linux-arm-msm.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Matthias Kaehlcke <mka@chromium.org>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	Rob Herring <robh+dt@kernel.org>,
	Frank Rowand <frowand.list@gmail.com>
Cc: Michal Simek <michal.simek@xilinx.com>,
	devicetree@vger.kernel.org,
	Douglas Anderson <dianders@chromium.org>,
	linux-usb@vger.kernel.org, Peter Chen <peter.chen@kernel.org>,
	linux-kernel@vger.kernel.org, Stephen Boyd <swboyd@chromium.org>,
	Ravi Chandra Sadineni <ravisadineni@chromium.org>,
	Krzysztof Kozlowski <krzk@kernel.org>,
	Bastien Nocera <hadess@hadess.net>,
	Matthias Kaehlcke <mka@chromium.org>,
	Al Cooper <alcooperx@gmail.com>,
	"Alexander A. Klimov" <grandmaster@al2klimov.de>,
	Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Christian Lamparter <chunkeey@googlemail.com>,
	Colin Ian King <colin.king@canonical.com>,
	Dmitry Osipenko <digetx@gmail.com>,
	Fabio Estevam <festevam@gmail.com>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Mathias Nyman <mathias.nyman@intel.com>,
	Vinod Koul <vkoul@kernel.org>,
	linux-arm-msm@vger.kernel.org
Subject: [PATCH v10 0/5] USB: misc: Add onboard_usb_hub driver
Date: Tue, 11 May 2021 15:52:18 -0700	[thread overview]
Message-ID: <20210511225223.550762-1-mka@chromium.org> (raw)

This series adds:
- the onboard_usb_hub_driver
- glue in the xhci-plat driver to create the onboard_usb_hub
  platform device if needed
- a device tree binding for the Realtek RTS5411 USB hub controller
- device tree changes that add RTS5411 entries for the QCA SC7180
  based boards trogdor and lazor
- a couple of stubs for platform device functions to avoid
  unresolved symbols with certain kernel configs

The main issue the driver addresses is that a USB hub needs to be
powered before it can be discovered. For discrete onboard hubs (an
example for such a hub is the Realtek RTS5411) this is often solved
by supplying the hub with an 'always-on' regulator, which is kind
of a hack. Some onboard hubs may require further initialization
steps, like changing the state of a GPIO or enabling a clock, which
requires even more hacks. This driver creates a platform device
representing the hub which performs the necessary initialization.
Currently it only supports switching on a single regulator, support
for multiple regulators or other actions can be added as needed.
Different initialization sequences can be supported based on the
compatible string.

Besides performing the initialization the driver can be configured
to power the hub off during system suspend. This can help to extend
battery life on battery powered devices which have no requirements
to keep the hub powered during suspend. The driver can also be
configured to leave the hub powered when a wakeup capable USB device
is connected when suspending, and power it off otherwise.

Changes in v10:
- always use of_is_onboard_usb_hub() stub unless ONBOARD_USB_HUB=y/m
- keep 'regulator-boot-on' property for pp3300_hub

Changes in v9:
- added dependency on ONBOARD_USB_HUB (or !!ONBOARD_USB_HUB) to
  USB_PLATFORM_XHCI

Changes in v7:
- updated DT binding
- series rebased on qcom/arm64-for-5.13

Changes in v6:
- updated summary

Changes in v5:
- cover letter added

Matthias Kaehlcke (5):
  dt-bindings: usb: Add binding for Realtek RTS5411 hub controller
  USB: misc: Add onboard_usb_hub driver
  of/platform: Add stubs for of_platform_device_create/destroy()
  usb: host: xhci-plat: Create platform device for onboard hubs in
    probe()
  arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub

 .../sysfs-bus-platform-onboard-usb-hub        |   8 +
 .../bindings/usb/realtek,rts5411.yaml         |  62 +++
 MAINTAINERS                                   |   7 +
 .../boot/dts/qcom/sc7180-trogdor-lazor-r0.dts |  19 +-
 .../boot/dts/qcom/sc7180-trogdor-lazor-r1.dts |  11 +-
 .../arm64/boot/dts/qcom/sc7180-trogdor-r1.dts |  19 +-
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi  |  19 +-
 drivers/usb/host/Kconfig                      |   1 +
 drivers/usb/host/xhci-plat.c                  |  16 +
 drivers/usb/misc/Kconfig                      |  17 +
 drivers/usb/misc/Makefile                     |   1 +
 drivers/usb/misc/onboard_usb_hub.c            | 415 ++++++++++++++++++
 include/linux/of_platform.h                   |  22 +-
 include/linux/usb/hcd.h                       |   2 +
 include/linux/usb/onboard_hub.h               |  15 +
 15 files changed, 600 insertions(+), 34 deletions(-)
 create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub
 create mode 100644 Documentation/devicetree/bindings/usb/realtek,rts5411.yaml
 create mode 100644 drivers/usb/misc/onboard_usb_hub.c
 create mode 100644 include/linux/usb/onboard_hub.h

-- 
2.31.1.607.g51e8a6a459-goog


             reply	other threads:[~2021-05-11 22:52 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-11 22:52 Matthias Kaehlcke [this message]
2021-05-11 22:52 ` [PATCH v10 5/5] arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub Matthias Kaehlcke
2021-05-12  7:19 ` [PATCH v10 0/5] USB: misc: Add onboard_usb_hub driver Alexander Dahl
2021-05-12 16:37   ` Matthias Kaehlcke
2021-05-21 12:30 ` Greg Kroah-Hartman
2021-05-25 17:42   ` Matthias Kaehlcke

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210511225223.550762-1-mka@chromium.org \
    --to=mka@chromium.org \
    --cc=agross@kernel.org \
    --cc=alcooperx@gmail.com \
    --cc=bjorn.andersson@linaro.org \
    --cc=chunkeey@googlemail.com \
    --cc=colin.king@canonical.com \
    --cc=devicetree@vger.kernel.org \
    --cc=dianders@chromium.org \
    --cc=digetx@gmail.com \
    --cc=festevam@gmail.com \
    --cc=frowand.list@gmail.com \
    --cc=grandmaster@al2klimov.de \
    --cc=gregkh@linuxfoundation.org \
    --cc=hadess@hadess.net \
    --cc=krzk@kernel.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=masahiroy@kernel.org \
    --cc=mathias.nyman@intel.com \
    --cc=michal.simek@xilinx.com \
    --cc=peter.chen@kernel.org \
    --cc=ravisadineni@chromium.org \
    --cc=robh+dt@kernel.org \
    --cc=stern@rowland.harvard.edu \
    --cc=swboyd@chromium.org \
    --cc=vkoul@kernel.org \
    --subject='Re: [PATCH v10 0/5] USB: misc: Add onboard_usb_hub driver' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).