Message-ID: <bed5244c-fcb5-1f95-9ff8-81c3a96ecff9@collabora.com>
Date:   Tue, 14 Feb 2023 19:58:17 +0200
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Subject: Re: [PATCH 02/12] dt-bindings: riscv: sifive-ccache: Add
 'uncached-offset' property
To:     Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>,
        Lee Jones <lee@kernel.org>, Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
        Jakub Kicinski <kuba@kernel.org>,
        Paolo Abeni <pabeni@redhat.com>,
        Emil Renner Berthing <kernel@esmil.dk>,
        Conor Dooley <conor@kernel.org>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Giuseppe Cavallaro <peppe.cavallaro@st.com>,
        Alexandre Torgue <alexandre.torgue@foss.st.com>,
        Jose Abreu <joabreu@synopsys.com>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        Richard Cochran <richardcochran@gmail.com>,
        Sagar Kadam <sagar.kadam@sifive.com>,
        Yanhong Wang <yanhong.wang@starfivetech.com>
Cc:     devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        netdev@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-stm32@st-md-mailman.stormreply.com,
        linux-arm-kernel@lists.infradead.org, kernel@collabora.com
References: <20230211031821.976408-1-cristian.ciocaltea@collabora.com>
 <20230211031821.976408-3-cristian.ciocaltea@collabora.com>
 <c895f199-2902-4c22-2453-829d946a8d11@linaro.org>
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From:   Cristian Ciocaltea <cristian.ciocaltea@collabora.com>
In-Reply-To: <c895f199-2902-4c22-2453-829d946a8d11@linaro.org>
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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
>