[PATCH v5 0/2] Support for Synaptics TDDI series panels

[Kaustabh Chakraborty <kauschluss@disroot.org>]

Synaptics' Touch and Display Driver Integration (TDDI) technology [1]
employs a single chip for both touchscreen and display capabilities.
Such designs reportedly help reducing costs and power consumption.

Although the touchscreens, which are powered by Synaptics'
Register-Mapped Interface 4 (RMI4) touch protocol via I2C or SPI have
driver support in the kernel, the MIPI DSI display panels don't.

This series introduces a rudimentary driver for controlling said display
panels, which supports TD4101 and TD4300 panels.

[1] https://www.synaptics.com/technology/display-integration

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
---
Changes in v5:
- added missing Reviewed-by tag from Krzysztof in [v3 1/2]
- Link to v4: https://lore.kernel.org/r/20250819-panel-synaptics-tddi-v4-0-448f466d16a6@disroot.org

Changes in v4:
- utilized drm_connector_helper_get_modes_fixed() (dmitry.baryshkov)
- constified backlight properties (dmitry.baryshkov)
- Link to v3: https://lore.kernel.org/r/20250720-panel-synaptics-tddi-v3-0-43a5957f4b24@disroot.org

Changes in v3:
- fixed various dt_binding_check errors (robh's bot)
- adjusted commit description of [v2 1/2] (robh)
- utilized devm_drm_panel_alloc() and devm_regulator_bulk_get_const()
- Link to v2: https://lore.kernel.org/r/20250625-panel-synaptics-tddi-v2-0-7a62ab1d13c7@disroot.org

Changes in v2:
- fixed various dt_binding_check errors (conor)
- did s/tddi_update_brightness/tddi_update_status
- added check for panel enable in tddi_update_status()
- used backlight_get_brightness() in appropriate places
- Link to v1: https://lore.kernel.org/r/20250612-panel-synaptics-tddi-v1-0-dfb8a425f76c@disroot.org

---
Kaustabh Chakraborty (2):
      dt-bindings: display: panel: document Synaptics TDDI panel
      drm: panel: add support for Synaptics TDDI series DSI panels

 .../display/panel/synaptics,td4300-panel.yaml      |  89 +++++++
 drivers/gpu/drm/panel/Kconfig                      |  11 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-synaptics-tddi.c       | 276 +++++++++++++++++++++
 4 files changed, 377 insertions(+)
---
base-commit: 5303936d609e09665deda94eaedf26a0e5c3a087
change-id: 20250523-panel-synaptics-tddi-0b0b3f07f814

Best regards,
-- 
Kaustabh Chakraborty <kauschluss@disroot.org>