linux-kernel - [PATCH 5/8] iommu/arm-smmu: Don't register fwnode for legacy binding

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Message-Id: <01c68ef4d924d3671016690fa946eab306a1de07.1673978700.git.robin.murphy@arm.com>
Date:   Thu, 19 Jan 2023 19:18:23 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     joro@...tes.org, will@...nel.org
Cc:     hch@....de, jgg@...dia.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH 5/8] iommu/arm-smmu: Don't register fwnode for legacy binding

When using the legacy binding we bypass the of_xlate mechanism, so avoid
registering the instance fwnodes which act as keys for that. This will
help __iommu_probe_device() to retrieve the registered ops the same way
as for x86 etc. when no fwspec has previously been set up by of_xlate.

Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 719fbca1fe52..607f06af01b6 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -2156,7 +2156,8 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
 		return err;
 	}
 
-	err = iommu_device_register(&smmu->iommu, &arm_smmu_ops, dev);
+	err = iommu_device_register(&smmu->iommu, &arm_smmu_ops,
+				    using_legacy_binding ? NULL : dev);
 	if (err) {
 		dev_err(dev, "Failed to register iommu\n");
 		iommu_device_sysfs_remove(&smmu->iommu);
-- 
2.36.1.dirty