[PATCH v2 1/7] iommu/of: Respect disabled IOMMUs

On Fri, Jun 03, 2016 at 06:15:36PM +0100, Robin Murphy wrote:

If an IOMMU node is present in the DT but marked as disabled, we should
avoid trying to do anything with it. We currently sort-of get away with
this by virtue of a disabled device probably not having called
of_iommu_set_ops(), but that is hardly safe to rely upon in general, and
either way we don't want to treat it as an error condition with the
resulting "Failed to initialise IOMMU" message.

What's the use-case for this? I ask because epapr says that the device
binding should provide details as to exactly what "disabled" means for
that device.

Will