Re: Question regarding back compatibility for DT

On Tue, Mar 21, 2017 at 11:27:37AM -0500, Rob Herring wrote:

On Tue, Mar 21, 2017 at 10:58 AM, Daniel Lezcano
[off-list ref] wrote:

quoted

Hi Rob, dt people,

is it acceptable a driver is changed using a new DT binding but becomes
incompatible with the old DT files ?

IOW, is it possible to change the DT and the driver without supporting the old
DT format, forcing an update of the DT and the kernel ?

If you want a global rule, then no it is not okay. However, it depends
on the platform and it's users. I just ask that breaking compatibility
and why is highlighted in the commit message and the platform
maintainer is okay with it.

Thanks for the clarification. I will ask the maintainer if breaking the
compatibility is ok.

That shows how important is to wisely choose the right binding.

  -- Daniel


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