drivers: comparator: add it51xxx_evb analog comparator driver

Add analog comparator driver for ITE it51xxx chip.

Signed-off-by: Yunshao Chiang <[email protected]>

Author: Yunshao-Chiang

boards/ite/it515xx_evb/it515xx_evb.dts

@@ -153,3 +153,11 @@
 &sha256 {
 	status = "okay";
 };
+
+/* voltage comparator for test */
+&vcmp1 {
+	status = "okay";
+	threshold-mv = <1500>;
+	scan-period = <0x4>;
+	io-channels = <&adc0 3>;
+};

drivers/comparator/CMakeLists.txt

@@ -8,6 +8,7 @@ zephyr_library()
 zephyr_library_sources_ifdef(CONFIG_USERSPACE comparator_handlers.c)
 zephyr_library_sources_ifdef(CONFIG_COMPARATOR_SILABS_ACMP comparator_silabs_acmp.c)
 zephyr_library_sources_ifdef(CONFIG_COMPARATOR_FAKE_COMP comparator_fake_comp.c)
+zephyr_library_sources_ifdef(CONFIG_COMPARATOR_IT51XXX_VCMP comparator_it51xxx_vcmp.c)
 zephyr_library_sources_ifdef(CONFIG_COMPARATOR_MCUX_ACMP comparator_mcux_acmp.c)
 zephyr_library_sources_ifdef(CONFIG_COMPARATOR_NRF_COMP comparator_nrf_comp.c)
 zephyr_library_sources_ifdef(CONFIG_COMPARATOR_NRF_LPCOMP comparator_nrf_lpcomp.c)

drivers/comparator/Kconfig

@@ -20,6 +20,7 @@ config COMPARATOR_INIT_PRIORITY
 
 rsource "Kconfig.fake_comp"
 rsource "Kconfig.silabs_acmp"
+rsource "Kconfig.it51xxx_vcmp"
 rsource "Kconfig.mcux_acmp"
 rsource "Kconfig.nrf_comp"
 rsource "Kconfig.nrf_lpcomp"

drivers/comparator/Kconfig.it51xxx_vcmp

@@ -0,0 +1,15 @@
+# ITE Voltage Comparator driver configuration options
+
+# Copyright (c) 2025 ITE Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+config COMPARATOR_IT51XXX_VCMP
+	bool "ITE it51xxx Voltage Comparator"
+	default y
+	depends on ADC_ITE_IT51XXX
+	depends on DT_HAS_ITE_IT51XXX_VCMP_ENABLED
+	depends on DYNAMIC_INTERRUPTS
+	help
+	  This option enables the ITE it51xxx voltage comparator,
+	  it51xxx supports three 10-bit threshold voltage comparator
+	  channels, and the input of each comparator comes from ADC pin.