netdev - Re: [PATCH net-next v2 1/2] dt-bindings: net: airoha: Add EN7581 memory-region property

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Message-ID: <20250514200816.GA2934563-robh@kernel.org>
Date: Wed, 14 May 2025 15:08:16 -0500
From: Rob Herring <robh@...nel.org>
To: Lorenzo Bianconi <lorenzo@...nel.org>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org, netdev@...r.kernel.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH net-next v2 1/2] dt-bindings: net: airoha: Add EN7581
 memory-region property

On Fri, May 09, 2025 at 04:51:33PM +0200, Lorenzo Bianconi wrote:
> Introduce the memory-region and memory-region-names properties for the
> ethernet node available on EN7581 SoC. In order to improve performances,
> EN7581 SoC supports allocating buffers for hw forwarding queues in SRAM
> instead of DRAM if available on the system.

But 'reserved-memory' is generally for system memory which is DRAM 
though we unfortunately don't enforce that. For small onchip SRAM, you 
should be using the mmio-sram binding and the 'sram' property.

> 
> Signed-off-by: Lorenzo Bianconi <lorenzo@...nel.org>
> ---
>  .../devicetree/bindings/net/airoha,en7581-eth.yaml          | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml b/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml
> index 0fdd1126541774acacc783d98e4c089b2d2b85e2..6d22131ac2f9e28390b9e785ce33e8d983eafd0f 100644
> --- a/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml
> +++ b/Documentation/devicetree/bindings/net/airoha,en7581-eth.yaml
> @@ -57,6 +57,16 @@ properties:
>        - const: hsi-mac
>        - const: xfp-mac
>  
> +  memory-region:
> +    items:
> +      - description: QDMA0 buffer memory
> +      - description: QDMA1 buffer memory
> +
> +  memory-region-names:
> +    items:
> +      - const: qdma0-buf
> +      - const: qdma1-buf
> +
>    "#address-cells":
>      const: 1
>  
> @@ -140,6 +150,9 @@ examples:
>                       <GIC_SPI 49 IRQ_TYPE_LEVEL_HIGH>,
>                       <GIC_SPI 64 IRQ_TYPE_LEVEL_HIGH>;
>  
> +        memory-region = <&qdma0_buf>, <&qdma1_buf>;
> +        memory-region-names = "qdma0-buf", "qdma1-buf";
> +
>          airoha,npu = <&npu>;
>  
>          #address-cells = <1>;
> 
> -- 
> 2.49.0
>