linux-kernel - [RFC v4 0/2] Add support for time DT property in TCPM

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Message-ID: <20240925031135.1101048-1-amitsd@google.com>
Date: Tue, 24 Sep 2024 20:11:29 -0700
From: Amit Sunil Dhamne <amitsd@...gle.com>
To: gregkh@...uxfoundation.org, robh@...nel.org, dmitry.baryshkov@...aro.org, 
	heikki.krogerus@...ux.intel.com
Cc: badhri@...gle.com, kyletso@...gle.com, rdbabiera@...gle.com, 
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org, 
	devicetree@...r.kernel.org, Amit Sunil Dhamne <amitsd@...gle.com>
Subject: [RFC v4 0/2]  Add support for time DT property in TCPM

USB PD specification defines a bunch of timers that can have a range of
acceptable values instead of specific values. These values have to be
tuned based on the platform. However, TCPM currently sets them to a
default value without providing a mechanism to set platform specific
values.

This patchset adds new DT properties per timer to allow users to define
platform specific values.

Changes compared to v3:
  - nit: removed an extra newline that got added in tcpm_register_port()

Changes compared to v2:
  - Added min, max & default values to DT property in Documentation.
  - Changed return type of tcpm_fw_get_timings to void instead of int.

Changes compared to v1:
  - Defined new properties per timer that we are interested in rather
    than defining a single pd-timers u32 array property.
  - Better description of the timer properties.
  - Since subject has changed, adding link for previous patchset for
    posterity:
    https://lore.kernel.org/all/20240911000715.554184-1-amitsd@google.com/

Amit Sunil Dhamne (2):
  dt-bindings: connector: Add properties to define time values
  usb: typec: tcpm: Add support for parsing time dt properties

 .../bindings/connector/usb-connector.yaml     | 35 ++++++++-
 drivers/usb/typec/tcpm/tcpm.c                 | 73 +++++++++++++++----
 2 files changed, 91 insertions(+), 17 deletions(-)


base-commit: 68d4209158f43a558c5553ea95ab0c8975eab18c
-- 
2.46.0.792.g87dc391469-goog