Preprocessor arithmetic in dtsi files (base + offset)

[Russell King - ARM Linux]

On Thu, Nov 26, 2015 at 02:16:16PM +0100, Mason wrote:
> #define SCU_BASE 0x20000000
> 
> 	scu: scu at XXX {
> 		compatible = "arm,cortex-a9-scu";
> 		reg = <SCU_BASE 0x100>;
> 	
> 	gic: interrupt-controller at 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.

The @XXX are part of the requirements from ePAPR, and are required to
be conformant with the spec.

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