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

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Message-ID: <0deaf87a-5010-0113-c86e-9a4b13d7dd3c@microchip.com>
Date:   Wed, 31 May 2023 06:31:41 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <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>
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 12:51, Pranavi Somisetty wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
> 
> 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

I still think keeping this on 32 bits is still a better idea to have this
DT property useable on future hardware implementation that may expand it.

> +    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.

s/4,8/4, 8

> +
>    '#address-cells':
>      const: 1
> 
> @@ -166,6 +174,7 @@ examples:
>              compatible = "cdns,macb";
>              reg = <0xfffc4000 0x4000>;
>              interrupts = <21>;
> +            cdns,rx-watermark = /bits/ 16 <0x44>;
>              phy-mode = "rmii";
>              local-mac-address = [3a 0e 03 04 05 06];
>              clock-names = "pclk", "hclk", "tx_clk";
> --
> 2.36.1
>