHELL		adc_shell.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_MCUX_ADC12	adc_mcux_adc12.c)

drivers/adc/Kconfig

@@ -56,6 +56,8 @@ source "subsys/logging/Kconfig.template.log_config"
 
 source "drivers/adc/Kconfig.b91"
 
+source "drivers/adc/Kconfig.it51xxx"
+
 source "drivers/adc/Kconfig.it8xxx2"
 
 source "drivers/adc/Kconfig.mcux"

drivers/adc/Kconfig.it51xxx

@@ -0,0 +1,27 @@
+# ADC configuration options
+
+# Copyright (c) 2025 ITE Corporation. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+config ADC_ITE_IT51XXX
+	bool "ITE IT51XXX ADC driver"
+	default y
+	depends on DT_HAS_ITE_IT51XXX_ADC_ENABLED
+	select PINCTRL
+	help
+	  This option enables the ADC driver for IT51XXX
+	  family of processors.
+	  Voltage range 0 to 3300mV.
+	  Support 12-bit resolution.
+	  Support 8 channels: ch0~ch7.
+
+if ADC_ITE_IT51XXX
+
+config ADC_IT51XXX_VOL_FULL_SCALE
+	bool "ADC internal voltage as full-scale"
+	default y
+	help
+	  This option enables ADC internal reference
+	  voltage as full-scale 3300mV.
+
+endif # ADC_ITE_IT51XXX