Thread (17 messages) 17 messages, 6 authors, 2022-09-22

Re: Similar SoCs with different CPUs and interrupt bindings

From: Robin Murphy <robin.murphy@arm.com>
Date: 2022-09-21 10:14:24
Also in: linux-devicetree, linux-renesas-soc, linux-riscv, lkml

On 2022-09-21 10:26, Krzysztof Kozlowski wrote:
quoted hunk ↗ jump to hunk
On 21/09/2022 11:20, Lad, Prabhakar wrote:
quoted
quoted
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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