linux-kernel - Re: [PATCH v6 7/8] ARM: dts: Introduce HPE GXP Device tree

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Date:   Tue, 3 May 2022 12:45:47 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     "Hawkins, Nick" <nick.hawkins@....com>
Cc:     "Verdun, Jean-Marie" <verdun@....com>, nick@....com,
        Joel Stanley <joel@....id.au>, Arnd Bergmann <arnd@...db.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Olof Johansson <olof@...om.net>, SoC Team <soc@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        DTML <devicetree@...r.kernel.org>
Subject: Re: [PATCH v6 7/8] ARM: dts: Introduce HPE GXP Device tree

On Mon, May 2, 2022 at 10:40 PM <nick.hawkins@....com> wrote:

> --- /dev/null
> +++ b/arch/arm/boot/dts/hpe-bmc-dl360gen10.dts
> @@ -0,0 +1,13 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device Tree file for HPE DL360Gen10
> + */
> +
> +/include/ "hpe-gxp.dtsi"
> +
> +/ {
> +       #address-cells = <1>;
> +       #size-cells = <1>;
> +       compatible = "hpe,gxp-dl360gen10","hpe,gxp";
> +       model = "Hewlett Packard Enterprise ProLiant dl360 Gen10";
> +};

In the board specific file, you normally have "aliases", "chosen" and "memory"
nodes that define e.g. which uart is used for the console.

> diff --git a/arch/arm/boot/dts/hpe-gxp.dtsi b/arch/arm/boot/dts/hpe-gxp.dtsi
> new file mode 100644
> index 000000000000..7a99e174e4b3
> --- /dev/null
> +++ b/arch/arm/boot/dts/hpe-gxp.dtsi
> @@ -0,0 +1,132 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Device Tree file for HPE GXP
> + */
> +
> +/dts-v1/;
> +/ {
> +       model = "Hewlett Packard Enterprise GXP BMC";
> +       compatible = "hpe,gxp", "hpe,gxp-dl360gen10";

I think "hpe,gxp-dl360gen10" is misplaced here, if that is the identifier
of a particular machine rather than the SoC.

> +       memory@...00000 {
> +               device_type = "memory";
> +               reg = <0x40000000 0x20000000>;
> +       };

If the memory is outside of the SoC, it should not be here.

> +       axi {
> +               compatible = "simple-bus";
> +               #address-cells = <1>;
> +               #size-cells = <1>;
> +               ranges;
> +               dma-ranges;
> +
> +               L2: cache-controller@...40000 {
> +                       compatible = "arm,pl310-cache";
> +                       reg = <0xb0040000 0xFFC>;
> +                       cache-unified;
> +                       cache-level = <2>;
> +               };

The length of the register area looks wrong, this is usually the full
4KB area, rather than leaving out the last four bytes.

        Arnd