linux-kernel - Re: [PATCH net-next v3 1/2] dt-bindings: net: cdns,macb: Add rx-watermark property

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Date:   Wed, 31 May 2023 09:18:15 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Pranavi Somisetty <pranavi.somisetty@....com>, davem@...emloft.net,
        edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        nicolas.ferre@...rochip.com, claudiu.beznea@...rochip.com
Cc:     git@....com, michal.simek@....com, harini.katakam@....com,
        radhey.shyam.pandey@....com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v3 1/2] dt-bindings: net: cdns,macb: Add
 rx-watermark property

On 30/05/2023 11:51, Pranavi Somisetty wrote:
> watermark value is the minimum amount of packet data
> required to activate the forwarding process. The watermark
> implementation and maximum size is dependent on the device
> where Cadence MACB/GEM is used.
> 
> Signed-off-by: Pranavi Somisetty <pranavi.somisetty@....com>
> ---
> Changes v2:
> None (patch added in v2)
> 
> Changes v3:
> 1. Fixed DT schema error: "scalar properties shouldn't have array keywords".
> 2. Modified description of rx-watermark to include units of the watermark value.
> 3. Modified the DT property name corresponding to rx_watermark in
> pbuf_rxcutthru to "cdns,rx-watermark".
> 4. Modified commit description to remove references to Xilinx platforms,
> since the changes aren't platform specific.
> --- 
>  Documentation/devicetree/bindings/net/cdns,macb.yaml | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/cdns,macb.yaml b/Documentation/devicetree/bindings/net/cdns,macb.yaml
> index bef5e0f895be..2c733c061dce 100644
> --- a/Documentation/devicetree/bindings/net/cdns,macb.yaml
> +++ b/Documentation/devicetree/bindings/net/cdns,macb.yaml
> @@ -109,6 +109,14 @@ properties:
>    power-domains:
>      maxItems: 1
>  
> +  cdns,rx-watermark:
> +    $ref: /schemas/types.yaml#/definitions/uint16
> +    description:
> +      Set watermark value for pbuf_rxcutthru reg and enable
> +      rx partial store and forward. Watermark value here
> +      corresponds to number of SRAM locations. The width of SRAM is
> +      system dependent and can be 4,8 or 16 bytes.

You described device programming model - registers - not the actual
hardware.

Best regards,
Krzysztof