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Fri, 13 Aug 2021 12:52:34 -0700 (PDT) From: Matthias Kaehlcke To: Greg Kroah-Hartman , Alan Stern , Rob Herring , Frank Rowand , Mathias Nyman , Felipe Balbi Cc: devicetree@vger.kernel.org, Peter Chen , linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Bastien Nocera , Ravi Chandra Sadineni , Michal Simek , Douglas Anderson , Roger Quadros , Krzysztof Kozlowski , Stephen Boyd , Matthias Kaehlcke , Al Cooper , Al Viro , Alexandre Belloni , Alexandre Torgue , Andrew Lunn , Andrey Zhizhikin , Andy Gross , Arnd Bergmann , Aswath Govindraju , Bjorn Andersson , Catalin Marinas , Dmitry Baryshkov , Dmitry Osipenko , Dong Aisheng , Enric Balletbo i Serra , Fabio Estevam , Fabrice Gasnier , Florian Fainelli , Gregory Clement , Grygorii Strashko , =?utf-8?q?Guido_G=C3=BCnther?= , Jagan Teki , Jens Axboe , Johan Hovold , Krzysztof Kozlowski , Lad Prabhakar , Lionel Debieve , Manivannan Sadhasivam , Marek Szyprowski , Mark Brown , =?utf-8?q?Martin_J=C3=BCcker?= , Nishanth Menon , Olivier Moysan , Pawel Laszczak , Robert Richter , Russell King , Sebastian Hesselbarth , Shawn Guo , Thomas Gleixner , Tony Lindgren , Vinod Koul , Viresh Kumar , Will Deacon , William Cohen , linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, linux-omap@vger.kernel.org, linux-samsung-soc@vger.kernel.org, =?utf-8?q?=C5=81ukasz_Stelmach?= Subject: [PATCH v16 0/7] usb: misc: Add onboard_usb_hub driver Date: Fri, 13 Aug 2021 12:52:21 -0700 Message-Id: <20210813195228.2003500-1-mka@chromium.org> X-Mailer: git-send-email 2.33.0.rc1.237.g0d66db33f3-goog MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org 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 v16: - added patch 'ARM: configs: Explicitly enable USB_XHCI_PLATFORM where needed' to keep arm32 defconfigs effectively unchanged 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 (7): usb: misc: Add onboard_usb_hub driver of/platform: Add stubs for of_platform_device_create/destroy() ARM: configs: Explicitly enable USB_XHCI_PLATFORM where needed 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 + arch/arm/configs/exynos_defconfig | 1 + arch/arm/configs/keystone_defconfig | 1 + arch/arm/configs/multi_v7_defconfig | 1 + arch/arm/configs/mvebu_v7_defconfig | 1 + arch/arm/configs/omap2plus_defconfig | 1 + arch/arm/configs/pxa_defconfig | 1 + .../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 + 23 files changed, 627 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