[yocto] Ifdef on devicetree

[luciosantinell at libero.it]

Hi,

i'm trying to add some #ifdef on my device tree in order to separate two different imports.

#include "imx6q.dtsi"
#ifdef MMC_WRITE
#include "imx6qdl-sabre-mmc.dtsi"
#elif
#include "imx6qdl-sabre-sd.dtsi"
#endif

where can i add a macro to select what kind of device tree i must import?
in /arch/arm/boot i found a Makefile
and another one in /arch/arm/boot/dts
but i dont know how to define a macro for device-trees.

Thanks
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