drivers: led: ltc3208: Add support for LTC3208

doc/sphinx/source/drivers/led/ltc3208.rst

@@ -0,0 +1 @@
+.. include:: ../../../../../drivers/led/ltc3208/README.rst

doc/sphinx/source/projects/led/ltc3208.rst

@@ -0,0 +1 @@
+.. include:: ../../../../../projects/ltc3208/README.rst

doc/sphinx/source/projects_doc.rst

@@ -98,4 +98,12 @@ GYROSCOPES
    :maxdepth: 1
    :glob:
 
-   projects/gyroscope/*
+   projects/gyroscope/*
+
+LED
+===
+.. toctree::
+   :maxdepth: 1
+   :glob:
+
+   projects/led/*

drivers/led/ltc3208/README.rst

@@ -0,0 +1,80 @@
+LTC3208 no-OS driver
+====================
+
+.. no-os-doxygen::
+
+Supported Devices
+-----------------
+
+`LTC3208 <https://www.analog.com/en/products/ltc3208.html>`_
+
+Overview
+--------
+
+The LTC3208 is a highly integrated multidisplay LED
+controller. The part contains a 1A high efficiency, low noise
+charge pump to provide power to the MAIN, SUB, RGB, CAM
+and AUX LED displays. The LTC3208 requires only small
+ceramic capacitors and one current set resistor to form a
+complete LED power supply and current controller
+
+The maximum display currents are set by a single external resistor. 
+Current for each LED is controlled by a precision internal 
+current source. Dimming and On/Off for all displays is achieved 
+via the I2C serial interface. 
+256 brightness levels are available for the MAIN and SUB displays. 
+16 levels are available for the RGB and CAM displays. 
+Four AUX current sources can be independently
+assigned via the I2C port to the CAM, SUB, MAIN or AUX
+DAC controlled displays.
+
+Applications
+------------
+
+* Video/Camera Phones with QVGA + Displays
+
+LTC3208 Device Configuration
+----------------------------
+
+Driver Initialization
+---------------------
+
+In order to be able to use the device, you will have to provide the support for
+the communication protocol (I2C) as mentioned above.
+
+The first API to be called is **ltc3208_init**. Make sure that it returns 0,
+which means that the driver was initialized correctly.
+
+4-bit LED Configuration
+-----------------------
+
+The following pairs share one register each pair to control the current level:
+	RED and GREEN - GREEN uses the hight bits and RED uses
+	the low bits.
+	BLUE and AUX - AUX uses the hight bits and BLUE uses
+	the low bits.
+
+The current level for cam is also split between the high current and low with
+CAM_HIGH using the hight bits and CAM_LOW using the low bits.
+
+These current level can be controlled using **ltc3208_set_4_bit_dac**,
+where it selects which register to change using an enumeration of the registers.
+
+8-bit LED Configuration
+-----------------------
+
+The MAIN and SUB LEDS uses 255 levels to control current.
+
+These current level can be controlled using **ltc3208_set_8_bit_dac**,
+where it selects which register to change using an enumeration of the registers.
+
+Device Options Configuration
+----------------------------
+
+The device can be forced to operate on a specific charge pump configuration, 
+enable dropout signal, choose if cam high or low is used, and choose if 
+ENRGBS pin controls RGB or SUB. This can be set individually via 
+**ltc3208_set_cpo_2x**, **ltc3208_set_1p5x**, 
+**ltc3208_set_droupout_enable**,  **ltc3208_set_cam_enable**, 
+**ltc3208_set_sub_enable**, or directly to the register
+via **ltc3208_update_options**.