sensor: icm45686: Add basic sensor functionality

- Add support for Fetch/Get API.
- Add support for Read/Decode API.
- Add config settings through device-tree.
- Add bus support for SPI (although easily extensible to others as
based on RTIO).

Fetch/Get API tested with accel_polling sample.
Read/Decode API tested with sensor_shell sample.

Signed-off-by: Luis Ubieda <luisf@croxel.com>

Author: ubieda

drivers/sensor/tdk/CMakeLists.txt

@@ -5,6 +5,7 @@
 add_subdirectory_ifdef(CONFIG_ICM42605 icm42605)
 add_subdirectory_ifdef(CONFIG_ICM42688 icm42688)
 add_subdirectory_ifdef(CONFIG_ICM42X70 icm42x70)
+add_subdirectory_ifdef(CONFIG_ICM45686 icm45686)
 add_subdirectory_ifdef(CONFIG_ICP101XX icp101xx)
 add_subdirectory_ifdef(CONFIG_MPU6050 mpu6050)
 add_subdirectory_ifdef(CONFIG_MPU9250 mpu9250)

drivers/sensor/tdk/Kconfig

@@ -5,6 +5,7 @@
 source "drivers/sensor/tdk/icm42605/Kconfig"
 source "drivers/sensor/tdk/icm42688/Kconfig"
 source "drivers/sensor/tdk/icm42x70/Kconfig"
+source "drivers/sensor/tdk/icm45686/Kconfig"
 source "drivers/sensor/tdk/icp101xx/Kconfig"
 source "drivers/sensor/tdk/mpu6050/Kconfig"
 source "drivers/sensor/tdk/mpu9250/Kconfig"

drivers/sensor/tdk/icm45686/CMakeLists.txt

@@ -0,0 +1,12 @@
+# Copyright (c) 2025 Croxel Inc.
+# Copyright (c) 2025 CogniPilot Foundation
+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+zephyr_library_include_directories(.)
+zephyr_library_sources(
+	icm45686.c
+)
+zephyr_library_sources_ifdef(CONFIG_SENSOR_ASYNC_API
+	icm45686_decoder.c
+)

drivers/sensor/tdk/icm45686/Kconfig

@@ -0,0 +1,13 @@
+# Copyright (c) 2025 Croxel Inc.
+# Copyright (c) 2025 CogniPilot Foundation
+# SPDX-License-Identifier: Apache-2.0
+
+config ICM45686
+	bool "ICM45686 High-precision 6-Axis Motion Tracking Device"
+	default y
+	depends on DT_HAS_INVENSENSE_ICM45686_ENABLED
+	select SPI
+	select SPI_RTIO
+	help
+	  Enable driver for ICM45686 High-precision 6-axis motion
+	  tracking device.