On Wed, 3 Nov 2021 at 17:27, Jae Hyun Yoo [off-list ref] wrote:

On 11/3/2021 9:29 AM, Rob Herring wrote:

quoted

It's possible that 'clocks' was always required or that it never
worked without clocks, then this change is okay. Looking at this
patch, I have no way to know that. The commit message has to explain
that. A commit message needs to answer WHY are you making the change.
You don't really need WHAT the change is as anyone can read the diff.

Then what would be better? Would it be good enough if I add more detail
commit message including a note that dtb recompiling is required? Or,
should I change this series to treat the 'clocks' as an optional
property? Can you please share your thought?

Make it essential. It was only by accident that things have worked
without this change.

While keeping backwards compatibility with dtbs is a goal we strive
for, in practice we use the dtb from the corresponding kernel source
tree, so as long as the patch to the driver is applied in the same
place as the patch to the device tree no systems will break.