linux-kernel - [PATCH v3 0/3] usb: usb251xb: support usage case without I2C control

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Message-ID: <20250820161743.23458-1-jszhang@kernel.org>
Date: Thu, 21 Aug 2025 00:17:40 +0800
From: Jisheng Zhang <jszhang@...nel.org>
To: Richard Leitner <richard.leitner@...ux.dev>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>
Cc: linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/3] usb: usb251xb: support usage case without I2C control

Currently, the usb251xb assumes i2c control. But from HW point of
view, the hub supports usage case without any i2c, we only want the
gpio controls.

Refactor the code so that register writes for configuration are only
performed if the device has a i2c_client provided and also register as
a platform driver. This allows the driver to be used to manage GPIO
based control of the device.

Since v2:
 - add usage example w/o i2c control in dt-binding
 - update commit msg
 - remove of_match_ptr

Since v1:
 - make the modern pm macros usage a separate patch
 - use pm_sleep_ptr instead of pm_ptr for usb251xb_plat_pm_ops, because
   this ops is for PM_SLEEP only.

Jisheng Zhang (3):
  dt-bindings: usb: usb251xb: support usage case without I2C control
  usb: usb251xb: use modern PM macros
  usb: usb251xb: support usage case without I2C control

 .../devicetree/bindings/usb/usb251xb.yaml     |   9 +-
 drivers/usb/misc/usb251xb.c                   | 108 +++++++++++++++---
 2 files changed, 102 insertions(+), 15 deletions(-)

-- 
2.50.0