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