Date:   Mon, 6 Dec 2021 06:47:45 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     Jason Gunthorpe <jgg@nvidia.com>
Cc:     Christoph Hellwig <hch@infradead.org>,
        Stuart Yoder <stuyoder@gmail.com>, rafael@kernel.org,
        David Airlie <airlied@linux.ie>, linux-pci@vger.kernel.org,
        Thierry Reding <thierry.reding@gmail.com>,
        Diana Craciun <diana.craciun@oss.nxp.com>,
        Dmitry Osipenko <digetx@gmail.com>,
        Will Deacon <will@kernel.org>, Ashok Raj <ashok.raj@intel.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Kevin Tian <kevin.tian@intel.com>,
        Chaitanya Kulkarni <kch@nvidia.com>,
        Alex Williamson <alex.williamson@redhat.com>,
        kvm@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Cornelia Huck <cohuck@redhat.com>,
        linux-kernel@vger.kernel.org, Li Yang <leoyang.li@nxp.com>,
        iommu@lists.linux-foundation.org,
        Jacob jun Pan <jacob.jun.pan@intel.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH v3 03/18] driver core: platform: Rename
 platform_dma_configure()
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 <Ya3BYxrgkNK3kbGI@kroah.com>
 <Ya4abbx5M31LYd3N@infradead.org>
 <20211206144535.GB4670@nvidia.com>
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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.