On 26/11/2015 14:59, Russell King - ARM Linux wrote:
> On Thu, Nov 26, 2015 at 02:16:16PM +0100, Mason wrote:
>> #define SCU_BASE 0x20000000
>>
>> scu: scu@XXX {
>> compatible = "arm,cortex-a9-scu";
>> reg = <SCU_BASE 0x100>;
>>
>> gic: interrupt-controller@XXX {
>> compatible = "arm,cortex-a9-gic";
>> reg = <SCU_BASE+0x1000 0x1000>, <SCU_BASE+0x100 0x0100>;
>
> You don't get preprocessor arithmetic here. What you get is this passed
> to DTC:
>
> reg = <0x20000000+0x1000 0x1000>...
>
> The only time the preprocessor does arithmetic is when it needs to
> evaluate an expression, eg, in an #if statement.
Doh! Brain malfunction. No arithmetic indeed.
Working with the preprocessor would have to involve token-pasting.
#define SCU_BASE(OFFSET) 2000##OFFSET
#define SCU_BASEX(OFFSET) 0x2000##OFFSET
gic: interrupt-controller@SCU_BASE(1000) {
reg = <SCU_BASEX(1000) 0x1000>, <SCU_BASEX(0100) 0x0100>;
};
My very own abomination!
Regards.
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