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Date: Wed, 28 Jul 2021 17:29:28 +0800
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Subject: [PATCH v3 0/2] TCPM non-pd mode
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>
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|
| Series |
TCPM non-pd mode
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expand
|
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(-)