[PATCH v5 01/10] clk: mediatek: Removed unused dpi_ck clock from MT8173
sboyd at codeaurora.org
Thu Jul 30 12:42:44 PDT 2015
On 07/30/2015 11:04 AM, Heiko Stübner wrote:
> Am Donnerstag, 30. Juli 2015, 10:36:43 schrieb Stephen Boyd:
>> Is it being used in DT right now and causing regressions on
>> v4.2-rcX? Sorry, I'm trying to understand why this patch matters
>> for the 4.2 release.
> it's not been used in an actual devicetree file, but as far as I understand it,
> the dt-binding headers themself are also part of the ABI.
> And it is new in 4.2, so has not been part of an official release yet.
> The reason for the removal from what I understand is that the removed clock is
> not documented at all (it's source, what it does), which got it the "clk_null"
> parent in the first place.
Right, so my understanding of the DT ABI thing is that newer kernels
should keep working with older DTs. If there isn't any DT using the
binding, then we don't have a problem because the only thing that could
happen would be a newer DT working with an older kernel, which doesn't
make any sense from a backwards incompatible standpoint.
If you feel strongly that some sort of DT ABI rule would be broken and
you want to make sure that doesn't happen I guess we can queue this up
to be sent off to Linus, but if you aren't worried (and I'm obviously
not worried) then I'd prefer we just queue it up for 4.3.
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