diff options
author | Felipe Balbi <balbi@ti.com> | 2013-06-30 12:56:45 +0200 |
---|---|---|
committer | Felipe Balbi <balbi@ti.com> | 2013-07-29 12:56:46 +0200 |
commit | 1494a1f62bf7cf57345e9282c8189fe2a21fab64 (patch) | |
tree | 16b5e45329a149af37278811b760422ae5e0d46d /Documentation/devicetree/bindings/usb/generic.txt | |
parent | usb: phy: protect against NULL phy pointers (diff) | |
download | linux-1494a1f62bf7cf57345e9282c8189fe2a21fab64.tar.xz linux-1494a1f62bf7cf57345e9282c8189fe2a21fab64.zip |
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>
Diffstat (limited to 'Documentation/devicetree/bindings/usb/generic.txt')
-rw-r--r-- | Documentation/devicetree/bindings/usb/generic.txt | 24 |
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"; +}; |