Re: [PATCH v12 2/6] fpga: add bindings document for simple fpga bus
Date: Wed Oct 28 2015 - 11:42:07 EST
On Wed, 28 Oct 2015, Moritz Fischer wrote:
> On Wed, Oct 28, 2015 at 7:53 AM, atull <atull@xxxxxxxxxxxxxxxxxxxxx> wrote:
> >> > +A Simple FPGA Bus is a bus that handles configuring an FPGA and its bridges
> >> > +before populating the devices below its node. All this happens when a device
> >> > +tree overlay is added to the live tree. This document describes that device
> >> > +tree overlay.
> >> > +
> >> This is not really true, is it?
> >> The driver should work without applying the overlay, e.g. the bootloader
> >> might have already done it.
> > Yes it's true. I'm not clear what you are saying. If the bootloader has
> > programmed the FPGA, the overlay can leave out the optional properties
> > and the FPGA won't get reprogrammed; the child devices will still get
> > added and probed. So this handles both the case where you want to reprogram
> > the FPGA under Linux and where the FPGA was programmed by a bootloader.
> I think what he means is that the document explicitly calls out the overlay,
> when in theory it also works without an overlay. While being the most 'natural'
> use-case, it is not the only one ;-)
Yes, I can just take out the two sentences that refer to overlays and just
A Simple FPGA Bus is a bus that handles configuring an FPGA and its bridges
before populating the devices below its node.
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