linux-kernel - Re: [PATCH v14 6/8] arm64: dts: Add AMD Pensando Elba SoC support

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Date:   Wed, 24 May 2023 13:52:40 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Brad Larson <blarson@....com>
Cc:     michal.simek@....com, adrian.hunter@...el.com, alcooperx@...il.com,
        andy.shevchenko@...il.com, arnd@...db.de,
        brendan.higgins@...ux.dev, briannorris@...omium.org,
        broonie@...nel.org, catalin.marinas@....com, conor+dt@...nel.org,
        davidgow@...gle.com, devicetree@...r.kernel.org,
        fancer.lancer@...il.com, gerg@...ux-m68k.org, gsomlo@...il.com,
        hal.feng@...rfivetech.com, hasegawa-hitomi@...itsu.com,
        j.neuschaefer@....net, joel@....id.au, kernel@...il.dk,
        krzk@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        lee.jones@...aro.org, lee@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, linux-spi@...r.kernel.org,
        p.zabel@...gutronix.de, rdunlap@...radead.org, robh+dt@...nel.org,
        samuel@...lland.org, skhan@...uxfoundation.org,
        suravee.suthikulpanit@....com, thomas.lendacky@....com,
        tonyhuang.sunplus@...il.com, ulf.hansson@...aro.org,
        vaishnav.a@...com, walker.chen@...rfivetech.com, will@...nel.org,
        zhuyinbo@...ngson.cn
Subject: Re: [PATCH v14 6/8] arm64: dts: Add AMD Pensando Elba SoC support

Hi Brad,

On Tue, May 23, 2023 at 9:30 PM Brad Larson <blarson@....com> wrote:
> On 5/16/23 09:54, Michal Simek wrote:
> > On 5/15/23 20:16, Brad Larson wrote:
> >> --- /dev/null
> >> +++ b/arch/arm64/boot/dts/amd/elba-16core.dtsi
> >> @@ -0,0 +1,197 @@
> >> +// SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
> >> +/*
> >> + * Copyright 2020-2022 Advanced Micro Devices, Inc.
> >
> > 2023 and the same below.
>
> I'll update the copyright in the next submit

Did you make any substantial changes in 2023?

> >> + */
> >> +
> >> +/ {
> >> +    cpus {
> >> +            #address-cells = <2>;
> >> +            #size-cells = <0>;
> >> +
> >> +            cpu-map {
> >> +                    cluster0 {
> >> +                            core0 { cpu = <&cpu0>; };
> >> +                            core1 { cpu = <&cpu1>; };
> >> +                            core2 { cpu = <&cpu2>; };
> >> +                            core3 { cpu = <&cpu3>; };
> >> +                    };
> >> +
> >> +                    cluster1 {
> >> +                            core0 { cpu = <&cpu4>; };
> >> +                            core1 { cpu = <&cpu5>; };
> >> +                            core2 { cpu = <&cpu6>; };
> >> +                            core3 { cpu = <&cpu7>; };
> >> +                    };
> >> +
> >> +                    cluster2 {
> >> +                            core0 { cpu = <&cpu8>; };
> >> +                            core1 { cpu = <&cpu9>; };
> >> +                            core2 { cpu = <&cpu10>; };
> >> +                            core3 { cpu = <&cpu11>; };
> >> +                    };
> >> +
> >> +                    cluster3 {
> >> +                            core0 { cpu = <&cpu12>; };
> >> +                            core1 { cpu = <&cpu13>; };
> >> +                            core2 { cpu = <&cpu14>; };
> >> +                            core3 { cpu = <&cpu15>; };
> >> +                    };
> >> +            };
> >> +
> >> +            /* CLUSTER 0 */
> >> +            cpu0: cpu@0 {
> >> +                    device_type = "cpu";
> >> +                    compatible = "arm,cortex-a72";
> >> +                    reg = <0 0x0>;
> >
> > Do you really need 2/0 split here. The first cell is 0 anyway.
>
> Yes following 64-bit system definition

You mean for the 64-bit main address space?
The CPU address space under /cpus is unrelated.

> >> +++ b/arch/arm64/boot/dts/amd/elba-flash-parts.dtsi
> >> @@ -0,0 +1,106 @@
> >> +// SPDX-License-Identifier: (GPL-2.0-only or BSD-2-Clause)
> >> +/*
> >> + * Copyright 2020-2022 Advanced Micro Devices, Inc.
> >> + */
> >> +
> >> +&flash0 {
> 0xf0000>> +     partitions {
> >> +            compatible = "fixed-partitions";
> >> +            #address-cells = <1>;
> >> +            #size-cells = <1>;
> >> +            partition@0 {
> >> +                    label = "flash";
> >> +                    reg = <0x10000 0xfff0000>;
> >
> > This doesn't fit with partition@0 above.
> > Also size is weird.
>
> This is intended to not expose sector 0.

The unit address should still match the first reg entry
=> partition@...00.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds