drivers: hwinfo: add driver support for NXP i.mx RT device ID

Add driver support for NXP i.mx RT ID device.
This device has an ID of 8 bytes.

Signed-off-by: Alexander Wachter <alexander.wachter@student.tugraz.at>

boards/arm/mimxrt1020_evk/mimxrt1020_evk.yaml

@@ -16,3 +16,4 @@ ram: 32768
 flash: 8192
 supported:
   - i2c
+  - hwinfo

boards/arm/mimxrt1050_evk/mimxrt1050_evk.yaml

@@ -19,3 +19,4 @@ supported:
   - i2c
   - spi
   - netif:eth
+  - hwinfo

boards/arm/mimxrt1050_evk/mimxrt1050_evk_qspi.yaml

@@ -17,3 +17,4 @@ flash: 8192
 supported:
   - spi
   - netif:eth
+  - hwinfo

boards/arm/mimxrt1064_evk/mimxrt1064_evk.yaml

@@ -14,3 +14,5 @@ toolchain:
   - xtools
 ram: 128
 flash: 128
+supported:
+  - hwinfo

drivers/hwinfo/CMakeLists.txt

@@ -4,5 +4,6 @@ zephyr_sources_ifdef(CONFIG_HWINFO      hwinfo_weak_impl.c)
 zephyr_sources_ifdef(CONFIG_HWINFO_STM32      hwinfo_stm32.c)
 zephyr_sources_ifdef(CONFIG_HWINFO_NRF        hwinfo_nrf.c)
 zephyr_sources_ifdef(CONFIG_HWINFO_MCUX_SIM   hwinfo_mcux_sim.c)
+zephyr_sources_ifdef(CONFIG_HWINFO_IMXRT      hwinfo_imxrt.c)
 
 zephyr_sources_ifdef(CONFIG_HWINFO_SHELL hwinfo_shell.c)

drivers/hwinfo/Kconfig

@@ -40,4 +40,11 @@ config HWINFO_MCUX_SIM
 	help
 	  Enable NXP kinetis mcux hwinfo driver.
 
+config HWINFO_IMXRT
+	bool "NXP i.mx RT device ID"
+	default y
+	depends on SOC_SERIES_IMX_RT
+	help
+	  Enable NXP i.mx RT hwinfo driver.
+
 endif

drivers/hwinfo/hwinfo_imxrt.c

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2019 Alexander Wachter
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#include <soc.h>
+#include <hwinfo.h>
+#include <string.h>
+
+struct imxrt_uid {
+	u32_t id[2];
+};
+
+ssize_t _impl_hwinfo_get_device_id(u8_t *buffer, size_t length)
+{
+	struct imxrt_uid dev_id;
+
+	dev_id.id[0] = OCOTP->CFG1;
+	dev_id.id[1] = OCOTP->CFG2;
+
+	if (length > sizeof(dev_id.id)) {
+		length = sizeof(dev_id.id);
+	}
+
+	memcpy(buffer, dev_id.id, length);
+
+	return length;
+}