linux-kernel - Re: [PATCH 02/12] dt-bindings: riscv: sifive-ccache: Add 'uncached-offset' property

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Message-ID: <bed5244c-fcb5-1f95-9ff8-81c3a96ecff9@collabora.com>
Date:   Tue, 14 Feb 2023 19:58:17 +0200
From:   Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Conor Dooley <conor@...nel.org>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 02/12] dt-bindings: riscv: sifive-ccache: Add
 'uncached-offset' property

On 2/13/23 11:23, Krzysztof Kozlowski wrote:
> On 11/02/2023 04:18, Cristian Ciocaltea wrote:
>> Add the 'uncached-offset' property to be used for specifying the
>> uncached memory offset required for handling non-coherent DMA
>> transactions.
> 
> Only one offset can be non-coherent? If this is for DMA, why
> dma-noncoherent cannot be used?

As Conor already mentioned in [1], the handling of non-coherent DMA on 
RISC-V is currently being worked on, so I expect this patch will be dropped.

[1] https://lore.kernel.org/lkml/Y+d36nz0xdfXmDI1@spud/

Thanks for reviewing,
Cristian

> 
> Best regards,
> Krzysztof
>