boards: mimxrt1024_evk: Add ADC support to RT1024

Adds ADC support to RT1024 EVK. ADC channels 10 and 11 are enabled as
pins 2 and 4 on J18 of the evaluation board

Signed-off-by: Daniel DeGrasse <[email protected]>

Author: danieldegrasse

boards/arm/mimxrt1024_evk/doc/index.rst

@@ -97,6 +97,8 @@ features:
 +-----------+------------+-------------------------------------+
 | DMA       | on-chip    | dma                                 |
 +-----------+------------+-------------------------------------+
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 ``boards/arm/mimxrt1024_evk/mimxrt1024_evk_defconfig``
@@ -151,6 +153,10 @@ The MIMXRT1024 SoC has five pairs of pinmux/gpio controllers.
 +---------------+-----------------+---------------------------+
 | GPIO_SD_B1_03 | LPI2C4_SDA      | I2C SDA                   |
 +---------------+-----------------+---------------------------+
+| GPIO_AD_B1_11 | ADC1            | ADC1 Channel 11           |
++---------------+-----------------+---------------------------+
+| GPIO_AD_B1_10 | ADC1            | ADC1 Channel 10           |
++---------------+-----------------+---------------------------+
 
 System Clock
 ============

boards/arm/mimxrt1024_evk/mimxrt1024_evk.dts

@@ -120,3 +120,7 @@
 &lpspi1 {
 	status = "okay";
 };
+
+&adc1 {
+	status = "okay";
+};

boards/arm/mimxrt1024_evk/mimxrt1024_evk.yaml

@@ -21,3 +21,4 @@ supported:
   - netif:eth
   - watchdog
   - spi
+  - adc

boards/arm/mimxrt1024_evk/pinmux.c

@@ -147,6 +147,22 @@ static int mimxrt1024_evk_init(const struct device *dev)
 			IOMUXC_SW_PAD_CTL_PAD_SPEED(2) |
 			IOMUXC_SW_PAD_CTL_PAD_DSE(6));
 #endif
+#endif
+
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(adc1), okay) && CONFIG_ADC
+	/* ADC1 Channel 10 and 11 are on pins 2 and 4 of J18 */
+	/* ADC1 Channel 10 */
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_10_GPIO1_IO26, 0U);
+	/* ADC1 Channel 11 */
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_11_GPIO1_IO27, 0U);
+
+	IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_10_GPIO1_IO26,
+			IOMUXC_SW_PAD_CTL_PAD_SPEED(2) |
+			IOMUXC_SW_PAD_CTL_PAD_DSE(6));
+	IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_11_GPIO1_IO27,
+			IOMUXC_SW_PAD_CTL_PAD_SPEED(2) |
+			IOMUXC_SW_PAD_CTL_PAD_DSE(6));
+
 #endif
 
 	return 0;

samples/drivers/adc/boards/mimxrt1024_evk.overlay

@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2021 NXP
+ */
+
+/ {
+	zephyr,user {
+		/* adjust channel number according to pinmux in board.dts */
+		io-channels = <&adc1 10>;
+	};
+};

tests/drivers/adc/adc_api/src/test_adc.c

@@ -298,7 +298,8 @@
 #elif defined(CONFIG_BOARD_MIMXRT1050_EVK) || \
 	defined(CONFIG_BOARD_MIMXRT1050_EVK_QSPI) || \
 	defined(CONFIG_BOARD_MIMXRT1064_EVK) || \
-	defined(CONFIG_BOARD_MIMXRT1060_EVK)
+	defined(CONFIG_BOARD_MIMXRT1060_EVK) || \
+	defined(CONFIG_BOARD_MIMXRT1024_EVK)
 #define ADC_DEVICE_NAME		DT_LABEL(DT_INST(0, nxp_mcux_12b1msps_sar))
 #define ADC_RESOLUTION		12
 #define ADC_GAIN		ADC_GAIN_1