drm/bridge: chrontel-ch7033: Add a new driver
This is a driver for video encoder with VGA and DVI/HDMI outputs.
There is no documentation for the chip -- the operation was guessed from
what was sniffed on a Dell Wyse 3020 ThinOS terminal, the register names
come from the ch7035 driver in Mediatek's GPL code dump.
Only bare minimum is implemented -- no fancy stuff, such as scaling. That
would only worsen our misery. We don't load the firmware and we don't need
to even bother enabling the MCU. There are probably no distributable
firmware images anyway.
Just like the tda998x driver, this one uses the component framework and
adds an encoder on component bind, so that it works with the Armada DRM
driver.
Tested with a handful of monitors ranging from 1024x768@75 to 1400x1050@60,
with VGA as well as DVI.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
---
Changes since v3:
- Cosmetic changes; drop ch7033_encoder_destroy() and use
drm_encoder_cleanup() for drm_encoder_funcs.destroy callback
directly.
Changes since v1:
- Sort the includes
- Drop a useless model id read
- Chain to the bridge-connector instead of dealing with the HPD/EDID
readout machinery ourselves
- Utilize regmap to access the registers
3 files changed
