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1494a1f62b
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>
25 lines
790 B
Plaintext
25 lines
790 B
Plaintext
Generic USB Properties
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Optional properties:
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- maximum-speed: tells USB controllers we want to work up to a certain
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speed. Valid arguments are "super-speed", "high-speed",
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"full-speed" and "low-speed". In case this isn't passed
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via DT, USB controllers should default to their maximum
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HW capability.
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- dr_mode: tells Dual-Role USB controllers that we want to work on a
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particular mode. Valid arguments are "host",
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"peripheral" and "otg". In case this attribute isn't
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passed via DT, USB DRD controllers should default to
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OTG.
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This is an attribute to a USB controller such as:
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dwc3@4a030000 {
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compatible = "synopsys,dwc3";
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reg = <0x4a030000 0xcfff>;
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interrupts = <0 92 4>
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usb-phy = <&usb2_phy>, <&usb3,phy>;
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maximum-speed = "super-speed";
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dr_mode = "otg";
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};
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