Am 14.05.2014 18:05, schrieb Grant Likely:
On Wed, May 14, 2014 at 4:02 PM, Alexander Holler <holler@xxxxxxxxxxxxx> wrote:
Am 14.05.2014 16:19, schrieb Grant Likely:
Rather than a dtb schema change, for the most common properties (irqs,
clocks, gpios), we could extract dependencies at boot time. I don't like
the idea of adding a separate depends-on property because it is very
easy to get it out of sync with the actual binding data (dtc is not the
only tool that manipulates .dtbs. Firmware will fiddle with it too).
Then that stuff has to fiddle correct. Sorry, but trying to solve all
problems right from the beginning just leads to endless talks with no end
and nothing will happen at all because nobody aggrees how to start.
I appreciate the problem that you're trying to solve and why you're
using the dtc approach. My job is to poke at the solution and make
sure it is going to be reliable. Making sure all users know how to
fiddle with the new property correctly is not a trivial problem,
especially when it is firmware that will not necessarily be updated.
The answer is just that they don't have to use this feature.
It is more meant as a long-term solution to fix for the problem of
increasing hard-coded workarounds which all are trying to fix the
initialization order of drivers. Hardware has become a lot more
complicated than it was in the good old days, and I think the time is
right trying to adopt the init-system to this new century instead of
still adding workarounds here and there.
I'm not saying flat out 'no' here, but before I merge anything, I have
to be reasonably certain that the feature is not going to represent a
maintenance nightmare over the long term.
The maintenance nightmare is already present in form of all the
workarounds which are trying to fix the initialzation order necessary
for modern hardware.
Regards,
Alexander
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