linux-kernel - Re: [PATCH] dt-bindings: mtd: cdns,hp-nfc: Add dma-coherent property

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Message-ID: <20260131-pasty-dicing-4ed7799aa546@spud>
Date: Sat, 31 Jan 2026 20:26:50 +0000
From: Conor Dooley <conor@...nel.org>
To: Dinh Nguyen <dinguyen@...nel.org>
Cc: miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
	linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Khairul Anuar Romli <khairul.anuar.romli@...era.com>,
	Rob Herring <robh@...nel.org>
Subject: Re: [PATCH] dt-bindings: mtd: cdns,hp-nfc: Add dma-coherent property

On Sat, Jan 31, 2026 at 11:26:11AM -0600, Dinh Nguyen wrote:
> From: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
> 
> The Cadence HP NAND Flash Controller on supports DMA transactions through
> a coherent interconnect. In previous generations SoC (Stratix10 and Agilex)
> the interconnect was non-coherent, hence there is no need for dma-coherent
> property to be presence. In Agilex 5, the architecture has changed. It
> introduced a coherent interconnect that supports cache-coherent DMA.
> 
> Signed-off-by: Khairul Anuar Romli <khairul.anuar.romli@...era.com>
> Reviewed-by: Rob Herring (Arm) <robh@...nel.org>

Why does this v1 have an ack?

> Signed-off-by: Dinh Nguyen <dinguyen@...nel.org>
> ---
>  Documentation/devicetree/bindings/mtd/cdns,hp-nfc.yaml | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/cdns,hp-nfc.yaml b/Documentation/devicetree/bindings/mtd/cdns,hp-nfc.yaml
> index 73dc69cee4d8..367257a227b1 100644
> --- a/Documentation/devicetree/bindings/mtd/cdns,hp-nfc.yaml
> +++ b/Documentation/devicetree/bindings/mtd/cdns,hp-nfc.yaml
> @@ -40,6 +40,8 @@ properties:
>    dmas:
>      maxItems: 1
>  
> +  dma-coherent: true
> +
>    iommus:
>      maxItems: 1
>  
> -- 
> 2.42.0.411.g813d9a9188
> 
> 

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