usb: dwc3: Add dwc3 glue driver support for STi

[u-boot] / doc / device-tree-bindings / usb / dwc3-st.txt

diff --git a/doc/device-tree-bindings/usb/dwc3-st.txt b/doc/device-tree-bindings/usb/dwc3-st.txt
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+ST DWC3 glue logic
+
+This file documents the parameters for the dwc3-st driver.
+This driver controls the glue logic used to configure the dwc3 core on
+STiH407 based platforms.
+
+Required properties:
+ - compatible  : must be "st,stih407-dwc3"
+ - reg         : glue logic base address and USB syscfg ctrl register offset
+ - reg-names   : should be "reg-glue" and "syscfg-reg"
+ - st,syscon   : should be phandle to system configuration node which
+                 encompasses the glue registers
+ - resets      : list of phandle and reset specifier pairs. There should be two entries, one
+                 for the powerdown and softreset lines of the usb3 IP
+ - reset-names : list of reset signal names. Names should be "powerdown" and "softreset"
+
+ - #address-cells, #size-cells : should be '1' if the device has sub-nodes
+   with 'reg' property
+
+ - pinctl-names        : A pinctrl state named "default" must be defined
+
+ - pinctrl-0   : Pin control group
+
+ - ranges      : allows valid 1:1 translation between child's address space and
+                 parent's address space
+
+Sub-nodes:
+The dwc3 core should be added as subnode to ST DWC3 glue as shown in the
+example below.
+
+NB: The dr_mode property is NOT optional for this driver, as the default value
+is "otg", which isn't supported by this SoC. Valid dr_mode values for dwc3-st are
+either "host" or "device".
+
+Example:
+
+st_dwc3: dwc3@8f94000 {
+       status          = "disabled";
+       compatible      = "st,stih407-dwc3";
+       reg             = <0x08f94000 0x1000>, <0x110 0x4>;
+       reg-names       = "reg-glue", "syscfg-reg";
+       st,syscfg       = <&syscfg_core>;
+       resets          = <&powerdown STIH407_USB3_POWERDOWN>,
+                         <&softreset STIH407_MIPHY2_SOFTRESET>;
+       reset-names     = "powerdown", "softreset";
+       #address-cells  = <1>;
+       #size-cells     = <1>;
+       pinctrl-names   = "default";
+       pinctrl-0       = <&pinctrl_usb3>;
+       ranges;
+
+       dwc3: dwc3@9900000 {
+               compatible      = "snps,dwc3";
+               reg             = <0x09900000 0x100000>;
+               interrupts      = <GIC_SPI 155 IRQ_TYPE_NONE>;
+               dr_mode         = "host";
+               phy-names       = "usb2-phy", "usb3-phy";
+               phys            = <&usb2_picophy2>, <&phy_port2 PHY_TYPE_USB3>;
+       };
+};