usb: common: introduce of_usb_get_maximum_speed()

this helper will be used for controllers which
want to work at a lower speed even though they
support higher USB transfer rates.

One such case is Texas Instruments' AM437x
SoC where it uses a USB3 controller without
a USB3 PHY, rendering the controller USB2-only.

Signed-off-by: Felipe Balbi <balbi@ti.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/usb/generic.txt b/Documentation/devicetree/bindings/usb/generic.txt
new file mode 100644
index 000000000000..477d5bb5e51c
--- /dev/null
+++ b/Documentation/devicetree/bindings/usb/generic.txt
@@ -0,0 +1,24 @@
+Generic USB Properties
+
+Optional properties:
+ - maximum-speed: tells USB controllers we want to work up to a certain
+                        speed. Valid arguments are "super-speed", "high-speed",
+                        "full-speed" and "low-speed". In case this isn't passed
+                        via DT, USB controllers should default to their maximum
+                        HW capability.
+ - dr_mode: tells Dual-Role USB controllers that we want to work on a
+                        particular mode. Valid arguments are "host",
+                        "peripheral" and "otg". In case this attribute isn't
+                        passed via DT, USB DRD controllers should default to
+                        OTG.
+
+This is an attribute to a USB controller such as:
+
+dwc3@4a030000 {
+        compatible = "synopsys,dwc3";
+        reg = <0x4a030000 0xcfff>;
+        interrupts = <0 92 4>
+        usb-phy = <&usb2_phy>, <&usb3,phy>;
+        maximum-speed = "super-speed";
+        dr_mode = "otg";
+};