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+
+                VPBE V4L2 driver design
+ ======================================================================
+
+ File partitioning
+ -----------------
+ V4L2 display device driver
+         drivers/media/video/davinci/vpbe_display.c
+         drivers/media/video/davinci/vpbe_display.h
+
+ VPBE display controller
+         drivers/media/video/davinci/vpbe.c
+         drivers/media/video/davinci/vpbe.h
+
+ VPBE venc sub device driver
+         drivers/media/video/davinci/vpbe_venc.c
+         drivers/media/video/davinci/vpbe_venc.h
+         drivers/media/video/davinci/vpbe_venc_regs.h
+
+ VPBE osd driver
+         drivers/media/video/davinci/vpbe_osd.c
+         drivers/media/video/davinci/vpbe_osd.h
+         drivers/media/video/davinci/vpbe_osd_regs.h
+
+ Functional partitioning
+ -----------------------
+
+ Consists of the following (in the same order as the list under file
+ partitioning):-
+
+ 1. V4L2 display driver
+    Implements video2 and video3 device nodes and
+    provides v4l2 device interface to manage VID0 and VID1 layers.
+
+ 2. Display controller
+    Loads up venc, osd and external encoders such as ths8200. It provides
+    a set of API calls to V4L2 drivers to set the output/standards
+    in the venc or external sub devices. It also provides
+    a device object to access the services from osd sub device
+    using sub device ops. The connection of external encoders to venc LCD
+    controller port is done at init time based on default output and standard
+    selection or at run time when application change the output through
+    V4L2 IOCTLs.
+
+    When connetected to an external encoder, vpbe controller is also responsible
+    for setting up the interface between venc and external encoders based on
+    board specific settings (specified in board-xxx-evm.c). This allows
+    interfacing external encoders such as ths8200. The setup_if_config()
+    is implemented for this as well as configure_venc() (part of the next patch)
+    API to set timings in venc for a specific display resolution. As of this
+    patch series, the interconnection and enabling ans setting of the external
+    encoders is not present, and would be a part of the next patch series.
+
+ 3. Venc subdevice
+    Responsible for setting outputs provided through internal dacs and also
+    setting timings at LCD controller port when external encoders are connected
+    at the port or LCD panel timings required. When external encoder/LCD panel
+    is connected, the timings for a specific standard/preset is retrieved from
+    the board specific table and the values are used to set the timings in
+    venc using non-standard timing mode.
+
+    Support LCD Panel displays using the venc. For example to support a Logic
+    PD display, it requires setting up the LCD controller port with a set of
+    timings for the resolution supported and setting the dot clock. So we could
+    add the available outputs as a board specific entry (i.e add the "LogicPD"
+    output name to board-xxx-evm.c). A table of timings for various LCDs
+    supported can be maintained in the board specific setup file to support
+    various LCD displays.
+
+ 4. osd subdevice
+    Osd subdevice implements all osd layer management and hardware specific
+    features. In the legacfy drivers (LSPxxx), the hardware specific features
+    are configured through proprietary IOCTLs at the fb device interface. Since
+    subdevices are going to support device nodes, application will be able
+    to configure the hardware feature directly by opening the osd subdevice
+    node and by calling the related IOCTL. So these proprietary IOCTLs are
+    to be removed from the FB Device driver when doing up port of these drivers to
+    mainline kernel. The V4L2 and FB device nodes supports only IOCTLS as per
+    the associated spec. The rest of the IOCTLs are to be moved to osd and
+    venc subdevices.
+
+ Current status:-
+
+ A build tested version of vpbe controller is available.
+
+ Following are TBDs.
+
+ vpbe display controller
+    - review and modify the handling of external encoders.
+    - add support for selecting external encoder as default at probe time.
+
+ vpbe venc sub device
+    - add timings for supporting ths8200
+    - add support for LogicPD LCD.
+
+ v4l2 driver
+    - A version is already developed which is to be cleaned up and unit tested
+
+ FB drivers
+    - Add support for fbdev drivers.- Ready and part of subsequent patches.
