Initial en11 exploration.

app/src/drivers/sensors/en11/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+zephyr_library()
+
+zephyr_library_sources_ifdef(CONFIG_EN11 en11.c)
+zephyr_library_sources_ifdef(CONFIG_EN11_TRIGGER en11_trigger.c)

app/src/drivers/sensors/en11/Kconfig

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+# EN11 incremental encoder sensor configuration options
+
+# Copyright (c) 2020 Peter Johanson
+# SPDX-License-Identifier: MIT
+
+menuconfig EN11
+	bool "EN11 Incremental Encoder Sensor"
+	depends on GPIO
+	help
+	  Enable driver for EN11 incremental encoder sensors.
+
+if EN11
+
+choice
+	prompt "Trigger mode"
+	default EN11_TRIGGER_NONE
+	help
+	  Specify the type of triggering to be used by the driver.
+
+config EN11_TRIGGER_NONE
+	bool "No trigger"
+
+config EN11_TRIGGER_GLOBAL_THREAD
+	bool "Use global thread"
+	depends on GPIO
+	select EN11_TRIGGER
+
+config EN11_TRIGGER_OWN_THREAD
+	bool "Use own thread"
+	depends on GPIO
+	select EN11_TRIGGER
+
+endchoice
+
+config EN11_TRIGGER
+	bool
+
+config EN11_THREAD_PRIORITY
+	int "Thread priority"
+	depends on EN11_TRIGGER_OWN_THREAD
+	default 10
+	help
+	  Priority of thread used by the driver to handle interrupts.
+
+config EN11_THREAD_STACK_SIZE
+	int "Thread stack size"
+	depends on EN11_TRIGGER_OWN_THREAD
+	default 1024
+	help
+	  Stack size of thread used by the driver to handle interrupts.
+
+endif # EN11