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 ;-) > > Moritz > Yes, I can just take out the two sentences that refer to overlays and just leave: A Simple FPGA Bus is a bus that handles configuring an FPGA and its bridges before populating the devices below its node. Alan -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
