On Friday 13 November 2015 10:33:50 Mason wrote:
> Hello,
>
> I'm wondering how much C preprocessor syntax one can use in DT files.
>
> Suppose I have 2 board DTS (both including common.dtsi)
>
> board_A.dts (1-core), board_B.dts (2-core)
>
> Can I have in common.dtsi something along these lines:
>
> cpus {
> enable-method = "foo,bar";
> #address-cells = <1>;
> #size-cells = <0>;
>
> cpu0: cpu@0 {
> compatible = "arm,cortex-a9";
> device_type = "cpu";
> reg = <0>;
> };
>
> #if CORE_COUNT > 1
> cpu1: cpu@1 {
> compatible = "arm,cortex-a9";
> device_type = "cpu";
> reg = <1>;
> };
> #endif
> };
>
>
> board_A.dts would have
> #define CORE_COUNT 1
> #include "common.dtsi"
>
> board_B.dts would have
> #define CORE_COUNT 2
> #include "common.dtsi"
I would prefer not using any preprocessor statements other than
#include in .dts files. It's easy enough to have a per-soc
.dtsi file that defines the CPU nodes and goes on to include another
.dtsi file with the common parts that are present on all SoCs.
Have a look at how the armada-*.dtsi files handle this.
Arnd
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