Add initial support for slimport anx7625

Hi all,

The following series add support for the Slimport ANX7625 transmitter, a ultra-low power Full-HD 4K MIPI to DP transmitter designed for portable device.

This is the v17 version, any mistakes, please let me know, I will fix it in the next series.

Change history:
v17: Fix comments from Dan
- Fix possible memory leak of 'edid'

v16: Fix compile error
- Fix compiling error of incompitible interface of ".mode_valid()"

v15: Fix comments from Sam and Hsin-Yi Wang
- Remove connector
- Allocate memory for edid at ".get_edid()"

v14: Fix comments from Sam and Nicolas
- Check flags at drm_bridge_attach
- Use panel_bridge instead of drm_panel
- Fix not correct return value

v13: Fix comments from Launrent Pinchart and Rob Herring
- Picked up Rob's Reviewed-By
- Add .detect and .get_edid interface in bridge funcs.

v12: Fix comments from Hsin-Yi Wang
- Rebase the code on kernel 5.7, fix DRM interface not match issue.

v11: Fix comments from Rob Herring
- Update commit message.
- Remove unused label.

v10: Fix comments from Rob Herring, Daniel.
- Fix dt_binding_check warning.
- Update description.

v9: Fix comments from Sam, Nicolas, Daniel
- Remove extcon interface.
- Remove DPI support.
- Fix dt_binding_check complains.
- Code clean up and update description.

v8: Fix comments from Nicolas.
- Fix several coding format.
- Update description.

v7:
- Fix critical timing(eg:odd hfp/hbp) in "mode_fixup" interface, enhance MIPI RX tolerance by setting register MIPI_DIGITAL_ADJ_1 to 0x3D.

Xin Ji (2):
dt-bindings: drm/bridge: anx7625: MIPI to DP transmitter DT schema drm/bridge: anx7625: Add anx7625 MIPI DSI/DPI to DP

 .../bindings/display/bridge/analogix,anx7625.yaml  |   95 +
 drivers/gpu/drm/bridge/analogix/Kconfig            |    9 +
 drivers/gpu/drm/bridge/analogix/Makefile           |    1 +
 drivers/gpu/drm/bridge/analogix/anx7625.c          | 1850 ++++++++++++++++++++
 drivers/gpu/drm/bridge/analogix/anx7625.h          |  390 +++++
 5 files changed, 2345 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/bridge/analogix,anx7625.yaml
 create mode 100644 drivers/gpu/drm/bridge/analogix/anx7625.c
 create mode 100644 drivers/gpu/drm/bridge/analogix/anx7625.h

2.7.4