usb: typec: tps6598x: Add USB role switching logic

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This patch adds USB role switch support to the tps6598x.

The setup to initiate or accept a data-role switch is both assumed and
currently required to be baked-into the firmware as described in TI's
document here.

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

With this change its possible to use the USB role-switch API to detect and
notify role-switches to downstream consumers.

Tested with a ChipIdea controller on a Qualcomm MSM8939.

Cc: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Gustavo A. R. Silva <garsilva@embeddedor.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: linux-usb@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20200511231930.2825183-2-bryan.odonoghue@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Bryan O'Donoghue 2020-05-12 00:19:30 +01:00 • committed by Greg Kroah-Hartman

parent 0ef1f6e380

commit 18a6c866bb

1 changed files with 50 additions and 7 deletions

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drivers/usb/typec/tps6598x.c

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