On Thu, Jan 28, 2016 at 03:17:33PM +0100, Arnd Bergmann wrote:

On Thursday 28 January 2016 12:20:58 Robin Murphy wrote:

quoted

quoted

Will, Robin, thoughts?

Any IDs specified here would only apply to DMA by the "platform device" 
side of the host controller itself (as would an equivalent "iommus" 
property on pcie0 once I finish the SMMUv2 generic binding support I'm 
working on). In terms of PCI devices, the "mmu-masters" property is 
overloaded such that only its existence matters, to identify that there 
_is_ a relationship between the SMMU and the PCI bus(es) behind that 
host controller.

I wasn't aware that this was actually still specified. I had hoped
we were getting rid of mmu-masters before anyone actually started
using it, but now I see it in ns2.dtsi and fsl-ls2080a.dtsi.

Does anyone know what happened to the plan to use the iommu DT binding
for the ARM SMMU instead? Do we now have to support both ways indefinitely?

We always did -- Seattle used the mmu-masters binding before the generic
binding even existed. Robin has been working on patches to get of_xlate
up and running, but it got held up by Laurent's series which didn't end
up going anywhere.

Will