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SubjectRe: Similar SoCs with different CPUs and interrupt bindings
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On 2022-09-21 10:26, Krzysztof Kozlowski wrote:
> On 21/09/2022 11:20, Lad, Prabhakar wrote:
>>>
>>> What do you mean? Macros support string concatenation and simple
>>> arithmetic like adding numbers. I just tested it.
>>>
>> I did try the below:
>>
>> diff --git a/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
>> b/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
>> index 689aa4ba416b..0f923c276cd3 100644
>> --- a/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
>> +++ b/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
>> @@ -8,6 +8,8 @@
>> #include <dt-bindings/interrupt-controller/arm-gic.h>
>> #include <dt-bindings/clock/r9a07g043-cpg.h>
>>
>> +#define SOC_PERIPHERAL_IRQ(nr, na) GIC_SPI nr 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)>,
>> <GIC_SPI 331 IRQ_TYPE_EDGE_RISING>,
>> <GIC_SPI 332 IRQ_TYPE_EDGE_RISING>,
>> <GIC_SPI 333 IRQ_TYPE_EDGE_RISING>;
>>
>> This worked as expected, but couldn't get the arithmetic operation
>> working. Could you please provide an example?
>
> diff --git a/arch/arm64/boot/dts/renesas/r9a07g043.dtsi b/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> index ff6aab388eb7..0ecca775fa3f 100644
> --- a/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> +++ b/arch/arm64/boot/dts/renesas/r9a07g043.dtsi
> @@ -8,6 +8,8 @@
> #include <dt-bindings/interrupt-controller/arm-gic.h>
> #include <dt-bindings/clock/r9a07g043-cpg.h>
>
> +#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.

Thanks,
Robin.

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