linux-kernel - Re: [PATCH 1/4] dt-bindings: i3c: Add snps,dev-nack-retry-cnt property to Synopsys I3C master

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Message-ID: <aQpTOXIPzHI5q7Y7@lizhi-Precision-Tower-5810>
Date: Tue, 4 Nov 2025 14:25:45 -0500
From: Frank Li <Frank.li@....com>
To: adrianhoyin.ng@...era.com
Cc: alexandre.belloni@...tlin.com, wsa+renesas@...g-engineering.com,
	robh@...nel.org, krzk+dt@...nel.org, conor+dt@...nel.org,
	dinguyen@...nel.org, linux-i3c@...ts.infradead.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] dt-bindings: i3c: Add snps,dev-nack-retry-cnt
 property to Synopsys I3C master

On Tue, Nov 04, 2025 at 04:51:08PM +0800, adrianhoyin.ng@...era.com wrote:
> From: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
>
> Add a new optional property 'snps,dev-nack-retry-cnt' to the Synopsys
> DesignWare I3C master device tree binding. This property allows
> configuration of the Device NACK Retry count, which determines how many
> times the controller retries a transaction when a slave device responds
> with NACK.

Look like it is software property, why need put in dt?

Frank

>
> Valid values range from 0 to 3, with a default of 0
>
> Signed-off-by: Adrian Ng Ho Yin <adrianhoyin.ng@...era.com>
> ---
>  .../devicetree/bindings/i3c/snps,dw-i3c-master.yaml       | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.yaml b/Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.yaml
> index 5f6467375811..c233be2d4a3c 100644
> --- a/Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.yaml
> +++ b/Documentation/devicetree/bindings/i3c/snps,dw-i3c-master.yaml
> @@ -37,6 +37,14 @@ properties:
>    power-domains:
>      maxItems: 1
>
> +  snps,dev-nack-retry-cnt:
> +    description: |
> +      This field is used to set the Device NACK Retry count for the
> +      particular slave device.
> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    default: 0
> +    maximum: 3
> +
>  required:
>    - compatible
>    - reg
> --
> 2.49.GIT
>