[alsa-devel] [PATCH] ASoC: fsl_ssi: Remove unneeded 'i2s-slave' property

[Timur Tabi]

Nicolin Chen wrote:
>> You can't just redefine a property, because that breaks backwards
>> >compatibility with older device trees or older kernels.

> Sorry, I'm not sure what's the problem here. It just drops i2s stuff
> and leave AC97 part as we discussed. Why would old DTs be broken?
> Is that possible for you to give me an example to understand the
> point?

If you have an older kernel with a newer device tree (that doesn't have 
"i2s-mode"), the driver will fail to load because "i2s-mode" is missing.