It's a 5.5" 720x1440 TFT LCD MIPI DSI panel with built in touchscreen and backlight as found in the Librem 5 devkit.
These patches are against linux next as of 2019-02-08.
Guido Günther (3): dt-bindings: Add vendor prefix for ROCKTECH DISPLAYS LIMITED dt-bindings: Add Rocktech jh057n00900 panel bindings drm/panel: Add Rocktech jh057n00900 panel driver
.../display/panel/rocktech,jh057n00900.txt | 18 + .../devicetree/bindings/vendor-prefixes.txt | 1 + drivers/gpu/drm/panel/Kconfig | 12 + drivers/gpu/drm/panel/Makefile | 1 + .../drm/panel/panel-rocktech-jh057n00900.c | 414 ++++++++++++++++++ 5 files changed, 446 insertions(+) create mode 100644 Documentation/devicetree/bindings/display/panel/rocktech,jh057n00900.txt create mode 100644 drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c