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* [PATCH v10 0/5] USB: misc: Add onboard_usb_hub driver
@ 2021-05-11 22:52 Matthias Kaehlcke
  2021-05-11 22:52 ` [PATCH v10 5/5] arm64: dts: qcom: sc7180-trogdor: Add nodes for onboard USB hub Matthias Kaehlcke
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Matthias Kaehlcke @ 2021-05-11 22:52 UTC (permalink / raw)
  To: Greg Kroah-Hartman, Alan Stern, Rob Herring, Frank Rowand
  Cc: Michal Simek, devicetree, Douglas Anderson, linux-usb,
	Peter Chen, linux-kernel, Stephen Boyd, Ravi Chandra Sadineni,
	Krzysztof Kozlowski, Bastien Nocera, Matthias Kaehlcke,
	Al Cooper, Alexander A. Klimov, Andy Gross, Bjorn Andersson,
	Christian Lamparter, Colin Ian King, Dmitry Osipenko,
	Fabio Estevam, Masahiro Yamada, Mathias Nyman, Vinod Koul,

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

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
  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


^ permalink raw reply	[flat|nested] 6+ messages in thread

end of thread, other threads:[~2021-05-25 17:42 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-11 22:52 [PATCH v10 0/5] USB: misc: Add onboard_usb_hub driver Matthias Kaehlcke
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

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