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From: James Clark <jjc@jclark.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alan Stern <stern@rowland.harvard.edu>
Cc: Johan Hovold <johan@kernel.org>,
	Bastien Nocera <hadess@hadess.net>,
	Matthias Kaehlcke <mka@chromium.org>,
	Arnd Bergmann <arnd@arndb.de>,
	Bartosz Golaszewski <bartosz.golaszewski@oss.qualcomm.com>,
	Douglas Anderson <dianders@chromium.org>,
	Robert Nelson <robertcnelson@gmail.com>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-gpio@vger.kernel.org, regressions@lists.linux.dev
Subject: [PATCH v4 0/2] usb: misc: onboard_usb_dev: don't defer probing after the device is configured
Date: Fri,  6 Nov 2026 13:12:49 +0700	[thread overview]
Message-ID: <cover.1793941292.git.jjc@jclark.com> (raw)

On a BeagleY-AI, kernels since commit f918e3804498 ("arm64: enable
HAVE_SHARED_GPIOS for all ARM64 platforms") no longer boot: the on-board
USB hub is re-probed in a loop, because onboard_usb_dev defers probing
after the hub has been configured.

v3 added a pre_probe callback to the USB core, which turned out to add
significant complexity. v4 follows Johan Hovold's other suggestion [1]
instead. Patch 1 exports the generic driver's operations. Patch 2
changes onboard_usb_dev to call them itself instead of setting
generic_subclass.

Tested on the BeagleY-AI on top of v7.4-rc1: the board boots normally,
and unbinding and rebinding the onboard-usb-dev platform device works.

I used an LLM coding assistant to help prepare this series.

[1] https://lore.kernel.org/all/auSdA8MfolA8OhdM@hovoldconsulting.com/

v3: https://lore.kernel.org/all/cover.1793669297.git.jjc@jclark.com/
v2: https://lore.kernel.org/all/20261030151919.3511106-1-jjc@jclark.com/
v1: https://lore.kernel.org/all/20261030114705.3159093-1-jjc@jclark.com/

James Clark (2):
  usb: core: export the generic device driver's operations
  usb: misc: onboard_usb_dev: don't defer probing after the device is
    configured

 drivers/usb/core/generic.c         |  4 ++++
 drivers/usb/core/usb.h             |  6 ------
 drivers/usb/misc/onboard_usb_dev.c | 14 +++++++++++---
 include/linux/usb.h                | 10 +++++++++-
 4 files changed, 24 insertions(+), 10 deletions(-)


base-commit: 6628e7d4c6b25c8d18f1345e3a20d21829aae7e4
-- 
2.56.0


             reply	other threads:[~2026-11-06  6:12 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-11-06  6:12 James Clark [this message]
2026-11-06  6:12 ` [PATCH v4 1/2] usb: core: export the generic device driver's operations James Clark
2026-11-06  6:27   ` sashiko-bot
2026-11-06 17:02   ` Alan Stern
2026-11-06  6:12 ` [PATCH v4 2/2] usb: misc: onboard_usb_dev: don't defer probing after the device is configured James Clark
2026-11-06  6:35   ` sashiko-bot

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