Re: [PATCH 4/4] [POWERPC] fsl_spi_init and users: stop using device_type = "spi"

Anton Vorontsov wrote:

I though about it. Is your device tree source out of tree? Otherwise
it should be trivial to upgrade the dtb, instead of producing cruft in
the kernel. I vote for less legacy code, but lets see what others will
say. So far count is 1:1. ;-)

I just want a transition period.  Whenever I write code that works with changes in the device tree, I always maintain compatibility with the older versions, and I was under the impression that this is policy.  If you update the device tree, you should update the kernel.  The converse, however, should not be true.

It would be really annoying if you had to swap out your device tree if you want to work with different kernel versions.

Maybe if the device tree compiler were part of the kernel, and every time you built the kernel it also built the dtb, I could accept locking the device tree and kernel versions.

-- 
Timur Tabi
Linux kernel developer at Freescale