drivers: adc: add adc support in npcm4 series

NPCM4 includes a 10-bit resolution Analog-to-Digital Converter (ADC). Up to 14 voltage inputs can be measured and an internal voltage reference (VREF), 2.048V (typical) is used for measurement. Each input channel is assigned a separate result register, which is updated at the end of the conversion. The CL also includes: — Add npcm adc device tree declarations. — Zephyr adc api implementation. Signed-off-by: Tyrone Ting <[email protected]>
Nuvoton-Israel · Jun 18, 2024 · ee863c8 · ee863c8
1 parent 0db0527
commit ee863c8
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diff --git a/boards/nuvoton/npcm400f_evb/npcm400f_evb.dts b/boards/nuvoton/npcm400f_evb/npcm400f_evb.dts
@@ -22,6 +22,19 @@
 	aliases {
 		watchdog0 = &twd0;
 	};
+
+	zephyr,user {
+		/* adjust channel number according to enum adc_channel_en in adc_npcm.c */
+		/* Because VIN16, THR16, TD2P is the same pin, it must only select one type.
+		 * Because VIN15, THR15, TD0P is the same pin, it must only select one type.
+		 * Because VIN14, THR14, TD1P is the same pin, it must only select one type.
+		 * Because VIN1, THR1, TD3P is the same pin, it must only select one type.
+		 * Because VIN2, THR2, TD4P is the same pin, it must only select one type.
+		 * Exsample : if you select channel 6(VIN16),
+		 *            and you can't select channel 7(THR16) and channel 19(TD2P).
+		 */
+		io-channels = <&adc0 17>, <&adc0 18>;
+	};
 };
 
 &uart0 {
@@ -37,3 +50,22 @@
 	pinctrl-0 = <&cr_uart2_sin_gp30 &cr_uart2_sout_gp31>;
 	pinctrl-names = "default";
 };
+
+&adc0 {
+	status = "okay";
+	/* Pin D7 is shared by thermal signal VIN16, THR16, TD2P.
+	 * Pin C7 is shared by thermal signal VIN15, THR15, TD1P.
+	 * Pin A6 is shared by thermal signal VIN14, THR14, TD0P.
+	 * Pin B6 is shared by thermal signal VIN1, THR1, TD3P.
+	 * Pin C6 is shared by thermal signal VIN2, THR2, TD4P.
+	 */
+	pinctrl-0 = <&adc_vin7_gp86   /* VIN7 - C8 */
+		     &adc_vin5_gp87   /* VIN5 - F7 */
+		     &adc_vin16_gp91  /* VIN16/THR16/TD2P - D7 */
+		     &adc_vin15_gp91  /* VIN15/THR15/TD1P - C7 */
+		     &adc_vin14_gp92  /* VIN14/THR14/TD0P - A6 */
+		     &adc_vin1_gp93   /* VIN1/THR1/TD3P - B6 */
+		     &adc_vin2_gp94   /* VIN2/THR2/TD4P - C6 */
+		     &adc_vin3_gp95>; /* VIN3 - D6 */
+	pinctrl-names = "default";
+};
diff --git a/boards/nuvoton/npcm400f_evb/npcm400f_evb_defconfig b/boards/nuvoton/npcm400f_evb/npcm400f_evb_defconfig
@@ -40,3 +40,7 @@ CONFIG_NPCM_MIWU=y
 # Watchdog Driver
 CONFIG_WATCHDOG=y
 CONFIG_WDT_NPCM=y
+
+# ADC Driver
+CONFIG_ADC=y
+CONFIG_ADC_NPCM=y
diff --git a/drivers/adc/CMakeLists.txt b/drivers/adc/CMakeLists.txt
@@ -51,3 +51,4 @@ zephyr_library_sources_ifdef(CONFIG_ADC_LTC2451 adc_ltc2451.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_NUMAKER         adc_numaker.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_ENE_KB1200	adc_ene_kb1200.c)
 zephyr_library_sources_ifdef(CONFIG_ADC_MCUX_GAU	adc_mcux_gau_adc.c)
+zephyr_library_sources_ifdef(CONFIG_ADC_NPCM		adc_npcm.c)
diff --git a/drivers/adc/Kconfig b/drivers/adc/Kconfig
@@ -128,4 +128,6 @@ source "drivers/adc/Kconfig.numaker"
 
 source "drivers/adc/Kconfig.ene"
 
+source "drivers/adc/Kconfig.npcm"
+
 endif # ADC
diff --git a/drivers/adc/Kconfig.npcm b/drivers/adc/Kconfig.npcm
@@ -0,0 +1,13 @@
+# NPCM ADC driver configuration options
+
+# Copyright (c) 2024 Nuvoton Technology Corporation.
+# SPDX-License-Identifier: Apache-2.0
+
+config ADC_NPCM
+	bool "Nuvoton NPCM ADC driver"
+	default y
+	depends on DT_HAS_NUVOTON_NPCM_ADC_ENABLED
+	help
+	  This option enables the ADC driver for NPCM family of
+	  processors.
+	  Say y if you wish to use ADC channels on NPCM MCU.