Hi,


2015-07-30 0:23 GMT+09:00 Rob Herring [off-list ref]:

On Wed, Jul 29, 2015 at 8:22 AM, Ian Campbell [off-list ref] wrote:

quoted

On Wed, 2015-07-29 at 20:07 +0900, Masahiro Yamada wrote:

quoted

Hi Ian,


2015-07-27 19:35 GMT+09:00 Ian Campbell [off-list ref]:

quoted

Commit 9ccd608070b6 "arm64: dts: add device tree for ARM SMM-A53x2 on
LogicTile Express 20MG" added a new dts file to arch/arm64 which
included "../../../../arm/boot/dts/vexpress-v2m-rs1.dtsi", i.e. a
.dtsi supplied by arch/arm.

Unfortunately this causes some issues for the split device tree
repository[0], since things get moved around there. In that context
the new .dts ends up at src/arm64/arm/vexpress-v2f-1xv7-ca53x2.dts
while the include is at src/arm/vexpress-v2m-rs1.dtsi.

The sharing of the .dtsi is legitimate since the baseboard is the same
for various vexpress systems whatever processor they use.

Rather than using ../../ tricks to pickup .dtsi files from another
arch this patch creates a new directory include/dt-dtsi as a
home for such cross-arch .dtsi files, arranges for it to be in the
include path when the .dts files are processed by cpp and switches the

"include/dt-dtsi/"  can be referenced from normal C sources.

I think another possible home for cross-arch DTSI is "kernel/dts/".
This directory can be hidden from C sources.

I suppose, I don't really mind and will follow the direction of the other
DTB maintainers. It doesn't seem like a big deal to me.

Seems fine to me. We might think of other things to put here that are
not includes. Overlays perhaps?

Putting device trees below "include/" seems weird to me.


I thought, kernel/  is a place where we put something common among
architectures.


"kernel/configs/" was created as a home for cross-arch config fragments.


arch/${ARCH}/configs/  -  arch-specific *_defconfig and *.config
kernel/configs/        -  arch-common  *.config


Likewise,

arch/${ARCH}/boot/dts  -  arch-specific *.dts and *.dtsi
kernel/dts             -  arch-common  *.dtsi


This is just a matter of preference, though.



-- 
Best Regards
Masahiro Yamada