Hello Greg, Hello Mathias, On Mon, Sep 18, 2017 at 10:49 AM, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> wrote: > On Sun, Sep 17, 2017 at 10:51:31PM +0200, Martin Blumenstingl wrote: >> Hello Mathias, Hello Greg, >> >> On Sun, Sep 3, 2017 at 11:38 PM, Martin Blumenstingl >> <martin.blumenstingl@xxxxxxxxxxxxxx> wrote: >> > This series is the outcome of a discussion with Felipe Balbi, >> > see [0] and [1]. >> > The quick-summary of this is: >> > - dwc3 already takes one USB2 and one USB3 PHY and initializes these >> > correct >> > - some other HCI platform drivers (like ehci-platform.c, xhci-mtk.c and >> > ohci-platform.c) do not have a limitation on the number of PHYs - they >> > support one PHY per actual host port >> > - Amlogic Meson GXL and GXM SoCs come with a dwc3 IP block which has two >> > or three USB2 ports enabled on the internal root-hub. The SoCs also >> > provide separate USB2 PHYs, one per port. All USB2 PHYs (which are >> > internally "connected" to the dwc3 roothub) need to be powered on, >> > otherwise USB devices cannot be enumerated (even if just one PHY is >> > disabled and if the device is plugged into another, enabled port) >> > >> > In my first attempt to get USB supported on the GXL and GXM SoCs I tried >> > to work-around the problem that I could not pass multiple PHYs to the >> > dwc3 controller. >> > This was rejected by Rob Herring (which was definitely the thing to do in >> > my opinion), see [2] >> > >> > This series adds a new "platform-roothub". This can be configured through >> > devicetree by passing a child-node with "reg = <0>" to the USB >> > controller. Additionally there has to be a child-node for each port on >> > the root-hub. Each of the child-nodes takes a "phys" and "phy-names" >> > property. This allows modeling the root-hub in devicetree similar to the >> > USB device binding (documented in devicetree/bindings/usb/usb-device.txt) >> > This avoids and backwards-compatibility problems (which was a concern >> > regardless of the solution, see [3]) since the binding for the root-hub >> > was previously not specified (and we're not using the "phys" property of >> > the controller, which might have served different purposes before, >> > depending on the drivers). >> > >> > Additionally this integrates the new platform-roothub into xhci-plat.c >> > which automatically enables it for the dwc3 driver (in host-mode). >> > >> > >> > Changes since RFCv3 at [6]: >> > - moved the DT binding change from patch #3 to patch #1 as suggested >> > by Rob Herring (and slightly adjusted the commit message to account >> > for that) >> > - added Tested-by from Chunfeng Yun (who confirmed that the whole >> > concept and implementation works fine on Mediatek SoCs - many thanks >> > again!) to patch #2 >> > - added Rob Herring's ACK to patches 1 and 3 >> > - dropped RFC status (RFCv3 -> PATCH v4) >> I just wanted to rebase this to v4.14-rc1 (now that this is out) - >> however I noticed that v4 still applies to v4.14-rc1 cleanly (the >> patches are still identical to v4 after rebasing). >> >> we have an ACK from the devicetree maintainers and a "Tested-by" for a >> Mediatek (= non-Amlogic) SoC. >> I already have patches for the Amlogic GXL/GXM platforms queued, those >> are just waiting on this series. >> >> what is still missing to get this series into v4.15? > > Well, we couldn't do anything until 4.14-rc1 is out, now that it is, let > us catch up on patch review please... OK, I understand that. please let me know once you've caught up with the review backlog - as I said I would like to get this into 4.15 if nothing else comes up during the code-review Thank you! Regards, Martin -- 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
