This adds support for the 1.44", 1.9", 2.0" and 2.7" Pervasive Diplays monochrome e-ink panels. The code was taken from the userspace driver available through repaper.org.
Monochrome Since drm doesn't have support for monochrome, I have added a helper to convert XRGB8888 to greyscale8. XRGB8888 is very common so that's why I chose that format, but maybe some YUV format is better suited, I don't know. There are some greyscale e-ink panels, so that's why I chose greyscale instead of going directly to monochrome.
I have hacked together a python drm library to make it easy to use these displays, mainly targeted at the maker community: https://github.com/notro/pydrm
Noralf.
Noralf Trønnes (4): of: Add vendor prefix for Pervasive Displays dt-bindings: Add Pervasive Displays RePaper bindings drm/tinydrm: Add tinydrm_xrgb8888_to_gray8() helper drm/tinydrm: Add RePaper e-ink driver
.../devicetree/bindings/display/repaper.txt | 52 + .../devicetree/bindings/vendor-prefixes.txt | 1 + MAINTAINERS | 6 + drivers/gpu/drm/tinydrm/Kconfig | 12 + drivers/gpu/drm/tinydrm/Makefile | 1 + drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 74 +- drivers/gpu/drm/tinydrm/repaper.c | 1095 ++++++++++++++++++++ include/drm/tinydrm/tinydrm-helpers.h | 1 + 8 files changed, 1240 insertions(+), 2 deletions(-) create mode 100644 Documentation/devicetree/bindings/display/repaper.txt create mode 100644 drivers/gpu/drm/tinydrm/repaper.c