[PATCH v8 0/2] Add support of Lontium lt8912 MIPI to HDMI bridge

[Adrien Grassein <adrien.grassein@gmail.com>]

Hi,
this patch set adds the support of the Lontium lt8912 MIPI to HDMI
bridge in the kernel.

It's only support the video part, not the audio part yet
since I don't have the datasheet of this component.
I get the current i2c configuration from Digi and
Boundary drivers.
Developed using the DB_DSIHD board from BoundaryDevices.

Update in v2
  - Use standard data-lanes instead of a custom prop;
  - Use hdmi-connector node.

Update in v3
  - Fix indentation;
  - Implement missing bridge functions;
  - Add some comments.

Update in v4
  - Fix bridge ops;
  - Fix i2c error detection.

Update in v5
  - Fix lt8912 name (lt8912b instead of lt8912);
  - Implement HPD via a workaround. In fact I don't have the datasheet
    of this component yet so I can't say if the configuration of the
registers is correct or if I have an HW issue on my board. So, I choose
to implement a fake version of HPD using a workqueue and polling the
status regularly.

Update in v6
  - Fix a warning found by "kernel test robot"

Update in v7
  - Fix HPD logic (via an HW emulation);
  - HPD from chip is still not working.

Update in v8
  - Remove HPD logic (will be added later when HW bug qill be fixed).

Thanks,

Adrien Grassein (2):
  dt-bindings: display: bridge: Add documentation for LT8912B
  drm/bridge: Introduce LT8912B DSI to HDMI bridge

 .../display/bridge/lontium,lt8912b.yaml       | 102 +++
 MAINTAINERS                                   |   6 +
 drivers/gpu/drm/bridge/Kconfig                |  14 +
 drivers/gpu/drm/bridge/Makefile               |   1 +
 drivers/gpu/drm/bridge/lontium-lt8912b.c      | 765 ++++++++++++++++++
 5 files changed, 888 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/lontium,lt8912b.yaml
 create mode 100644 drivers/gpu/drm/bridge/lontium-lt8912b.c

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2.25.1