The state of USB ChipIdea support on Qualcomm's platforms is not great. The DT description of these devices requires up to three different nodes for what amounts to be the same hardware block, when there should really only be one. Furthermore, the "phy" driver that is in mainline (phy-msm-usb.c) duplicates the OTG state machine and touches the ci controller wrapper registers when it should really be focused on the phy and the ULPI accesses needed to get the phy working. There's also a slimmed down phy driver for the msm8916 platform, but really the phy hardware is the same as other MSMs, so we have two drivers doing pretty much the same thing. This leads to a situtaion where we have the chipidea core driver, the "phy" driver, and sometimes the ehci-msm.c driver operating the same device all at the same time with very little coordination. This just isn't very safe and is confusing from a driver perspective when trying to figure out who does what. Finally, there isn't any HSIC support on platforms like apq8074 so we should add that. This patch series updates the ChipIdea driver and the MSM wrapper (ci_hdrc_msm.c) to properly handle the PHY and wrapper bits at the right times in the right places. To get there, we update the ChipIdea core to have support for the ULPI phy bus introduced by Heikki. Along the way we fix bugs with the extcon handling for peripheral and OTG mode controllers and move the parts of phy-usb-msm.c that are touching the CI controller wrapper into the wrapper driver (ci_hdrc_msm.c). Finally we add support for the HSIC phy based on the ULPI bus and rewrite the HS phy driver (phy-usb-msm.c) as a standard ULPI phy driver. Once this series is accepted, we should be able to delete the phy-usb-msm.c, phy-qcom-8x16-usb.c, and ehci-msm.c drivers from the tree and use the ULPI based phy driver (which also lives in drivers/phy/ instead of drivers/usb/phy/) and the chipidea host core instead. I've also sent separate patches for other minor pieces to make this all work. The full tree can be found here[3], hacks and all to get things working. I've tested this on the db410c, apq8074 dragonboard, and ifc6410 with configfs gadgets and otg cables. Changes from v1: * Reworked ULPI device probing to keep using vendor/product ids that come from DT if needed and falls back to OF style match when product id is 0 * PHY init later patch was rejected so that moved to a quirk flag and the msm wrapper started managing the phy on/off * Updated clk requirements for HSIC phy in binding doc * Added optional clk in wrapper for "housekeeping" found on older qcom platforms * Bug fix to otgsc polling function * Changed runtime PM patch to set as active instead of get/put TODO: * DMA fails on arm64 so we need something like [1] to make it work. * The db410c needs a driver to toggle the onboard switch to connect the usb hub instead of micro port when the usb cable is disconnected * apq8064 platforms need a vbus regulator to really use otg and I haven't tried out the RPM based regulators yet * The HSIC phy on the apq8074 dragonboard is connected to a usb4604 device which requires the i2c driver to probe and send an i2c sequence before the HSIC controller enumerates or HSIC doesn't work. Right now I have a hack to force the controller to probe defer once so that usb4604 probes first. This needs a more proper solution like having the DT describe a linkage between the controller and the usb device so we can enforce probe ordering. * OTG support requires a working VBUS supply on apq8074 dragonboard and that requires changes to the smbb_charger driver to support the OTG OVP switch as a regulator[2]. This series needs revival on the list so that OTG works properly on that board. [1] https://lkml.org/lkml/2016/2/22/7 [2] http://lkml.kernel.org/g/1449621618-11900-1-git-send-email-tim.bird@xxxxxxxxxxxxxx [3] https://git.linaro.org/people/stephen.boyd/linux.git/shortlog/refs/heads/usb-hsic-8074 Stephen Boyd (22): of: device: Support loading a module with OF based modalias of: device: Export of_device_{get_modalias,uvent_modalias} to modules usb: ulpi: Support device discovery via device properties usb: chipidea: Only read/write OTGSC from one place usb: chipidea: Handle extcon events properly usb: chipidea: Add platform flag for wrapper phy management usb: chipidea: Notify events when switching host mode usb: chipidea: Remove locking in ci_udc_start() usb: chipidea: Kick OTG state machine for AVVIS with vbus extcon usb: chipidea: Add support for ULPI PHY bus usb: chipidea: msm: Mark device as runtime pm active usb: chipidea: msm: Rely on core to override AHBBURST usb: chipidea: msm: Use hw_write_id_reg() instead of writel usb: chipidea: msm: Add proper clk and reset support usb: chipidea: msm: Mux over secondary phy at the right time usb: chipidea: msm: Restore wrapper settings after reset usb: chipidea: msm: Make platform data driver local instead of global usb: chipidea: msm: Add reset controller for PHY POR bit usb: chipidea: msm: Handle phy power states usb: chipidea: msm: Be silent on probe defer errors phy: Add support for Qualcomm's USB HSIC phy phy: Add support for Qualcomm's USB HS phy .../devicetree/bindings/phy/qcom,usb-hs-phy.txt | 83 ++++++ .../devicetree/bindings/phy/qcom,usb-hsic-phy.txt | 72 +++++ Documentation/devicetree/bindings/usb/ulpi.txt | 35 +++ drivers/of/device.c | 25 ++ drivers/phy/Kconfig | 15 ++ drivers/phy/Makefile | 2 + drivers/phy/phy-qcom-usb-hs.c | 295 +++++++++++++++++++++ drivers/phy/phy-qcom-usb-hsic.c | 167 ++++++++++++ drivers/usb/chipidea/Kconfig | 8 + drivers/usb/chipidea/Makefile | 1 + drivers/usb/chipidea/ci.h | 23 +- drivers/usb/chipidea/ci_hdrc_msm.c | 275 ++++++++++++++++--- drivers/usb/chipidea/core.c | 77 +++--- drivers/usb/chipidea/host.c | 10 + drivers/usb/chipidea/otg.c | 80 +++++- drivers/usb/chipidea/otg_fsm.c | 17 ++ drivers/usb/chipidea/udc.c | 3 - drivers/usb/chipidea/ulpi.c | 113 ++++++++ drivers/usb/common/ulpi.c | 74 +++++- include/linux/of_device.h | 6 + include/linux/usb/chipidea.h | 5 +- 21 files changed, 1290 insertions(+), 96 deletions(-) create mode 100644 Documentation/devicetree/bindings/phy/qcom,usb-hs-phy.txt create mode 100644 Documentation/devicetree/bindings/phy/qcom,usb-hsic-phy.txt create mode 100644 Documentation/devicetree/bindings/usb/ulpi.txt create mode 100644 drivers/phy/phy-qcom-usb-hs.c create mode 100644 drivers/phy/phy-qcom-usb-hsic.c create mode 100644 drivers/usb/chipidea/ulpi.c -- 2.9.0.rc2.8.ga28705d -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
