[PATCH 7/9] documentation: iommu: add description of ARM System MMU binding
Joerg Roedel
joro at 8bytes.org
Fri Jun 21 06:08:45 EST 2013
On Mon, Jun 10, 2013 at 07:34:43PM +0100, Will Deacon wrote:
> This patch adds a description of the device tree binding for the ARM
> System MMU architecture.
Interesting, will this be a common driver to replace existing ARM IOMMU
drivers or is it a common driver for ARM IOMMUs found in future chips?
> +- smmu-parent : When multiple SMMUs are chained together, this
> + property can be used to provide a phandle to the
> + parent SMMU (that is the next SMMU on the path going
> + from the mmu-masters towards memory) node for this
> + SMMU.
What happens when SMMUs are chained? Will the second SMMU seeing the DMA
just pass it through or is it translated again?
Thanks,
Joerg
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