[U-Boot] [U-Boot, RFC] kbuild: turn of dtc unit address warnings by default

[Tom Rini]

On Mon, Feb 27, 2017 at 03:24:45PM +0900, Masahiro Yamada wrote:

> DTC 1.4.2 or later checks DT unit-address without reg property and
> vice-versa, and generates lots of warnings.  Fixing DT files will
> take for a while.  Until then, let's turn off the check unless
> building with W=*.
> 
> Introduce a new helper dtc-option to check if the option is supported
> in order to suppress warnings on older versions.
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro at socionext.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>
> Tested-by: Bin Meng <bmeng.cn at gmail.com>

Applied to u-boot/master, thanks!

-- 
Tom
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