[U-Boot] [PATCH 00/18] dm: video: Introduce initial driver-model video support

[Hannes Schmelzer]

Hi Simon,
> This series starts the process of converting LCD and video devices over to
> use driver model. Both now use a very similar API thanks to earlier work by
> Nikita Kiryanov. With the driver-model conversion these will end up unified
> in a single uclass.
>
> Unfortunately there are different features supported by each. This
> implementation provides for a common set of features which should serve
> most purposes. The intent is to support:
>
> - bitmap devices with 8, 16 and 32 bits per pixel
> - text console wih white on black or vice versa
> - rotated text console
> - bitmap display (BMP format)
>
> More can be added as additional boards are ported over to use driver model
> for video.
>
> The name 'video' is chosen for the uclass since it is more generic than LCD.
> Another option would be 'display' but that would introduce a third concept
> to U-Boot which seems like the wrong approach.
This is very welcome ... i will patch my tree with your changes and try 
to adapt my LCD-driver (am335xfb.c) to new driver-model and run some 
tests on the B&R boards.
> The existing LCD and video init functions are not needed now, so this uclass
> does not implement them. This includes lcd_ctrl_init(), lcd_enable() and
> video_init().
This is not true for me, i use this functions to setup lcd-timings and 
backlight switch on.
You can have a look at the B&R tseries board.
Maybe we can consider how to setup an lcd device (different timing, 
backlights) in future,
> Tests are provided to check that console text and bitmap output is correct.
> These should be able to be extended as more features are added.
>
> Future work will convert a few boards over to use driver model for video.
> Likely targets are x86, exynos, tegra. Also, Rockchip LCD support will be
> added using driver model (patches will likely be sent some time in January).
best regards,
Hannes