[PATCH v6 0/6] drm/ssd130x: Add support for the Solomon SSD1351 OLED controller

[Amit Barzilai <amit.barzilai22@gmail.com>]

This series adds support for the Solomon SSD1351, a 128x128 65k-color
RGB OLED controller, to the ssd130x DRM driver:

  - Patch 1 adds the device tree binding.

  - Patch 2 switches the SSD133X family from RGB332 to RGB565, bringing
    65k color to the SSD1331.

  - Patches 3 to 5 are preparatory cleanups requested on v3: constify
    the ssd130x_write_data() 'values' parameter, convert
    ssd130x_spi_id[] to C99 initializers, and reimplement
    ssd130x_write_cmd() as a variadic wrapper around
    ssd130x_write_cmds() so a single loop remains.

  - Patch 6 adds the SSD1351 as a new SSD135X_FAMILY. It gets its own
    primary plane update/disable, encoder enable and backlight
    callbacks; only the callbacks with no family-specific logic
    (ssd133x_primary_plane_atomic_check(), ssd133x_crtc_atomic_check()
    and ssd130x_encoder_atomic_disable()) are reused as is. It also
    sends command parameters on the data path, handled in
    ssd130x_write_cmds() via a new cmd_params_are_data flag; see [2]
    for why the split lives there rather than in the SPI transport.

Testing:

  - Patches 1, 3, 4, 5 and 6 are tested on an SSD1351.
  - The SSD1331 RGB565 change (patch 2) was kindly tested by Javier on
    his SSD1331.

Thanks to Javier, Andy, Krzysztof and Fabio for the reviews.

[1] v5 of this series:
    https://lore.kernel.org/dri-devel/20260823111959.17029-1-amit.barzilai22@gmail.com
[2] Command parameter path discussion:
    https://lore.kernel.org/dri-devel/20260811122603.30773-1-amit.barzilai22@gmail.com

---

Changes since v5 [1]:
- Patch 6: move the zero length check to the top of
  ssd130x_write_cmds() so it guards both command paths, and comment
  the len == 1 early return.
- Use the "Assisted-by: LLM" attribution form.
- Rebased on drm-misc-next.
- Collect Andy's Reviewed-by on patch 2 and Javier's on patches 4, 5
  and 6.

Amit Barzilai (6):
  dt-bindings: display: Add Solomon SSD1351 OLED controller
  drm/ssd130x: Change SSD133X color format to RGB565 from RGB332
  drm/ssd130x: Constify ssd130x_write_data() 'values' parameter
  drm/ssd130x: Replace positional ssd130x_spi_id[] initialization with
    C99
  drm/ssd130x: Implement ssd130x_write_cmd() on top of
    ssd130x_write_cmds()
  drm/ssd130x: Add SSD135X_FAMILY and SSD1351 support

 .../bindings/display/solomon,ssd1351.yaml     |  42 ++
 drivers/gpu/drm/solomon/ssd130x-spi.c         |  25 +-
 drivers/gpu/drm/solomon/ssd130x.c             | 421 +++++++++++++++---
 drivers/gpu/drm/solomon/ssd130x.h             |  10 +-
 4 files changed, 433 insertions(+), 65 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/solomon,ssd1351.yaml

base-commit: 766bfba0f3bae329f99b42dcabc3ef11fa368f0b
-- 
2.55.0