Hi, Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx> writes: > Currently, DWC3 core IP (drivers/usb/dwc3/core.c) > can take only one PHY phandle for each of SS, HS. > (phy-names DT property is "usb2-phy" and "usb3-phy" for each) We never had any other requirements :-) > The DWC3 core IP is provided by Synopsys, > but some SoC-dependent parts (a.k.a glue-layer) > are implemented by SoC venders. > > The number of connected PHY instances are SoC-dependent. > > If you look at generic drivers such as > drivers/usb/host/ehci-platform.c > the driver can handle arbitrary number of PHY instances. > > However, as mentioned above, DWC3 core allows only one PHY phandle > for each SS/HS. > This can result in a strange DT structure. > > For example, Socionext PXs3 SoC is integrated with 2 instances of DWC3. > > The instance 0 of DWC3 is connected with 2 super-speed PHYs. why 2 super-speed phys? Is this a two-port host-only implementation? > The instance 1 of DWC3 is connected with 1 super-speed PHY. Are both of these instances incapable of high/full/low-speed communication? > According to the feed-back from Felipe Balbe, > (https://patchwork.kernel.org/patch/10180167/) > Socionext is trying to split the glue layer into small chunks. > > > The following is the DT under internal review of Socionext. > The full DT is super long, so > here is only snippet for the SS PHY parts. > > > [ instance 0 (with 2 SS PHYs) ] > > dwc3@65a00000 { > compatible = "snps,dwc3"; > reg = <0x65a00000 0xcd00>; > interrupt-names = "host", "peripheral"; > interrupts = <0 134 4>, <0 135 4>; > phy-names = "usb2-phy", "usb3-phy"; > phys = <&usb0_hsphy>, <&usb0_ssphy>; > dr_mode = "host"; > }; > > usb0_ssphy: ss-phy { > compatible = "socionext,uniphier-pxs3-usb3-ssphy"; > #address-cells = <1>; > #size-cells = <0>; > #phy-cells = <0>; > clock-names = "phy-clk0", "phy-clk1"; > clocks = <&sys_clk 17>, <&sys_clk 18>; > reset-names = "phy-rst0", "phy-rst1"; > resets = <&sys_rst 17>, <&sys_rst 18>; > port0-supply = <&usb0_vbus0>; > port1-supply = <&usb0_vbus1>; > > port@0 { > reg = <0>; > }; > port@1 { > reg = <1>; > }; > }; > > [ instance 1 (with 1 SS PHY) ] > > dwc3@65c00000 { > compatible = "snps,dwc3"; > reg = <0x65c00000 0xcd00>; > interrupt-names = "host", "peripheral"; > interrupts = <0 137 4>, <0 138 4>; > phy-names = "usb2-phy", "usb3-phy"; > phys = <&usb1_hsphy>, <&usb1_ssphy>; > dr_mode = "host"; > }; > > usb1_ssphy: ss-phy { > compatible = "socionext,uniphier-pxs3-usb3-ssphy"; > #address-cells = <1>; > #size-cells = <0>; > #phy-cells = <0>; > clock-names = "phy-clk0"; > clocks = <&sys_clk 21>; > reset-names = "phy-rst0"; > resets = <&sys_rst 21>; > port0-supply = <&usb1_vbus0>; > > port@0 { > reg = <0>; > }; > }; > > > I think this is strange, but the PHY driver > counts the number of sub-nodes ("port@0", "port@1" ...) > and iterate the port settings. > > > > > > In my opinion, the structure like follows > will be more natural. > (flattening homogeneous PHY nodes) > > > [ instance 0 (with 2 SS PHYs)] > > dwc3@65a00000 { > compatible = "snps,dwc3"; > reg = <0x65a00000 0xcd00>; > interrupt-names = "host", "peripheral"; > interrupts = <0 134 4>, <0 135 4>; > phys = <&usb0_hsphy>, <&usb0_ssphy0>, <&usb0_ssphy1>; > dr_mode = "host"; > }; > > usb0_ssphy0: ss-phy0@65b00300 { > compatible = "socionext,uniphier-dwc3-ssphy"; > reg = <0x65b00300 0x10>; > #phy-cells = <0>; > clocks = <&sys_clk 17>; > resets = <&sys_rst 17>; > port-supply = <&usb0_vbus0>; > }; > > usb0_ssphy1: ss-phy1@65b00310 { > compatible = "socionext,uniphier-dwc3-ssphy"; > reg = <0x65b00310 0x10>; > #phy-cells = <0>; > clocks = <&sys_clk 18>; > resets = <&sys_rst 18>; > port-supply = <&usb0_vbus1>; > }; > > > > > [ instance 1 (with 1 SS PHY) ] > > usb0: dwc3@65c00000 { > compatible = "snps,dwc3"; > reg = <0x65c00000 0xcd00>; > interrupt-names = "host", "peripheral"; > interrupts = <0 137 4>, <0 138 4>; > phys = <&usb1_hsphy>, <&usb1_ssphy>; > dr_mode = "host"; > }; > > usb1_ssphy: ss-phy@65d00300 { > compatible = "socionext,uniphier-dwc3-ssphy"; > reg = <0x65d00300 0x10>; > #phy-cells = <0>; > clocks = <&sys_clk 21>; > resets = <&sys_rst 21>; > port0-supply = <&usb1_vbus0>; > }; > > > To achieve this, I need driver changes. > > > My proposal is to support arbitrary number of PHY instances > like ehci-platform.c does. > > > > @@ -894,8 +894,8 @@ struct dwc3 { > struct usb_phy *usb2_phy; > struct usb_phy *usb3_phy; > > - struct phy *usb2_generic_phy; > - struct phy *usb3_generic_phy; > + unsigned int num_phys; > + struct phy **phys; > > bool phys_ready; > > > > Is this OK? I don't know, I need a bit more details about your integration :-) -- balbi -- 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
