boards: mimxrt1015_evk: Enable ADC on RT1015

Enables ADC on RT1015 evaluation board. Channels 1 and 13 are exposed as
pins 2 and 1 of J18 on the EVK.

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

Author: danieldegrasse

boards/arm/mimxrt1015_evk/doc/index.rst

@@ -76,6 +76,8 @@ features:
 +-----------+------------+-------------------------------------+
 | USB       | on-chip    | USB device                          |
 +-----------+------------+-------------------------------------+
+| ADC       | on-chip    | ADC                                 |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 ``boards/arm/mimxrt1015_evk/mimxrt1015_evk_defconfig``
@@ -114,6 +116,10 @@ The MIMXRT1015 SoC has five pairs of pinmux/gpio controllers.
 +---------------+-----------------+---------------------------+
 | GPIO_AD_B0_13 | LPSPI1_SDI      | SPI                       |
 +---------------+-----------------+---------------------------+
+| GPIO_AD_B0_14 | ADC             | ADC1 Channel 1            |
++---------------+-----------------+---------------------------+
+| GPIO_AD_B1_13 | ADC             | ADC1 Channel 13           |
++---------------+-----------------+---------------------------+
 
 System Clock
 ============

boards/arm/mimxrt1015_evk/mimxrt1015_evk.dts

@@ -101,3 +101,7 @@ arduino_serial: &lpuart4 {};
 zephyr_udc0: &usb1 {
 	status = "okay";
 };
+
+&adc1 {
+	status = "okay";
+};

boards/arm/mimxrt1015_evk/mimxrt1015_evk.yaml

@@ -22,3 +22,4 @@ supported:
   - i2c
   - usb_device
   - spi
+  - adc

boards/arm/mimxrt1015_evk/pinmux.c

@@ -106,6 +106,19 @@ static int mimxrt1015_evk_init(const struct device *dev)
 			IOMUXC_SW_PAD_CTL_PAD_DSE(6));
 #endif
 
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(adc1), okay) & CONFIG_ADC
+	/* ADC1 Channels 1 and 13 exposed as pins 2 and 1 on J18 of eval board */
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B0_14_GPIO1_IO14, 0U);
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_13_GPIO1_IO29, 0U);
+
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B0_14_GPIO1_IO14,
+				IOMUXC_SW_PAD_CTL_PAD_SPEED(2) |
+				IOMUXC_SW_PAD_CTL_PAD_DSE(6));
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_13_GPIO1_IO29,
+				IOMUXC_SW_PAD_CTL_PAD_SPEED(2) |
+				IOMUXC_SW_PAD_CTL_PAD_DSE(6));
+#endif
+
 	return 0;
 }
 

samples/drivers/adc/boards/mimxrt1015_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 13>;
+	};
+};

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

@@ -300,7 +300,8 @@
 	defined(CONFIG_BOARD_MIMXRT1064_EVK) || \
 	defined(CONFIG_BOARD_MIMXRT1060_EVK) || \
 	defined(CONFIG_BOARD_MIMXRT1024_EVK) || \
-	defined(CONFIG_BOARD_MIMXRT1010_EVK)
+	defined(CONFIG_BOARD_MIMXRT1010_EVK) || \
+	defined(CONFIG_BOARD_MIMXRT1015_EVK)
 #define ADC_DEVICE_NAME		DT_LABEL(DT_INST(0, nxp_mcux_12b1msps_sar))
 #define ADC_RESOLUTION		12
 #define ADC_GAIN		ADC_GAIN_1