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 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 (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 | 12 +-
.../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 | 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 +
15 files changed, 676 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
--
2.32.0.rc1.229.g3e70b5a671-goog
