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From: Kyle Tso <kyletso@google.com>
To: linux@roeck-us.net, heikki.krogerus@linux.intel.com,
	gregkh@linuxfoundation.org, robh+dt@kernel.org
Cc: badhri@google.com, linux-usb@vger.kernel.org,
	linux-kernel@vger.kernel.org, devicetree@vger.kernel.org,
	Kyle Tso <kyletso@google.com>
Subject: [PATCH v4 0/2] TCPM non-PD mode
Date: Fri, 30 Jul 2021 14:18:30 +0800	[thread overview]
Message-ID: <20210730061832.1927936-1-kyletso@google.com> (raw)

cover-letter is the same as that in v3

The reason for this patch is to let the device/system policy decide
whether PD is going to be supported using devicetree properties.

A new dt property "pd-unsupported" is introduced and TCPM uses this
property as a flag to decide whether PD is supported. If the flag is
false (the dt property is not present), the RX functionality of the
low-level driver will not be enabled. The power negotiation related
states will be skipped as well. If the flag is true, everything is a
what it was before.

If "pd-unsupported" is present, and the port is SRC or DRP, another
existing dt property "typec-power-opmode" needs to be specified to
indicate which Rp value should be used when the port is SRC.

changes since v3:

usb: typec: tcpm: Support non-PD mode
- commit msg updated
- removed unnecessary empty lines
- re-factored the code of reading device tree properties and the error
  handling
- removed unnecessay variable initialization
- modified the comments

Kyle Tso (2):
  dt-bindings: connector: Add pd-supported property
  usb: typec: tcpm: Support non-PD mode

 .../bindings/connector/usb-connector.yaml     |  4 +
 drivers/usb/typec/tcpm/tcpm.c                 | 87 +++++++++++++++----
 2 files changed, 72 insertions(+), 19 deletions(-)

-- 
2.32.0.554.ge1b32706d8-goog


             reply	other threads:[~2021-07-30  6:18 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-30  6:18 Kyle Tso [this message]
2021-07-30  6:18 ` [PATCH v4 1/2] dt-bindings: connector: Add pd-supported property Kyle Tso
2021-07-30  6:29   ` Guenter Roeck
2021-08-03 19:33     ` Rob Herring
2021-08-03 19:35       ` Rob Herring
2021-08-03 19:37   ` Rob Herring
2021-07-30  6:18 ` [PATCH v4 2/2] usb: typec: tcpm: Support non-PD mode Kyle Tso
2021-07-30  6:31   ` Guenter Roeck

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