linux-kernel - Re: [PATCH v5 10/11] arch: arm: boot: dts: Introduce HPE GXP Device tree

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Date:   Fri, 22 Apr 2022 15:06:38 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Hawkins, Nick" <nick.hawkins@....com>
Cc:     "Verdun, Jean-Marie" <verdun@....com>,
        Joel Stanley <joel@....id.au>, Arnd Bergmann <arnd@...db.de>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Olof Johansson <olof@...om.net>, SoC Team <soc@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        DTML <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 10/11] arch: arm: boot: dts: Introduce HPE GXP Device tree

On Thu, Apr 21, 2022 at 9:21 PM <nick.hawkins@....com> wrote:

> +       axi {
> +               compatible = "simple-bus";
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +               ranges;
> +               dma-ranges;
> +
> +               ahb@...00000 {
> +                       compatible = "simple-bus";
> +                       #address-cells = <1>;
> +                       #size-cells = <1>;
> +                       ranges = <0x0 0xc0000000 0x30000000>;

I think you should add a "dma-ranges" property in the ahb node as well,
otherwise this would mean that none of the children are DMA capable,
when at the minimum the USB controllers require DMA.

       Arnd