Stephen Warren <[email protected]> writes: > On 05/30/2014 05:20 AM, Hiroshi Doyu wrote: >> The later Tegra SoC(>= T124) has more registers for >> MC_SMMU_TRANSLATION_ENABLE_*. Now those info is provided as platfrom >> data. If those varies a lot on SoCs in the future, we can consider >> putting them into DT later. > >> diff --git a/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt >> b/Documentation/devicetree/bindings/iommu/nvidia,tegra30-smmu.txt > >> Required properties: >> -- compatible : "nvidia,tegra30-smmu" >> -- reg : Should contain 3 register banks(address and length) for each >> +- compatible : "nvidia,tegra124-smmu", "nvidia,tegra30-smmu" >> +- reg : Can contain multiple register banks(address and length) for each >> of the SMMU register blocks. > > How many is "multiple"? This seems like rather a weak definition of how > many entries are expected. What are the different register banks?
SMMU registers are part of MC registers. SMMU registeres are interleaved by MC(non-SMMU) registeres, most likely it's about ~10 banks. We concluded to not have SMMU as a child of MC since their features are so independent long time ago. This interleaved register locations are not so good. I requested H/W team to have them completely separated, but itt was too late to change. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
