lkml.org 
[lkml]   [2021]   [Jul]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Subject[PATCH v15 0/6] usb: misc: Add onboard_usb_hub driver
    Date
    This series adds:
    - the onboard_usb_hub_driver
    - glue in the xhci-plat driver to create and destroy the
    onboard_usb_hub platform devices 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 v15:
    - adjusted dependencies of USB_DWC3_CORE to make sure it can only
    be enabled when at least one of USB_DWC3_HOST, USB_DWC3_GADGET
    or USB_DWC3_DUAL_ROLE is selectable

    Changes in v14:
    - rebased on top of v5.14-rc1
    - dropped DT binding patch which landed in v5.13

    Changes in v13:
    - added patch "usb: Specify dependency on USB_XHCI_PLATFORM with
    'depends on'" to the series to avoid Kconfig conflicts
    - added patch "arm64: defconfig: Explicitly enable USB_XHCI_PLATFORM"
    to the series to keep effective defconfig unchanged

    Changes in v12:
    - onboard_hub driver: use IS_ENABLED(CONFIG_USB_ONBOARD_HUB_MODULE)
    in onboard_hub.h to also check for the driver built as module
    - onboard_hub_driver: include onboard_hub.h again to make sure there
    are prototype declarations for the public functions

    Changes in v11:
    - support multiple onboard hubs connected to the same parent
    - don't include ‘onboard_hub.h’ from the onboard hub driver

    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 (6):
    usb: misc: Add onboard_usb_hub driver
    of/platform: Add stubs for of_platform_device_create/destroy()
    arm64: defconfig: Explicitly enable USB_XHCI_PLATFORM
    usb: Specify dependencies on USB_XHCI_PLATFORM with 'depends on'
    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 +
    MAINTAINERS | 7 +
    .../boot/dts/qcom/sc7180-trogdor-lazor-r0.dts | 19 +-
    .../boot/dts/qcom/sc7180-trogdor-lazor-r1.dts | 12 +-
    .../arm64/boot/dts/qcom/sc7180-trogdor-r1.dts | 19 +-
    arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 19 +-
    arch/arm64/configs/defconfig | 1 +
    drivers/usb/cdns3/Kconfig | 2 +-
    drivers/usb/dwc3/Kconfig | 5 +-
    drivers/usb/host/Kconfig | 5 +-
    drivers/usb/host/xhci-plat.c | 6 +
    drivers/usb/host/xhci.h | 2 +
    drivers/usb/misc/Kconfig | 17 +
    drivers/usb/misc/Makefile | 1 +
    drivers/usb/misc/onboard_usb_hub.c | 497 ++++++++++++++++++
    include/linux/of_platform.h | 22 +-
    include/linux/usb/onboard_hub.h | 18 +
    17 files changed, 621 insertions(+), 39 deletions(-)
    create mode 100644 Documentation/ABI/testing/sysfs-bus-platform-onboard-usb-hub
    create mode 100644 drivers/usb/misc/onboard_usb_hub.c
    create mode 100644 include/linux/usb/onboard_hub.h

    --
    2.32.0.432.gabb21c7263-goog

    \
     
     \ /
      Last update: 2021-07-27 02:41    [W:5.729 / U:0.352 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site