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.cavall...@st.com
Signed-off-by: Peter Griffin peter.grif...@linaro.org
---
Documentation/devicetree/bindings/usb/dwc3-st.txt | 69 +++
1 file changed, 69 insertions(+)
create mode 100644 Documentation/devicetree/bindings/usb/dwc3-st.txt
diff --git a/Documentation/devicetree/bindings/usb/dwc3-st.txt
b/Documentation/devicetree/bindings/usb/dwc3-st.txt
new file mode 100644
index 000..de3fea3
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/dwc3-st.txt
@@ -0,0 +1,69 @@
+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@990 {
+ compatible = snps,dwc3;
+ reg = 0x0990 0x10;
+ interrupts = GIC_SPI 155 IRQ_TYPE_NONE;
+ dr_mode = host
+ usb-phy = usb3_phy;
+ phy-names = usb2-phy;
+ phys= usb2_picophy2;
+ };
+};
--
1.9.1
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