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Date:   Thu, 12 Jan 2023 15:24:51 +0100
From:   "Arnd Bergmann" <arnd@arndb.de>
To:     "Hawkins, Nick" <nick.hawkins@hpe.com>,
        "Verdun, Jean-Marie" <verdun@hpe.com>,
        "Jean Delvare" <jdelvare@suse.com>,
        "Guenter Roeck" <linux@roeck-us.net>,
        "Rob Herring" <robh+dt@kernel.org>,
        krzysztof.kozlowski+dt@linaro.org,
        "Jonathan Corbet" <corbet@lwn.net>,
        "Russell King" <linux@armlinux.org.uk>,
        linux-hwmon@vger.kernel.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v4 3/5] ARM: dts: add GXP Support for fans and SPI
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Precedence: bulk

On Tue, Jan 3, 2023, at 21:36, nick.hawkins@hpe.com wrote:
> From: Nick Hawkins <nick.hawkins@hpe.com>
>
> Reorganize the base address of AHB to accommodate the SPI and fan driver
> register requirements. Add the hpe,gxp-spifi and hpe,gxp-fan-ctrl
> compatibles. Add comments to make the register range more clear.
>
> Signed-off-by: Nick Hawkins <nick.hawkins@hpe.com>
>

> diff --git a/arch/arm/boot/dts/hpe-gxp.dtsi 
> b/arch/arm/boot/dts/hpe-gxp.dtsi
> index cf735b3c4f35..b73b22a93716 100644
> --- a/arch/arm/boot/dts/hpe-gxp.dtsi
> +++ b/arch/arm/boot/dts/hpe-gxp.dtsi
> @@ -1,6 +1,6 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
> - * Device Tree file for HPE GXP
> + * Device Tree for HPE
>   */
> 
>  /dts-v1/;
> @@ -52,76 +52,102 @@
>  			cache-level = <2>;
>  		};
> 
> -		ahb@c0000000 {
> +		ahb@80000000 {
>  			compatible = "simple-bus";
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> -			ranges = <0x0 0xc0000000 0x30000000>;
> +			ranges = <0x0 0x80000000 0xf000000>, /* 0x80000000 - 0x8f000000 */
> +				 <0x40000000 0xc0000000 0x7fffffff>; /* 0xc0000000 - 0xffffffff */

I'm a bit confused by the change in the mappings: are you
sure this all the same ahb bus and not two separate buses?

The comment for the second range looks wrong to me, as
you define a 2GB (minus one byte) sized mapping but the
comment only lists a 1GB (including the last byte) mapping.

I would expect that the original 0x30000000 (including the
last byte) was correct here.

> -			vic1: interrupt-controller@80f00000 {
> +			vic1: interrupt-controller@f00000 { /* 0x80f00000 */

This is not the same address as before. I'm also not sure the
comment is helpful here.

    Arnd