linux-kernel - Re: [PATCH 06/12] riscv: dts: allwinner: Add the D1 SoC base devicetree

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Message-Id: <C0B4F750-1C99-408A-A2DA-B72BBF7361B4@jrtc27.com>
Date:   Mon, 22 Aug 2022 16:29:02 +0100
From:   Jessica Clarke <jrtc27@...c27.com>
To:     Conor Dooley <conor.dooley@...rochip.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>, andre.przywara@....com,
        devicetree <devicetree@...r.kernel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Samuel Holland <samuel@...lland.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        jernej.skrabec@...il.com, prabhakar.mahadev-lad.rj@...renesas.com,
        wens@...e.org, robh+dt@...nel.org, palmer@...belt.com,
        krzysztof.kozlowski+dt@...aro.org, paul.walmsley@...ive.com,
        linux-riscv@...ts.infradead.org, linux-sunxi@...ts.linux.dev
Subject: Re: [PATCH 06/12] riscv: dts: allwinner: Add the D1 SoC base
 devicetree

On 22 Aug 2022, at 14:56, conor.dooley@...rochip.com wrote:
> 
> On 22/08/2022 13:31, Geert Uytterhoeven wrote:
>> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>> 
> 
> 
>>> Do you think this is worth doing? Or are you just providing an
>>> example of what could be done?
>> 
>> Just some brainstorming...
>> 
>>> Where would you envisage putting these macros? I forget the order
>>> of the CPP operations that are done, can they be put in the dts?
>> 
>> The SOC_PERIPHERAL_IRQ() macro should be defined in the
>> ARM-based SoC.dtsi file and the RISC-V-based SoC.dtsi file.
> 
> Right, one level up but ~the same result.
> 
> 
>>>> Nice! But it's gonna be a very large interrupt-map.
>>> 
>>> I quite like the idea of not duplicating files across the archs
>>> if it can be helped, but not at the expense of making them hard to
>>> understand & I feel like unfortunately the large interrupt map is
>>> in that territory.
>> 
>> I feel the same.
>> Even listing both interrupt numbers in SOC_PERIPHERAL_IRQ(na, nr)
>> is a risk for making mistakes.
>> 
>> So personally, I'm in favor of teaching dtc arithmetic, so we can
>> handle the offset in SOC_PERIPHERAL_IRQ().
> 
> Yup, in the same boat here. mayb I'll get bored enough to bite..

Note that GPL’ed dtc isn’t the only implementation. FreeBSD uses a
BSD-licensed implementation[1] and so adding new features like this to
GPL dtc that actually get used would require us to reimplement it too.
I don’t know how much effort it would be but please keep this in mind.

Jess

[1] https://github.com/davidchisnall/dtc