linux-kernel - Re: [PATCH] checkpatch.pl: Add SPDX license tag check for dts files and headers

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Message-ID: <20170609135650.xypd22odmaqfkwfe@rob-hp-laptop>
Date:   Fri, 9 Jun 2017 08:56:50 -0500
From:   Rob Herring <robh@...nel.org>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Andy Whitcroft <apw@...onical.com>,
        Joe Perches <joe@...ches.com>
Subject: Re: [PATCH] checkpatch.pl: Add SPDX license tag check for dts files
 and headers

On Wed, Jun 07, 2017 at 05:45:03PM +0900, Masahiro Yamada wrote:
> Hi Rob,
> 
> 2017-02-24 0:56 GMT+09:00 Rob Herring <robh@...nel.org>:
> > Add a check for using SPDX-License-Identifier tags to define the license of
> > .dts{i} and DT header files rather than using free form license text. This
> > check looks for GPL, BSD, or X11(really incorrectly labeled MIT license)
> > license text which are the commonly used DT licenses.
> >
> > Signed-off-by: Rob Herring <robh@...nel.org>
> > Cc: Andy Whitcroft <apw@...onical.com>
> > Cc: Joe Perches <joe@...ches.com>
> 
> I have a question.
> 
> Is SPDX encouraged only for DT?
> 
> What should we do with C source files?

Depends on the maintainer and your lawyer I guess. gregkh is 
supportive[1]. I wouldn't recommend changing existing license text 
though.

Rob

[1] https://lkml.org/lkml/2017/2/15/968