netdev - Re: [PATCH] arm64: dts: fsd: Change the reg properties from 64-bit to 32-bit

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Message-ID: <d63b59c3-f67d-e5ee-6cbf-9f97eec0aeaa@arm.com>
Date:   Wed, 16 Nov 2022 12:38:19 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Arnd Bergmann <arnd@...db.de>,
        Vivek Yadav <vivek.2311@...sung.com>, rcsekar@...sung.com,
        krzysztof.kozlowski+dt@...aro.org,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, pankaj.dubey@...sung.com,
        ravi.patel@...sung.com, Alim Akhtar <alim.akhtar@...sung.com>,
        linux-fsd@...la.com, Rob Herring <robh+dt@...nel.org>
Cc:     linux-can@...r.kernel.org, Netdev <netdev@...r.kernel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org,
        aswani.reddy@...sung.com, sriranjani.p@...sung.com,
        ajaykumar.rs@...sung.com
Subject: Re: [PATCH] arm64: dts: fsd: Change the reg properties from 64-bit to
 32-bit

On 2022-11-16 11:16, Arnd Bergmann wrote:
> On Wed, Nov 16, 2022, at 10:12, Vivek Yadav wrote:
>> Change the reg properties from 64-bit to 32-bit for all IPs, as none of
>> the nodes are above 32-bit range in the fsd SoC.
>>
>> Since dma-ranges length does not fit into 32-bit size, keep it 64-bit
>> and move it to specific node where it is used instead of SoC section.
> 
> I don't think that works, the dma-ranges property is part of the
> bus, not a particular device:
> 
>   		mdma0: dma-controller@...00000 {
>   			compatible = "arm,pl330", "arm,primecell";
> -			reg = <0x0 0x10100000 0x0 0x1000>;
> +			reg = <0x10100000 0x1000>;
>   			interrupts = <GIC_SPI 424 IRQ_TYPE_LEVEL_HIGH>;
>   			#dma-cells = <1>;
>   			clocks = <&clock_imem IMEM_DMA0_IPCLKPORT_ACLK>;
>   			clock-names = "apb_pclk";
>   			iommus = <&smmu_imem 0x800 0x0>;
> +			#address-cells = <2>;
> +			#size-cells = <2>;
> +			dma-ranges = <0x0 0x0 0x0 0x10 0x0>;
>   		};
> 
> Since the dma-controller has no children, I don't see how this has
> any effect. Also, translating a 36-bit address into a 32-bit
> address just means it gets truncated anyway, so there is no
> point in making it appear to have a larger address range.

Yes, this is definitely bogus on both counts.

Thanks,
Robin.