linux-kernel - [PATCH v2 0/2] usb: typec: Add new driver for Parade PS8830 Type-C Retimer

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Message-Id: <20241004-x1e80100-ps8830-v2-0-5cd8008c8c40@linaro.org>
Date: Fri, 04 Oct 2024 16:57:36 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, 
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Rajendra Nayak <quic_rjendra@...cinc.com>, 
 Sibi Sankar <quic_sibis@...cinc.com>, Johan Hovold <johan@...nel.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Trilok Soni <quic_tsoni@...cinc.com>, linux-kernel@...r.kernel.org, 
 linux-usb@...r.kernel.org, devicetree@...r.kernel.org, 
 Abel Vesa <abel.vesa@...aro.org>
Subject: [PATCH v2 0/2] usb: typec: Add new driver for Parade PS8830 Type-C
 Retimer

The Parade PS8830 is a Type-C multi-protocol retimer that is controlled
via I2C. It provides altmode and orientation handling and usually sits
between the Type-C port and the PHY.

It is currently used alongside Qualcomm Snapdragon X Elite SoCs on quite
a few laptops already.

This new driver adds support for the following 3 modes:
 - DP 4lanes (pin assignments C and E)
 - DP 2lanes + USB3 (pin assignment D)
 - USB3

This retimer is a LTTPR (Link-Training Tunable PHY Repeater) which means
it can support link training from source to itself. This means that the
DP driver needs to be aware of the repeater presence and to handle
the link training accordingly. This is currently missing from msm dp
driver, but there is already effort going on to add it. Once done,
full external DP will be working on all X1E laptops that make use of
this retimer.

Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
---
Changes in v2:
- Addressed all comments from Johan and Konrad.
- Reworked the handling of the vregs so it would be more cleaner.
  Dropped the usage of bulk regulators API and handled them separately.
  Also discribed all regulators according to data sheet.
- Added all delays according to data sheet.
- Fixed coldplug (on boot) orientation detection.
- Didn't pick Krzysztof's R-b tag because the bindings changed w.r.t
  supplies.
- Link to v1: https://lore.kernel.org/r/20240829-x1e80100-ps8830-v1-0-bcc4790b1d45@linaro.org

---
Abel Vesa (2):
      dt-bindings: usb: Add Parade PS8830 Type-C retimer bindings
      usb: typec: Add support for Parade PS8830 Type-C Retimer

 .../devicetree/bindings/usb/parade,ps8830.yaml     | 129 +++++++
 drivers/usb/typec/mux/Kconfig                      |  10 +
 drivers/usb/typec/mux/Makefile                     |   1 +
 drivers/usb/typec/mux/ps8830.c                     | 424 +++++++++++++++++++++
 4 files changed, 564 insertions(+)
---
base-commit: c02d24a5af66a9806922391493205a344749f2c4
change-id: 20240521-x1e80100-ps8830-d5ccca95b557

Best regards,
-- 
Abel Vesa <abel.vesa@...aro.org>