usb: typec: tcpm: Add support for sink-bc12-completion-time-ms DT property

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Add support for parsing DT time property "sink-bc12-completion-time-ms".
This timer is used to relax the PD state machine during Sink attach to
allow completion of Battery Charging (BC1.2) charger type detection in
TCPC before PD negotiations. BC1.2 detection is a hardware mechanism to
detect charger port type that is run by some controllers (such as
"maxim,max33359") in parallel to Type-C connection state machines.
This is to ensure that BC1.2 completes before PD is enabled as running
BC1.2 in parallel with PD negotiation results in delays violating timer
constraints in PD spec.

This is an optional timer and will not add any delay unless explicitly
set.

Signed-off-by: Amit Sunil Dhamne <amitsd@google.com>
Reviewed-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20241103034402.2460252-4-amitsd@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Amit Sunil Dhamne 2024-11-02 20:43:30 -07:00 • committed by Greg Kroah-Hartman

parent 3b9d67e7e9

commit 237d4e0f41

1 changed files with 15 additions and 1 deletions

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drivers/usb/typec/tcpm/tcpm.c

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