linux-kernel - Re: [RFC v2 1/2] dt-bindings: connector: Add properties to define time values

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Message-ID: <20240921005616.GA185456-robh@kernel.org>
Date: Fri, 20 Sep 2024 19:56:16 -0500
From: Rob Herring <robh@...nel.org>
To: Amit Sunil Dhamne <amitsd@...gle.com>
Cc: gregkh@...uxfoundation.org, dmitry.baryshkov@...aro.org,
	heikki.krogerus@...ux.intel.com, badhri@...gle.com,
	kyletso@...gle.com, rdbabiera@...gle.com,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [RFC v2 1/2] dt-bindings: connector: Add properties to define
 time values

On Thu, Sep 19, 2024 at 12:51:13AM -0700, Amit Sunil Dhamne wrote:
> This commit adds the following properties:
>   * sink-wait-cap-time-ms
>   * ps-source-off-time-ms
>   * cc-debounce-time-ms
> 
> This is to enable setting of platform/board specific timer values as
> these timers have a range of acceptable values.

What's acceptable? Put that in constraints for the properties.

> 
> Signed-off-by: Amit Sunil Dhamne <amitsd@...gle.com>
> ---
>  .../bindings/connector/usb-connector.yaml     | 32 ++++++++++++++++++-
>  1 file changed, 31 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/connector/usb-connector.yaml b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> index fb216ce68bb3..5efa4ea3c41c 100644
> --- a/Documentation/devicetree/bindings/connector/usb-connector.yaml
> +++ b/Documentation/devicetree/bindings/connector/usb-connector.yaml
> @@ -253,6 +253,33 @@ properties:
>  
>      additionalProperties: false
>  
> +  sink-wait-cap-time-ms:
> +    description: Represents the max time in ms that USB Type-C port (in sink
> +      role) should wait for the port partner (source role) to send source caps.
> +      SinkWaitCap timer starts when port in sink role attaches to the source.
> +      This timer will stop when sink receives PD source cap advertisement before
> +      timeout in which case it'll move to capability negotiation stage. A
> +      timeout leads to a hard reset message by the port. If no value is set for
> +      this property then the driver assumes a default value of PD_T_SINK_WAIT_CAP
> +      (defined in include/linux/usb/pd.h).

Express default as "default: N". Sorry, defines don't work here.