linux-kernel - Re: [PATCH v3 03/18] driver core: platform: Rename platform_dma

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Date:   Tue, 7 Dec 2021 15:09:28 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     Jason Gunthorpe <jgg@...dia.com>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Stuart Yoder <stuyoder@...il.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Linux PCI <linux-pci@...r.kernel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Diana Craciun <diana.craciun@....nxp.com>,
        Dmitry Osipenko <digetx@...il.com>,
        Will Deacon <will@...nel.org>, Ashok Raj <ashok.raj@...el.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Kevin Tian <kevin.tian@...el.com>,
        Chaitanya Kulkarni <kch@...dia.com>,
        Alex Williamson <alex.williamson@...hat.com>,
        KVM list <kvm@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Cornelia Huck <cohuck@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Li Yang <leoyang.li@....com>,
        "open list:DMA MAPPING HELPERS" <iommu@...ts.linux-foundation.org>,
        Jacob jun Pan <jacob.jun.pan@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH v3 03/18] driver core: platform: Rename platform_dma_configure()

On Mon, Dec 6, 2021 at 7:04 AM Jason Gunthorpe <jgg@...dia.com> wrote:
>
> On Mon, Dec 06, 2021 at 06:47:45AM -0800, Christoph Hellwig wrote:
> > On Mon, Dec 06, 2021 at 10:45:35AM -0400, Jason Gunthorpe via iommu wrote:
> > > IIRC the only thing this function does is touch ACPI and OF stuff?
> > > Isn't that firmware?
> > >
> > > AFAICT amba uses this because AMBA devices might be linked to DT
> > > descriptions?
> >
> > But DT descriptions aren't firmware.  They are usually either passed onb
> > the bootloader or in some deeply embedded setups embedded into the
> > kernel image.
>
> Pedenatically yes, but do you know of a common word to refer to both
> OF and ACPI that is better than firmware? :)
>
> AFAICT we already use firwmare for this in a few places, eg
> fwnode_handle and so on.

I've always thought 'platform' was the generic name for otherwise
non-enumerable platform-firmware/data things enumerated by ACPI / OF.