2023-05-16 16:23:07

by Johannes Zink

Subject: [PATCH v2 1/2] dt-bindings: phy: imx8mq-usb: add phy tuning properties

Add optional properties for tuning of usb phy.

Signed-off-by: Johannes Zink <[email protected]>
---
.../bindings/phy/fsl,imx8mq-usb-phy.yaml | 47 ++++++++++++++++++++++
1 file changed, 47 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
index e6f9f5540cc3..dc3a3f709fea 100644
--- a/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
+++ b/Documentation/devicetree/bindings/phy/fsl,imx8mq-usb-phy.yaml
@@ -35,6 +35,53 @@ properties:
description:
A phandle to the regulator for USB VBUS.

+ fsl,phy-tx-vref-tune-percent:
+ description:
+ Tunes the HS DC level relative to the nominal level
+ minimum: 94
+ maximum: 124
+
+ fsl,phy-tx-rise-tune-percent:
+ description:
+ Adjusts the rise/fall time duration of the HS waveform relative to
+ its nominal value
+ minimum: 97
+ maximum: 103
+
+ fsl,phy-tx-preemp-amp-tune-microamp:
+ description:
+ Adjust amount of current sourced to DPn and DMn after a J-to-K
+ or K-to-J transition. Default is 0 (disabled).
+ minimum: 0
+ maximum: 1800
+
+ fsl,phy-tx-vboost-level-microvolt:
+ description:
+ Adjust the boosted transmit launch pk-pk differential amplitude
+ minimum: 880
+ maximum: 1120
+
+ fsl,phy-comp-dis-tune-percent:
+ description:
+ Adjust the voltage level used to detect a disconnect event at the host
+ relative to the nominal value
+ minimum: 91
+ maximum: 115
+
+ fsl,phy-pcs-tx-deemph-3p5db-attenuation-db:
+ description:
+ Adjust TX de-emphasis attenuation in dB at nominal
+ 3.5dB point as per USB specification
+ $ref: /schemas/types.yaml#/definitions/uint32
+ minimum: 0
+ maximum: 36
+
+ fsl,phy-pcs-tx-swing-full-percent:
+ description:
+ Scaling of the voltage defined by fsl,phy-tx-vboost-level-microvolt
+ minimum: 0
+ maximum: 100
+
required:
- compatible
- reg

--
2.39.2

2023-05-17 09:00:04

by Krzysztof Kozlowski

Subject: Re: [PATCH v2 1/2] dt-bindings: phy: imx8mq-usb: add phy tuning properties

On 16/05/2023 18:20, Johannes Zink wrote:
> Add optional properties for tuning of usb phy.
>
> Signed-off-by: Johannes Zink <[email protected]>
> ---
> .../bindings/phy/fsl,imx8mq-usb-phy.yaml | 47 ++++++++++++++++++++++
> 1 file changed, 47 insertions(+)
>

Reviewed-by: Krzysztof Kozlowski <[email protected]>

Best regards,
Krzysztof