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Subject[PATCH v5 13/19] dt-bindings: usb: dwc3: Add Tx De-emphasis constraints
Date
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.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Rob Herring <robh@kernel.org>

---

Changelog v2:
- Grammar fix: "s/tunned/tuned"
- Grammar fix: remove redundant "or" conjunction.
---
Documentation/devicetree/bindings/usb/snps,dwc3.yaml | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
index b1890558affe..e39ad899c92e 100644
--- a/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
+++ b/Documentation/devicetree/bindings/usb/snps,dwc3.yaml
@@ -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
--
2.29.2
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