Re: [PATCHv3 14/19] iommu/tegra: smmu: Get "nvidia,memory-clients" from DT

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On Thu, Oct 31, 2013 at 07:25:25PM +0000, Stephen Warren wrote:
> On 10/31/2013 01:16 PM, Stephen Warren wrote:
> > Hmm. That's interesting. I see that the ARM SMMU has a list of the
> > clients it affects, whereas this Tegra series puts information into each
> > client device about the SMMU(s) that affect it. Is it better to flip the
> > Tegra binding around to match the style of the ARM SMMU?
> 
> One question here: How do you ensure that the SMMU driver probe()s
> before probe() runs for devices affected by the SMMU?

I think we get away with this by virtue of nobody actually creating IOMMU
mappings from within drivers, so the ordering is already handled. However, I
also have a patch queued to move the SMMU initialisation to a
subsys_initcall. I'm not particularly fond of that, but it seems to be the
done thing (even for other architectures).

Will
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