[PATCH V6 0/4] drm/panel: Add Magnachip D53E6EA8966 Panel Controller

Chris Morgan
2022-12-15T18:52:32Z

Add the Magnachip D53E6EA8966 panel IC controller for display panels
such as the Samsung AMS495QA01 panel as found on the Anbernic RG503.
This panel uses DSI to receive video signals, but 3-wire SPI to receive
command signals using DBI.

Changes since V5:
- Reverted dt binding documentation name back to
samsung,ams495qa01.yaml.
- Removed no longer needed of_graph.h header file.
- Added backlight as a dependency.

Changes since V4:
- Renamed driver from the panel model to the panel IC controller per
DRM team.
- Added a drm_of helper function of drm_of_get_dsi_bus() to handle
finding and populating the DSI node when the DSI node is not the
parent of the DSI controlled display.
- Converted the documented commands to constants to make it more
readable.
- Reset GPIO is now required and documented as GPIO_ACTIVE_LOW.
- Removed "prepared" logic from panel.

Changes since V3:
- Updated documentation to add spi-peripheral-props.yaml per updates
made for similar devices. Note that I removed a "Reviewed-by" tag
from Rob Herring since this change probably needs to be confirmed.
- Added binding for RG503, since this device is now accepted with this
request: https://lore.kernel.org/linux-rockchip/166274831283.21181.6861718157177507544.b4-ty@sntech.de/

Changes since V2:
- Added 50hz mode at request of userspace devs.
- Renamed "dupa" to panel name. Good catch Maya.
- Added Maya's Signed-off-by.
- Removed check for max backlight, since it is already done by
backlight_device_set_brightness.
- Fixed minor formatting issues on devicetree binding documentation
and added port to provided example.

Changes since V1:
- Removed errant reference to backlight in documentation. This is an
OLED panel.
- Made elvss regulator optional. In my case its hard wired and not
controllable.
- Added "prepared" enum to track panel status to prevent unbalanced
regulator enable/disable.

Chris Morgan (4):
drm: of: Add drm_of_get_dsi_bus helper function
dt-bindings: display: panel: Add Samsung AMS495QA01
drm/panel: Add Magnachip D53E6EA8966 Panel Driver
arm64: dts: rockchip: add display to RG503

.../display/panel/samsung,ams495qa01.yaml | 57 ++
.../dts/rockchip/rk3566-anbernic-rg503.dts | 55 ++
drivers/gpu/drm/drm_of.c | 62 +++
drivers/gpu/drm/panel/Kconfig | 11 +
drivers/gpu/drm/panel/Makefile | 1 +
.../drm/panel/panel-magnachip-d53e6ea8966.c | 514 ++++++++++++++++++
include/drm/drm_of.h | 11 +
7 files changed, 711 insertions(+)
create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,ams495qa01.yaml
create mode 100644 drivers/gpu/drm/panel/panel-magnachip-d53e6ea8966.c