linux-kernel - [PATCH v2 0/1] Add USB role switch to tps6598x

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Message-Id: <20200507215938.1983363-1-bryan.odonoghue@linaro.org>
Date:   Thu,  7 May 2020 22:59:37 +0100
From:   Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To:     heikki.krogerus@...ux.intel.com, linux-usb@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        nikolaus.voss@...wensteinmedical.de,
        andriy.shevchenko@...ux.intel.com, garsilva@...eddedor.com,
        keescook@...omium.org,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: [PATCH v2 0/1] Add USB role switch to tps6598x

V2:
- Updates the git commit to include a link to the TI document which
  describes firmware configuration - Andy
- Pads out the description a bit to include information on baking the
  data-role into the firmware with the referenced utility.

V1:
This patch - adds USB role switching to the TI TPS6598x. It has been tested
out with a ChipIdea controller inside a Qualcomm MSM8939.

Right now you need to have configured the TPS firmware with the TI
configuration tool so that the chip knows if it should initiate or accept
data and power role swaps.

https://www.ti.com/lit/an/slva843a/slva843a.pdf

Heikki mentioned that on the ACPI systems the firmware had been
pre-configured to do data/power role swaps. On the hardware I have this is
the case also, which is why I did't invest more time in adding DT bindings
to control data/power roles that I don't need or necessarily support with
the reference hardware.

As-is this code will do role-swappping nicely for me, and I think should be
safe on existing ACPI systems.

Bryan O'Donoghue (1):
  usb: typec: tps6598x: Add USB role switching logic

 drivers/usb/typec/tps6598x.c | 56 +++++++++++++++++++++++++++++++-----
 1 file changed, 49 insertions(+), 7 deletions(-)

-- 
2.25.1