doc: reference: Add the LED and LED Strip APIs

Add the LED (regular and strip) APIs to the doc.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>

doc/reference/peripherals/index.rst

@@ -20,6 +20,7 @@ Peripherals
    i2s.rst
    ipm.rst
    kscan.rst
+   led.rst
    pinmux.rst
    pwm.rst
    ps2.rst

doc/reference/peripherals/led.rst

@@ -0,0 +1,33 @@
+.. _led_api:
+
+LED
+###
+
+Overview
+********
+
+The LED API provides access to Light Emitting Diodes, both in individual and
+stip form.
+
+Configuration Options
+*********************
+
+Related configuration options:
+
+* :option:`CONFIG_LED`
+* :option:`CONFIG_LED_STRIP`
+
+API Reference
+*************
+
+LED
+===
+
+.. doxygengroup:: led_interface
+   :project: Zephyr
+
+LED Strip
+=========
+
+.. doxygengroup:: led_strip_interface
+   :project: Zephyr

include/drivers/led.h

@@ -4,12 +4,19 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
+/**
+ * @file
+ * @brief Public LED driver APIs
+ */
+
 #ifndef ZEPHYR_INCLUDE_DRIVERS_LED_H_
 #define ZEPHYR_INCLUDE_DRIVERS_LED_H_
 
 /**
- * @file
- * @brief Public LED driver APIs
+ * @brief LED Interface
+ * @defgroup led_interface LED Interface
+ * @ingroup io_interfaces
+ * @{
  */
 
 #include <zephyr/types.h>
@@ -144,6 +151,10 @@ static inline int z_impl_led_off(struct device *dev, u32_t led)
 	return api->off(dev, led);
 }
 
+/**
+ * @}
+ */
+
 #include <syscalls/led.h>
 
 #endif	/* ZEPHYR_INCLUDE_DRIVERS_LED_H_ */

include/drivers/led_strip.h

@@ -4,9 +4,6 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-#ifndef ZEPHYR_INCLUDE_DRIVERS_LED_STRIP_H_
-#define ZEPHYR_INCLUDE_DRIVERS_LED_STRIP_H_
-
 /**
  * @file
  * @brief Public API for controlling linear strips of LEDs.
@@ -15,6 +12,16 @@
  * addressable strips of LEDs.
  */
 
+#ifndef ZEPHYR_INCLUDE_DRIVERS_LED_STRIP_H_
+#define ZEPHYR_INCLUDE_DRIVERS_LED_STRIP_H_
+
+/**
+ * @brief LED Strip Interface
+ * @defgroup led_strip_interface LED Strip Interface
+ * @ingroup io_interfaces
+ * @{
+ */
+
 #include <zephyr/types.h>
 #include <device.h>
 
@@ -126,4 +133,8 @@ static inline int led_strip_update_channels(struct device *dev,
 }
 #endif
 
+/**
+ * @}
+ */
+
 #endif	/* ZEPHYR_INCLUDE_DRIVERS_LED_STRIP_H_ */