Re: [RFC PATCH v1 0/6] Resolve unwanted DMA backing with IOMMU

From: Rob Herring
Date: Fri Jul 27 2018 - 13:13:46 EST

On Fri, Jul 27, 2018 at 8:20 AM Joerg Roedel <joro@xxxxxxxxxx> wrote:
> On Fri, Jul 27, 2018 at 05:10:22PM +0300, Dmitry Osipenko wrote:
> > I'm not sure what you guys are meaning by the "firmware", could you elaborate
> > please? Do you mean the Open Firmware and hence the devicetree or what?
> Yes, I think the best way to request this is using a device-tree
> property. Letting the device driver request it is definitly a bad idea.

I don't follow why we need a property rather than being implied by the
device's (the GPU) compatible string.