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From:   Arnd Bergmann <arnd@kernel.org>
Date:   Mon, 9 Nov 2020 18:56:26 +0100
Message-ID: <CAK8P3a374KTVR6vC4civ0pNy8S9n4o8Ni9wCrdko-JO7aRO2GQ@mail.gmail.com>
Subject: Re: [PATCH v2 1/2] arm64: dts: broadcom: clear the warnings caused by
 empty dma-ranges
To:     Florian Fainelli <f.fainelli@gmail.com>
Cc:     "Leizhen (ThunderTown)" <thunder.leizhen@huawei.com>,
        Rob Herring <robh+dt@kernel.org>, Ray Jui <rjui@broadcom.com>,
        Scott Branden <sbranden@broadcom.com>,
        bcm-kernel-feedback-list <bcm-kernel-feedback-list@broadcom.com>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        linux-arm-msm <linux-arm-msm@vger.kernel.org>,
        devicetree <devicetree@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Mon, Nov 9, 2020 at 6:30 PM Florian Fainelli <f.fainelli@gmail.com> wrote:
>
> On 11/8/20 10:18 PM, Leizhen (ThunderTown) wrote:
> > Hi, everybody:
> >   How do we deal with this problem? I updated the kernel to the latest and the problem still persists.
> >
> >   make ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- -j24 dtbs 2>err.txt
> >   vim err.txt
> >
> > arch/arm64/boot/dts/qcom/ipq6018.dtsi:185.3-14: Warning (dma_ranges_format): /soc:dma-ranges: empty "dma-ranges" property but its #address-cells (1) differs from / (2)
> > arch/arm64/boot/dts/qcom/ipq6018.dtsi:185.3-14: Warning (dma_ranges_format): /soc:dma-ranges: empty "dma-ranges" property but its #size-cells (1) differs from / (2)
> > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but its #address-cells (1) differs from / (2)
> > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but its #size-cells (1) differs from / (2)
> > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but its #address-cells (1) differs from / (2)
> > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but its #size-cells (1) differs from / (2)
> > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but its #address-cells (1) differs from / (2)
> > arch/arm64/boot/dts/broadcom/stingray/stingray-usb.dtsi:7.3-14: Warning (dma_ranges_format): /usb:dma-ranges: empty "dma-ranges" property but its #size-cells (1) differs from / (2)
>
> I was hoping that Ray or Scott could give this a try, and TBH, I am
> still not a big fan of having to mangle the 'reg' property to be
> compatible with #address-cells = <2> and #size-cells = <2>, I would have
> preferred omitting the 'dma-ranges' property entirely.
>
> We have plenty of time to get this patch applied for v5.11.

I would much prefer to get the warning fixed for v5.10, once we know what the
hardware can or cannot actually do, as it is one of the warnings that shows
up in every kernelci build.

      Arnd