boards: add adc support to the mimxrt1050 board

add adc to board dts file,
update yaml files and documentation,
add adc 1 channel pins 1 and 15 to the pinmux file,
add overlay file to the board adc sample,
add board to the adc test file and

Signed-off-by: Andrei Auchynnikau <ovchinnikov@strim-tech.com>

boards/arm/mimxrt1050_evk/doc/index.rst

@@ -116,6 +116,8 @@ features:
 +-----------+------------+-------------------------------------+
 | USB       | on-chip    | USB device                          |
 +-----------+------------+-------------------------------------+
+| ADC       | on-chip    | adc                                 |
++-----------+------------+-------------------------------------+
 
 The default configuration can be found in the defconfig file:
 
@@ -159,6 +161,8 @@ The MIMXRT1050 SoC has five pairs of pinmux/gpio controllers.
 +---------------+-----------------+---------------------------+
 | GPIO_AD_B1_07 | LPUART3_RX      | UART BT HCI               |
 +---------------+-----------------+---------------------------+
+| GPIO_AD_B1_11 | ADC             | ADC1 channel 0            |
++---------------+-----------------+---------------------------+
 | WAKEUP        | GPIO            | SW0                       |
 +---------------+-----------------+---------------------------+
 | GPIO_B0_00    | LCD_CLK         | LCD Display               |

boards/arm/mimxrt1050_evk/mimxrt1050_evk.dts

@@ -93,6 +93,10 @@
 
 arduino_serial: &lpuart3 {};
 
+&adc1 {
+	status = "okay";
+};
+
 &flexspi {
 	status = "okay";
 	ahb-prefetch;

boards/arm/mimxrt1050_evk/mimxrt1050_evk.yaml

@@ -27,3 +27,4 @@ supported:
   - usb_device
   - kscan:touch
   - watchdog
+  - adc

boards/arm/mimxrt1050_evk/mimxrt1050_evk_qspi.yaml

@@ -26,3 +26,4 @@ supported:
   - spi
   - usb_device
   - watchdog
+  - adc

boards/arm/mimxrt1050_evk/pinmux.c

@@ -377,6 +377,15 @@ static int mimxrt1050_evk_init(const struct device *dev)
 	imxrt_usdhc_pinmux_cb_register(mimxrt1050_evk_usdhc_pinmux);
 #endif
 
+#if DT_NODE_HAS_STATUS(DT_NODELABEL(adc1), okay) && CONFIG_ADC
+	/* ADC1 Input 0 */
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_11_GPIO1_IO27, 0U);
+	IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_11_GPIO1_IO27, 0xB0u);
+	/* ADC1 Input 15 */
+	IOMUXC_SetPinMux(IOMUXC_GPIO_AD_B1_10_GPIO1_IO26, 0U);
+	IOMUXC_SetPinConfig(IOMUXC_GPIO_AD_B1_10_GPIO1_IO26, 0xB0u);
+#endif
+
 	return 0;
 }
 

samples/drivers/adc/boards/mimxrt1050_evk.overlay

@@ -0,0 +1,12 @@
+/*
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Copyright (c) 2020 Linaro Limited
+ */
+
+/ {
+	zephyr,user {
+		/* adjust channel number according to pinmux in board.dts */
+		io-channels = <&adc1 0>;
+	};
+};

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

@@ -295,6 +295,16 @@
 #define ADC_1ST_CHANNEL_ID	0
 #define ADC_2ND_CHANNEL_ID	1
 
+#elif defined(CONFIG_BOARD_MIMXRT1050_EVK) || \
+	defined(CONFIG_BOARD_MIMXRT1050_EVK_QSPI)
+#define ADC_DEVICE_NAME		DT_LABEL(DT_INST(0, nxp_mcux_12b1msps_sar))
+#define ADC_RESOLUTION		12
+#define ADC_GAIN		ADC_GAIN_1
+#define ADC_REFERENCE		ADC_REF_INTERNAL
+#define ADC_ACQUISITION_TIME	ADC_ACQ_TIME_DEFAULT
+#define ADC_1ST_CHANNEL_ID	0
+#define ADC_2ND_CHANNEL_ID  1
+
 #elif defined(CONFIG_BOARD_NATIVE_POSIX)
 #define ADC_DEVICE_NAME		DT_LABEL(DT_INST(0, zephyr_adc_emul))
 #define ADC_RESOLUTION		10