[PATCH 0/2] drm/tiny: Add driver for the sharp LS027B7DH01 Memory LCD

[Mehdi Djait <mehdi.djait@bootlin.com>]

This patch series adds a DRM driver for the sharp LS027B7DH01 memory display:
a 2.7" 400x240 monochrome 1 bit per pixel display SPI device.

This controller uses SPI both for control and for pixel data. Pixel data can be
sent either as one line per SPI frame or multiple lines (up to the entire picture)
in a single SPI frame. This driver implements the latter.

The Sharp Memory LCD requires an alternating signal to prevent the buildup of
a DC bias that would result in a Display that no longer can be updated. Two
modes for the generation of this signal are supported:

- Software, EXTMODE = Low: toggling the BIT(1) of the Command and writing it at
  least once a second to the display.

- Hardware, EXTMODE = High: the alternating signal should be supplied on the
  EXTCOMIN pin.

the Hardware mode is implemented with a PWM signal.

The driver announces the commonly supported XRGB8888 to userspace and
uses the drm_fb_xrgb8888_to_mono() function to convert the format.

Mehdi Djait (2):
  dt-bindings: display: Add Sharp LS027B7DH01 Memory LCD
  drm/tiny: Add driver for the sharp LS027B7DH01 Memory LCD

 .../bindings/display/sharp,ls027b7dh01.yaml   |  71 +++
 MAINTAINERS                                   |   7 +
 drivers/gpu/drm/tiny/Kconfig                  |   8 +
 drivers/gpu/drm/tiny/Makefile                 |   1 +
 drivers/gpu/drm/tiny/sharp-ls027b7dh01.c      | 411 ++++++++++++++++++
 5 files changed, 498 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/sharp,ls027b7dh01.yaml
 create mode 100644 drivers/gpu/drm/tiny/sharp-ls027b7dh01.c

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2.41.0