[Openpvrsgx-devgroup] CI20/JZ4780 HDMI (was Re: Status & HW to bring)

[Paul Boddie]

On Tuesday 12. November 2019 22.44.56 H. Nikolaus Schaller wrote:
> > Am 11.11.2019 um 13:32 schrieb Paul Boddie <paul at boddie.org.uk>:
> >
> > So, the Ingenic driver would need to be augmented with port/endpoint
> > support, and there would need to be a way of activating the Synopsys
> > driver in the device tree. Exactly how the latter should be done remains
> > a mystery to me at the moment.
> 
> Same for me...

Well, as far as the Synopsys driver is concerned, Paul's references to other 
drivers have helped me find an example:

Documentation/devicetree/bindings/display/bridge/renesas,dw-hdmi.txt

In drivers/gpu/drm/rcar-du/rcar_dw_hdmi.c the Synopsys driver code is 
referenced and a device is defined:

  #include <drm/bridge/dw_hdmi.h>
  ...
  static const struct of_device_id rcar_dw_hdmi_of_table[] = {
          { .compatible = "renesas,rcar-gen3-hdmi" },
          { /* Sentinel */ },
  };
  MODULE_DEVICE_TABLE(of, rcar_dw_hdmi_of_table);

The specialised device is mostly forwarding operations to the general device 
code. Presumably something similar would be needed for the JZ4780.

Paul