This series add support for the ST7571 LCD Controller. It is a 4 gray scale dot matrix LCD controller that supports several interfaces such as SPI, I2C and a 8bit parallell port. The controlelr supports both monochrome and grayscale displays.
This driver only supports the I2C interface, but all common parts could easily be put into a common file to be used with other interfaces. I only have I2C to test with. The device is a little defiant, it tends to NAK some commands, but all commands takes effect, hence the I2C_M_IGNORE_NAK flag. Signed-off-by: Marcus Folkesson <marcus.folkes...@gmail.com> --- Changes in v6: - Rebase on drm-misc/drm-next - Silent checkpatch --strict warnings - Link to v5: https://lore.kernel.org/r/20250423-st7571-v5-0-a283b752a...@gmail.com Changes in v5: - Use bitfield macros where appropriate - Add comments where needed - Link to v4: https://lore.kernel.org/r/20250415-st7571-v4-0-8b5c9be8b...@gmail.com Changes in v4: - (dt-binding) Add sitronix,grayscale property - Describe why ignore_nack may be needed - Make drm_to_st7571 an inline function - Add support to clear screen - Change from C2 to R2 - Add support for XRGB8888 - Use dev_err_probe() where appropriate - Make Kconfig config depend on MMU - Introduce device data to prepare for support for other chips - Add support for drm_encoder_helper_funcs.atomic_en(dis)able - Link to v3: https://lore.kernel.org/r/20250408-st7571-v3-0-200693efe...@gmail.com Changes in v3: - (dt-binding) Use 'Controller' rather than 'Panel' in texts - (dt-binding) Constrain the reg property - (dt-binding) Remove panel-timing description - (dt-binding) Change description - Mostly cosmetic changes in the driver code - Don't call drm_atomic_helper_shutdown() in remove() - Link to v2: https://lore.kernel.org/r/20250404-st7571-v2-0-4c78aab9c...@gmail.com Changes in v2: - Reworked pretty much the whole driver to not use obsolete code. - Use panel and timing bindings to specify resolution and panel size - Link to v1: https://lore.kernel.org/r/20250402-st7571-v1-0-351d6b9ee...@gmail.com --- Marcus Folkesson (3): dt-bindings: display: Add Sitronix ST7571 LCD Controller drm/st7571-i2c: add support for Sitronix ST7571 LCD controller MAINTAINERS: add entry for Sitronix ST7571 LCD Controller .../bindings/display/sitronix,st7571.yaml | 73 ++ MAINTAINERS | 6 + drivers/gpu/drm/tiny/Kconfig | 11 + drivers/gpu/drm/tiny/Makefile | 1 + drivers/gpu/drm/tiny/st7571-i2c.c | 1002 ++++++++++++++++++++ 5 files changed, 1093 insertions(+) --- base-commit: e270b3665f8321c45ad3e9ba4e3d0fbaf8c9c720 change-id: 20250401-st7571-9382b9cfc03f Best regards, -- Marcus Folkesson <marcus.folkes...@gmail.com>
