[PATCH v3 0/5] Add Type-C DP support for RK3399 EVB IND board

[Chaoyi Chen <kernel@airkyi.com>]

From: Chaoyi Chen <chaoyi.chen@rock-chips.com>

This series focuses on adding Type-C DP support for USBDP PHY and DP
driver. The USBDP PHY and DP will perceive the changes in cable status
based on the USB PD and Type-C state machines provided by TCPM. Before
this, the USBDP PHY and DP controller of RK3399 sensed cable state
changes through extcon, and devices such as the RK3399 Gru-Chromebook
rely on them. This series should not break them.

====
1. Altmode switching and orientation switching for USBDP PHY

For USB Type-C interfaces, an external Type-C controller chip assists
by detecting cable attachment, determining plug orientation, and
reporting USB PD message. The USB/DP combo PHY supports software
configurable pin mapping and DisplayPort lane assignment. Based on
these message, the combo PHY can perform both altmode switching and
orientation switching via software.

The RK3399 EVB IND board has a Type-C interface DisplayPort. It use
fusb302 chip as Type-C controller. The connection diagram is shown below:

fusb302 chip +---> USB2.0 PHY ----> DWC3 USB controller
             |
             +---> USB/DP PHY0 +--> CDN-DP controller
                               |
                               +--> DWC3 USB controller
====
2. DP HPD event notify

The RK3399 has two USB/DP combo PHY and one CDN-DP controller. And
the CDN-DP can be switched to output to one of the PHYs.

USB/DP PHY0 ---+
               | <----> CDN-DP controller
USB/DP PHY1 ---+

BTW, one of the important things to do is to implement extcon-like
notifications. I found include/drm/bridge/aux-bridge.h , but if the
aux-bridge is used, the bridge chain would look like this:

PHY0 aux-bridge ---+
                   | ----> CDN-DP bridge
PHY1 aux-bridge ---+

Oh, CDN-DP bridge has two previous aux-bridge!

Now, I try to use drm_connector_oob_hotplug_event() to notify HPD
state between PHY and CDN-DP controller.

Patch1 add new Type-C mode switch for RK3399 USBDP phy binding.
Patch2 add typec_mux and typec_switch for RK3399 USBDP PHY.
Patch3 drops CDN-DP's extcon dependency when Type-C is present.
Patch4 add missing dp_out port for RK3399 CDN-DP.
Patch5 add Type-C DP support for RK3399 EVB IND board.

Changes in v3:
- Link to V2: https://lore.kernel.org/all/20250718062619.99-1-kernel@airkyi.com/
- Add more descriptions to clarify the role of the PHY in switching.
- Fix wrong vdo value.
- Fix port node in usb-c-connector.

Changes in v2:
- Link to V1: https://lore.kernel.org/all/20250715112456.101-1-kernel@airkyi.com/
- Reuse dp-port/usb3-port in rk3399-typec-phy binding.
- Fix compile error when CONFIG_TYPEC is not enabled.
- Notify DP HPD state by USB/DP PHY.
- Ignore duplicate HPD events.
- Add endpoint to link DP PHY and DP controller.
- Fix devicetree coding style.

Chaoyi Chen (5):
  dt-bindings: phy: rockchip: rk3399-typec-phy: Support mode-switch
  phy: rockchip: phy-rockchip-typec: Add typec_mux/typec_switch support
  drm/rockchip: cdn-dp: Support handle lane info and HPD without extcon
  arm64: dts: rockchip: Add missing dp_out port for RK3399 CDN-DP
  arm64: dts: rockchip: rk3399-evb-ind: Add support for DisplayPort

 .../phy/rockchip,rk3399-typec-phy.yaml        |   6 +
 arch/arm64/boot/dts/rockchip/rk3399-base.dtsi |  12 +-
 .../boot/dts/rockchip/rk3399-evb-ind.dts      | 146 +++++++
 drivers/gpu/drm/rockchip/cdn-dp-core.c        |  37 +-
 drivers/phy/rockchip/phy-rockchip-typec.c     | 403 +++++++++++++++++-
 5 files changed, 579 insertions(+), 25 deletions(-)

-- 
2.49.0


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