On 21/09/2022 12:14, Robin Murphy wrote:

quoted

+#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


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