linux-kernel - Re: [PATCH 1/4] dt-bindings: phy: qcom,snps-eusb2-repeater: Document qcom,tune-res-fsdif

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Message-ID: <20250708-unicorn-of-ancient-excellence-e8945c@krzk-bin>
Date: Tue, 8 Jul 2025 10:13:24 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Luca Weiss <luca.weiss@...rphone.com>
Cc: Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Abel Vesa <abel.vesa@...aro.org>, ~postmarketos/upstreaming@...ts.sr.ht, 
	phone-devel@...r.kernel.org, linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: phy: qcom,snps-eusb2-repeater: Document
 qcom,tune-res-fsdif

On Wed, Jun 25, 2025 at 11:14:56AM +0200, Luca Weiss wrote:
> Document the FS Differential TX Output Resistance Tuning value found on
> the eUSB2 repeater on Qualcomm PMICs.
> 
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> index 27f064a71c9fb8cb60e8333fb285f0510a4af94f..6bfd11657e2992735998063b3ca390e04a03930d 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> @@ -52,6 +52,12 @@ properties:
>      minimum: 0
>      maximum: 7
>  
> +  qcom,tune-res-fsdif:
> +    $ref: /schemas/types.yaml#/definitions/uint8
> +    description: FS Differential TX Output Resistance Tuning

Resistance is in Ohms, tuning could be in dB, so I wonder what are the
actual units here. Neither commit msg nor this description helps me to
understand that.

Best regards,
Krzysztof