Re: [GIT PULL] RISC-V Sophgo Devicetrees for v7.1

On Thu, Apr 02, 2026 at 11:43:43PM +0200, Arnd Bergmann wrote:
> On Thu, Apr 2, 2026, at 04:39, Chen Wang wrote:
> > For CV18xx serials:
> > Just a minor patch to replace the compatible for
> > dma-controller to allow setting DMA channel number.
> > New bindings and driver part change are picked by
> > DMA subsytem and this patch handles the left dts
> > part change.
> >
> > Signed-off-by: Chen Wang <[email protected]>
> >
> > ----------------------------------------------------------------
> > Inochi Amaoto (1):
> >        riscv: dts: sophgo: cv180x: Allow the DMA multiplexer to set 
> > channel number for DMA controller
> 
> Doesn't this change break backwards compatibility with
> all existing kernels?
> 

It will break if a old kernel with the new dtb. But I
think this will break nothing since the DMA device is not
used by any devices in the old DTB. And if a user force
the some device with DMA in the old version, it is just
not functional and lead to a broken system.

> I did not take this one for now, need clarification, or
> a new patch that keeps the old compatible string along
> with the new one, if that is possible.
> 
>        Arnd

Regards,
Inochi