Re: [PATCH kernel] prom_init: Fetch flatten device tree from the system firmware

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Thu, 2019-05-30 at 14:37 -0500, Segher Boessenkool wrote:
> On Thu, May 30, 2019 at 05:09:06PM +1000, Alexey Kardashevskiy wrote:
> > so, it is sort-of nack from David and sort-of ack from Segher, what
> > happens now?
> 
> Maybe what we really need just a CI call to get all properties of a node
> at once?  Will that speed up things enough?
> 
> That way you need no change at all in lifetime of properties and how they
> are used, etc.; just a client getting the properties is a lot faster.

Hrm... if we're going to create a new interface, let's go for what we
need.

What we need is the FDT. It's a rather ubiquitous thing these days, it
makes sense to have a way to fetch an FDT directly from FW.

There is no use for the "fetch all properties" cases other than
building an FDT that any of us can think of, and it would create a more
complicated interface than just "fetch an FDT".

So I go for the simple one and agree with Alexey's idea.

Cheers,
Ben.