[PATCH v5 0/3] Add PinePhone Pro display support

[Javier Martinez Canillas <javierm@redhat.com>]

This series adds support for the display present in the PinePhone Pro.

Patch #1 adds a devicetree binding schema for panels based on the Himax
HX8394 controller, such as the HSD060BHW4 720x1440 TFT LCD panel present
in the PinePhone Pro. Patch #2 adds the panel driver for this controller
and finally patch #3 adds an entry for the driver in MAINTAINERS file.

This version doesn't include the DTS changes, since Ondrej mentioned that
there are still things to sort out before enabling it. The DTS bits will
be proposed as a follow-up patch series.

This allows for example the Fedora distro to support the PinePhone Pro with
a DTB provided by the firmware.

This is a v5 of the patch-set that addresses issues pointed out in v4:

https://lists.freedesktop.org/archives/dri-devel/2022-December/384810.html

The patches were tested on a PinePhone Pro Explorer Edition using a Fedora
37 Workstation image.

Best regards,
Javier

Changes in v5:
- List Ondrej Jirman as a maintainer in the DT binding schema document.
- Add Peter Robinson's Tested-by tag.
- List Ondrej Jirman as a maintainer in the driver's MAINTAINERS entry.

Changes in v4:
- Add fallback "himax,hx8394" compatible for the panel controller (Jagan Teki).
- Add Tom Fitzhenry's Tested-by tag.
- Add Sam Ravnborg's Acked-by tag.

Changes in v3:
- Fix example snippet for `make dt_binding_check` to pass (Krzysztof Kozlowski).
- Add Sam Ravnborg's reviwed-by tag.
- Move driver patch after one introducing the DT binding (Sam Ravnborg).

Changes in v2:
- Drop redundant "bindings" in subject (Krzysztof Kozlowski).
- Drop "device tree bindings" in title (Krzysztof Kozlowski).
- Put port next to other "true" properties (Krzysztof Kozlowski).
- Add Krzysztof Kozlowski's Reviewed-by tag.
- Add year to driver's copyright notice (Sam Ravnborg)
- Remove unused <video/display_timing.h> header include (Sam Ravnborg).
- Use mipi_dsi_dcs_write_seq() helper and drop custom macro (Sam Ravnborg).
- Drop unnecessary info messages and move useful one to debug (Sam Ravnborg).

Javier Martinez Canillas (2):
  dt-bindings: display: Add Himax HX8394 panel controller
  MAINTAINERS: Add entry for Himax HX8394 panel controller driver

Kamil Trzciński (1):
  drm: panel: Add Himax HX8394 panel controller driver

 .../bindings/display/panel/himax,hx8394.yaml  |  76 +++
 MAINTAINERS                                   |   8 +
 drivers/gpu/drm/panel/Kconfig                 |  12 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-himax-hx8394.c    | 451 ++++++++++++++++++
 5 files changed, 548 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/himax,hx8394.yaml
 create mode 100644 drivers/gpu/drm/panel/panel-himax-hx8394.c

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2.38.1