RFC ARM: use C pre-processor with dtc
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Cover letter [RFC PATCH 0/3] ARM: use C pre-processor with dtc
Quoted 14 lines · Stephen Warren
Quoted 5 lines · Scott Wood
Do you have an example of where you'd actually benefit from this? I'd think most things could either be done reasonably well with what's built into DTC (see what we've done in
arch/powerpc/boot/dts/fsl), or would need math expression support in DTC (or has that been added?).Yes, support for basic integer math in cell values has indeed been recently added to upstream dtc. I don't believe this has been ported into the in-kernel dtc yet though.
The primary motivation here is probably naming constants and associated readability. For example, instead of:
Quoted 7 lines
nvidia,phy-reset-gpio = <&gpio 169 0>; /* gpio PV1 */
You could write:
nvidia,phy-reset-gpio = <&gpio
TEGRA_GPIO_PV10>;No more opaque numbers!
This would be nice indeed.
Regards,
Tony