linux-kernel - [PATCH] iommu: Use of_property_present() for testing DT property presence

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Message-Id: <20230310144709.1542910-1-robh@kernel.org>
Date:   Fri, 10 Mar 2023 08:47:09 -0600
From:   Rob Herring <robh@...nel.org>
To:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH] iommu: Use of_property_present() for testing DT property presence

It is preferred to use typed property access functions (i.e.
of_property_read_<type> functions) rather than low-level
of_get_property/of_find_property functions for reading properties. As
part of this, convert of_get_property/of_find_property calls to the
recently added of_property_present() helper when we just want to test
for presence of a property and nothing more.

Signed-off-by: Rob Herring <robh@...nel.org>
---
 drivers/iommu/arm/arm-smmu/arm-smmu.c | 2 +-
 drivers/iommu/ipmmu-vmsa.c            | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu.c b/drivers/iommu/arm/arm-smmu/arm-smmu.c
index 2ff7a72cf377..d0843caf8760 100644
--- a/drivers/iommu/arm/arm-smmu/arm-smmu.c
+++ b/drivers/iommu/arm/arm-smmu/arm-smmu.c
@@ -139,7 +139,7 @@ static int arm_smmu_register_legacy_master(struct device *dev,
 	int err;
 
 	np = dev_get_dev_node(dev);
-	if (!np || !of_find_property(np, "#stream-id-cells", NULL)) {
+	if (!np || !of_property_present(np, "#stream-id-cells")) {
 		of_node_put(np);
 		return -ENODEV;
 	}
diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
index bdf1a4e5eae0..f4470303d906 100644
--- a/drivers/iommu/ipmmu-vmsa.c
+++ b/drivers/iommu/ipmmu-vmsa.c
@@ -1014,7 +1014,7 @@ static int ipmmu_probe(struct platform_device *pdev)
 	 * the lack of has_cache_leaf_nodes flag or renesas,ipmmu-main property.
 	 */
 	if (!mmu->features->has_cache_leaf_nodes ||
-	    !of_find_property(pdev->dev.of_node, "renesas,ipmmu-main", NULL))
+	    !of_property_present(pdev->dev.of_node, "renesas,ipmmu-main"))
 		mmu->root = mmu;
 	else
 		mmu->root = ipmmu_find_root();
-- 
2.39.2