[PATCH v1 0/4] video: add ILI9488 panel support with MIPI DBI Type C1

[Giandomenico Rossi <rossi@amelchem.com>]

Hi,

this series adds support for TFT LCD panels based on the Ilitek ILI9488
controller connected via MIPI DBI Type C Option 1 over SPI.

The target panel is the Winstar WF35-320480UD (480x320, RGB666 18-bit),
used on a custom STM32MP151A-based board by Amel s.r.l.

MIPI DBI Type C Option 1 requires 9-bit SPI transfers where the MSB
encodes the Data/Command flag. Since many SPI controllers do not support
9 bits-per-word natively, a native 9-bit implementation and an 8-bit
emulation fallback are both provided.

The series is structured as follows:

  [1/4] Extends the mipi_dbi core with Type C Option 1 transfer
        support, including 8-bit emulation for controllers that lack
        native 9-bit SPI capability.

  [2/4] Adds a rotation field to struct mipi_dbi_dev so that panel
        drivers can configure the MADCTL register from a device tree
        property.

  [3/4] Device tree binding documentation for ILI9488-based panels,
        with a vendor-specific compatible for the Winstar WF35-320480UD.

  [4/4] The ILI9488 panel driver itself, with RGB565-to-RGB666
        framebuffer conversion, backlight control and rotation support.

Tested on an STM32MP151A-based board with SPI and a WF35-320480UD
panel.

Giandomenico Rossi (4):
  video: mipi-dbi: support for MIPI DBI Type C Option 1
  video: mipi-dbi: add display rotation support
  dt-bindings: display: panel: add Ilitek ILI9488 panel
  video: add Ilitek ILI9488 driver for WF35 panel

 drivers/video/Kconfig                         |  10 +
 drivers/video/Makefile                        |   1 +
 drivers/video/mipi_dbi.c                      | 263 +++++++++-
 drivers/video/panel-ilitek-ili9488.c          | 490 ++++++++++++++++++
 .../display/panel/panel-ilitek-ili9488.yaml   | 120 +++++
 include/video/mipi_dbi.h                      |  17 +
 6 files changed, 892 insertions(+), 9 deletions(-)
 create mode 100644 drivers/video/panel-ilitek-ili9488.c
 create mode 100644 dts/Bindings/display/panel/panel-ilitek-ili9488.yaml

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2.34.1