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dt-bindings: usb: dwc3: Add Tx De-emphasis constraints

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In accordance with the driver comments the PIPE3 de-emphasis can be tuned
to be either -6dB, -2.5dB or disabled. Let's add the de-emphasis
property constraints so the DT schema would make sure the controller DT
node is equipped with correct value.

Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20201210090944.16283-14-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Serge Semin 2020-12-10 12:09:37 +03:00 committed by Greg Kroah-Hartman
parent f82dc55719
commit 6f84a28df8
1 changed files with 4 additions and 0 deletions
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4
Documentation/devicetree/bindings/usb/snps,dwc3.yaml
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@ -156,6 +156,10 @@ properties:
The value driven to the PHY is controlled by the LTSSM during USB3
Compliance mode.
$ref: /schemas/types.yaml#/definitions/uint8
enum:
- 0 # -6dB de-emphasis
- 1 # -3.5dB de-emphasis
- 2 # No de-emphasis
snps,dis_u3_susphy_quirk:
description: When set core will disable USB3 suspend phy