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Date:   Wed, 21 Sep 2022 12:17:33 +0200
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Subject: Re: Similar SoCs with different CPUs and interrupt bindings
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To:     Robin Murphy <robin.murphy@arm.com>,
        "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Andre Przywara <andre.przywara@arm.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        Samuel Holland <samuel@sholland.org>,
        Biju Das <biju.das.jz@bp.renesas.com>,
        Chris Paterson <Chris.Paterson2@renesas.com>,
        Atish Patra <atishp@atishpatra.org>,
        "Lad, Prabhakar" <prabhakar.mahadev-lad.rj@bp.renesas.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        Linux-Renesas <linux-renesas-soc@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Olof Johansson <olof@lixom.net>
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 <567e9e6c-e34c-4ded-9622-9ad8387dd24b@arm.com>
From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
In-Reply-To: <567e9e6c-e34c-4ded-9622-9ad8387dd24b@arm.com>
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On 21/09/2022 12:14, Robin Murphy wrote:
>> +#define SOC_PERIPHERAL_IRQ_NUMBER(na)  (na + 32)
>> +#define SOC_PERIPHERAL_IRQ(nr, na) GIC_SPI nr SOC_PERIPHERAL_IRQ_NUMBER(na)
>>   / {
>>          compatible = "renesas,r9a07g043";
>>          #address-cells = <2>;
>> @@ -128,7 +130,7 @@ ssi1: ssi@1004a000 {
>>                          compatible = "renesas,r9a07g043-ssi",
>>                                       "renesas,rz-ssi";
>>                          reg = <0 0x1004a000 0 0x400>;
>> -                       interrupts = <GIC_SPI 330 IRQ_TYPE_LEVEL_HIGH>,
>> +                       interrupts = <SOC_PERIPHERAL_IRQ(330, IRQ_TYPE_LEVEL_HIGH)>,
>>
>>
>>
>> Or any other method like that....
> 
> Which will generate the text:
> 
> 	"interrupts = <GIC_SPI 330 (IRQ_TYPE_LEVEL_HIGH + 32)>,"
> 
> (give or take some whitespace)
> 
> CPP supports constant expressions in #if and #elif directives, but 
> macros are purely literal text replacement. It might technically be 
> achievable with some insane CPP metaprogramming, but for all practical 
> purposes this is a non-starter unless dtc itself grows the ability to 
> process arithmetic expressions.

Except I put it into flags, not to IRQ number, it works, so I am not
sure why do you call it non-starter?

Best regards,
Krzysztof