Got it.

-depends on EXTCON=y || (EXTCON=m && DRM_ROCKCHIP=m)
+depends on DRM_ROCKCHIP=m
+select EXTCON

Damian
-----Original Message-----
From: Heiko Stuebner <heiko@sntech.de> 
Sent: Thursday, September 13, 2018 14:32
To: Damian Kos <redacted>
Cc: David Airlie <redacted>; Rob Herring <robh+dt@kernel.org>; Mark Rutland <mark.rutland@arm.com>; Archit Taneja <redacted>; Andrzej Hajda <redacted>; Laurent Pinchart <Laurent.pinchart@ideasonboard.com>; Gustavo Padovan <redacted>; Maarten Lankhorst <maarten.lankhorst@linux.intel.com>; Sean Paul <sean@poorly.run>; Sandy Huang <hjc@rock-chips.com>; Quentin Schulz <redacted>; dri-devel at lists.freedesktop.org; devicetree at vger.kernel.org; linux-kernel at vger.kernel.org; linux-arm-kernel at lists.infradead.org; linux-rockchip at lists.infradead.org; Przemyslaw Gaj <pgaj@cadence.com>; Lukasz Tyrala <redacted>; Scott Telford <redacted>; Artur Jedrysek <redacted>; Piotr Sroka <redacted>
Subject: Re: [PATCH v3 0/5] drm: add support for Cadence MHDP DPI/DP bridge.

EXTERNAL MAIL


Am Dienstag, 28. August 2018, 12:24:43 CEST schrieb Damian Kos:

Hello!

This is the series of patches that will add support for the Cadence's 
DPI/DP bridge. Please note that this is a preliminary version of the 
driver and there will be more patches in the future with updates, fixes and improvements.
Please keep that in mind when looking at FIXME/TODO/XXX comments.

Initially, MHDP driver was developed as a DRM bridge driver and was 
planed to be placed in drivers/gpu/drm/bridge/mhdp.c.  However, there 
was already a driver for Cadence's DP controller developed by 
RockChip, but that driver uses the different DRM framework and looks like a part of a bigger system.
Both controllers (including firmware) are quite different internally 
(MST/FEC/DSC support, link training done by driver, additional 
commands, IRQ's
etc.) but they have similar register map, except for Framer/Streamer 
(which is noticeably different), so they appear similar.

The following patches contain:
- Moving common code to drivers/gpu/drm/bridge/cdns-mhdp-common.* and
  modifying it a bit (mostly new prefixes for functions and data types) so it
  can be used by two, higher level, drivers.
- Modifying existing RockChip's DP driver to use the common code after changes
  made to it (use the new cdns_mhdp_device structure and new function names).
- Modifying DRM helpers a bit. Some are required for new driver, some are
  updates from DP 1.2 to 1.3 or 1.4.
- Adding documentation for device tree bindings.
- Adding preliminary Cadence DPI/DP bridge driver.

Some of the things that will be added later on include (but are not 
limited
to):
- Support for Cadence SD0801 PHY (PHY's driver should be on the way by 
now)
- MST support
- DSC support
- FEC support
- HDCP support

with te Kconfig issue in patch5 fixed, this series tested on
rk3288 (analogix-dp) and rk3399 (analogix-dp + cadence-dp) Everything seems to work that worked before.

Tested-by: Heiko Stuebner <heiko@sntech.de>