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 v3 0/2] TCPM non-pd mode
Date: Wed, 28 Jul 2021 17:29:28 +0800 [thread overview]
Message-ID: <20210728092930.2552619-1-kyletso@google.com> (raw)
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 as
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 v2:
- Negated the meaning and the name of the dt property. Now the name is
"pd-unsupported"
- Changed the control flow if the port is SNK or DRP. Return directly if
the flag is false (PD not supported). Read "self-powered" before that.
---
cover-letter in v2:
---
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-supported" is introduced and TCPM uses this
property as a flag to decide whether PD is supported. If the flag is
false, 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 as what it was before.
If "pd-supported" is not 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 v1:
- revise the patch to use dt properties
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 | 88 +++++++++++++++----
2 files changed, 74 insertions(+), 18 deletions(-)
--
2.32.0.432.gabb21c7263-goog
next reply other threads:[~2021-07-28 9:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 9:29 Kyle Tso [this message]
2021-07-28 9:29 ` [PATCH v3 1/2] dt-bindings: connector: Add pd-supported property Kyle Tso
2021-07-28 14:04 ` Guenter Roeck
2021-07-28 9:29 ` [PATCH v3 2/2] usb: typec: tcpm: Support non-PD mode Kyle Tso
2021-07-28 14:31 ` Guenter Roeck
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