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dts: bindings: usb: Add enum to maximum-speed property

Add enum to list what values of maximum-speed are exceptable since
enum's get represented as strings in DT.  This also allows us to
generate a code enum to correspond to the string.

We also introduce include/dt-bindings/usb/usb.h which is a hand coded
definition of the enum.  We don't have a great way to generate this
right now, however it would be better if we did.

Signed-off-by: Kumar Gala <>
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galak committed May 14, 2019
1 parent 983b493 commit 2cac70e099383eb7b356d076bdeac74898ba34d1
Showing with 27 additions and 0 deletions.
  1. +5 −0 dts/bindings/usb/usb.yaml
  2. +22 −0 include/dt-bindings/usb/usb.h
@@ -26,6 +26,11 @@ properties:
via DT, USB controllers should use their maximum
hardware capability.
generation: define
- "low-speed"
- "full-speed"
- "high-speed"
- "super-speed"

type: string
@@ -0,0 +1,22 @@
* Copyright (c) 2019 Linaro Limited
* SPDX-License-Identifier: Apache-2.0

/* Ideally we'd generate this enum to match what's coming out of the YAML,
* however, we dont have a good way to know how to name such an enum from
* the generation point of view, so for now we just hand code the enum. This
* enum is expected to match the order in the yaml (dts/bindings/usb/usb.yaml)

enum dt_usb_maximum_speed {


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