usb: dwc3: dwc3-st: Add st-dwc3 devicetree bindings documentation

This patch documents the device tree documentation required for
the ST usb3 controller glue layer found in STiH407 devices.

Signed-off-by: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Felipe Balbi <balbi@ti.com>

diff --git a/Documentation/devicetree/bindings/usb/dwc3-st.txt b/Documentation/devicetree/bindings/usb/dwc3-st.txt
new file mode 100644 (file)
index 0000000..f9d7025
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/dwc3-st.txt
@@ -0,0 +1,68 @@
+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"
+See: Documentation/devicetree/bindings/reset/st,sti-powerdown.txt
+See: Documentation/devicetree/bindings/reset/reset.txt
+
+ - #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
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
+
+ - pinctrl-0   : Pin control group
+See: Documentation/devicetree/bindings/pinctrl/pinctrl-binding.txt
+
+ - 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. The DT binding details of dwc3 can be found in:
+Documentation/devicetree/bindings/usb/dwc3.txt
+
+NB: The dr_mode property described in [1] 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".
+
+[1] Documentation/devicetree/bindings/usb/generic.txt
+
+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";
+               phys-names      = "usb2-phy", "usb3-phy";
+               phys            = <&usb2_picophy2>, <&phy_port2 MIPHY_TYPE_USB>;
+       };
+};