[v2,0/3] drm: panel: Add Generic MIPI Panel Driver

Message

Hironori KIKUCHI Feb. 26, 2025, 11:25 a.m. UTC

This is a Generic MIPI-DSI / DPI(+SPI) dual stack panel driver.

Although the MIPI specifications define how to communicate with a panel
to display an image, some panels still require a panel-specific
initialization sequence to be sent.

While there are many dedicated drivers for such panels, they are very
similar to each other, except for the configuration parameters, including
the initialization sequence for each panel.
Since there are numerous panels in the wild, adding parameters to
the driver for each panel every time is a pain.

Instead, this driver offers more generic and convenient method.

Its fundamental approach is similar to the `panel-mipi-dbi` driver,
which sends an initialization sequence stored in a firmware file.

Moreover, this driver allows display modes, timings, and panel
configuration parameters to be stored in the same file.

I've also come up with a firmware generator [1].
It helps to create or configure the panel parameters on the web.

As a reference, similar generic drivers currently exist:
  * drivers/gpu/drm/panel/panel-simple.c
    - Supports wide variety of panels, but no init-sequence support
  * drivers/gpu/drm/tiny/panel-mipi-dbi.c
    - Supports init-sequence, but only supports DBI panels
  * drivers/gpu/drm/panel/panel-dsi-cm.c
    - Supports DSI Command Mode, but no init-sequence support

[1]: https://kikuchan.github.io/panel-firmware-generator/

v2:
  - Drop redundant properties from the DT binding
  - Fix the compatible property and examples in the DT binding
  - Drop support for the redundant DT properties from the driver
  - Fix minor issue in the driver
  - Add panels to the DT binding

Regards,
kikuchan.

Hironori KIKUCHI (3):
  dt-bindings: vendor-prefixes: Add hothmi vendor prefix
  dt-bindings: display: panel: Add some generic MIPI-DSI/DPI panels
  drm: panel: Add a driver for Generic MIPI-DSI/DPI(+SPI) panels

 .../bindings/display/panel/panel-mipi.yaml    |  121 ++
 .../devicetree/bindings/vendor-prefixes.yaml  |    2 +
 drivers/gpu/drm/panel/Kconfig                 |   10 +
 drivers/gpu/drm/panel/Makefile                |    1 +
 drivers/gpu/drm/panel/panel-mipi.c            | 1181 +++++++++++++++++
 5 files changed, 1315 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/panel-mipi.yaml
 create mode 100644 drivers/gpu/drm/panel/panel-mipi.c