[PATCH] iommu/arm-smmu: Update impl quirks comment

* [PATCH] iommu/arm-smmu: Update impl quirks comment
@ 2020-06-24 10:24 Robin Murphy
  2020-07-08 22:02 ` Will Deacon
  0 siblings, 1 reply; 2+ messages in thread
From: Robin Murphy @ 2020-06-24 10:24 UTC (permalink / raw)
  To: will, joro; +Cc: iommu, linux-arm-kernel

The comment about implementation and integration quirks being
mutually-exclusive is out of date, and in fact the code is already
structured for the case it anticipates, so document that properly.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
---
 drivers/iommu/arm-smmu-impl.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm-smmu-impl.c b/drivers/iommu/arm-smmu-impl.c
index c75b9d957b70..1fb4bb994dbf 100644
--- a/drivers/iommu/arm-smmu-impl.c
+++ b/drivers/iommu/arm-smmu-impl.c
@@ -153,10 +153,9 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
 	const struct device_node *np = smmu->dev->of_node;
 
 	/*
-	 * We will inevitably have to combine model-specific implementation
-	 * quirks with platform-specific integration quirks, but everything
-	 * we currently support happens to work out as straightforward
-	 * mutually-exclusive assignments.
+	 * Set the impl for model-specific implementation quirks first,
+	 * such that platform integration quirks can pick it up and
+	 * inherit from it if necessary.
 	 */
 	switch (smmu->model) {
 	case ARM_MMU500:
@@ -168,6 +167,7 @@ struct arm_smmu_device *arm_smmu_impl_init(struct arm_smmu_device *smmu)
 		break;
 	}
 
+	/* This is implicitly MMU-400 */
 	if (of_property_read_bool(np, "calxeda,smmu-secure-config-access"))
 		smmu->impl = &calxeda_impl;
 
-- 
2.23.0.dirty

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