Preprocessor arithmetic in dtsi files (base + offset)
Mason
slash.tmp at free.fr
Thu Nov 26 05:16:16 PST 2015
Hello,
In the device tree for my ARM platform, I have several nodes with
addresses within the SCU block:
scu: scu at 20000000 {
compatible = "arm,cortex-a9-scu";
reg = <0x20000000 0x100>;
gic: interrupt-controller at 20001000 {
compatible = "arm,cortex-a9-gic";
reg = <0x20001000 0x1000>, <0x20000100 0x0100>;
twd-timer at 20000600 {
compatible = "arm,cortex-a9-twd-timer";
reg = <0x20000600 0x10>;
Can I use preprocessor arithmetic to abstract the base address,
as would be done in C?
#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>;
twd-timer at XXX {
compatible = "arm,cortex-a9-twd-timer";
reg = <SCU_BASE+0x600 0x10>;
Are the @XXX important? Can they be removed altogether?
Regards.
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