[PATCH v12 07/10] iommu/arm-smmu-v3: Add an arm_smmu_get_iort_node helper

[Nicolin Chen]

From: Jason Gunthorpe <jgg at nvidia.com>

This will be later used by Tegra241 CMDQV driver too.

Signed-off-by: Jason Gunthorpe <jgg at nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc at nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 5 +----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 8 ++++++++
 2 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index e764236a9216..6df3cb0bc406 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -4350,11 +4350,8 @@ static void acpi_smmu_get_options(u32 model, struct arm_smmu_device *smmu)
 static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 				      struct arm_smmu_device *smmu)
 {
+	struct acpi_iort_node *node = arm_smmu_get_iort_node(smmu);
 	struct acpi_iort_smmu_v3 *iort_smmu;
-	struct device *dev = smmu->dev;
-	struct acpi_iort_node *node;
-
-	node = *(struct acpi_iort_node **)dev_get_platdata(dev);
 
 	/* Retrieve SMMUv3 specific data */
 	iort_smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 71818f586036..9f5d156b73af 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -14,6 +14,8 @@
 #include <linux/mmzone.h>
 #include <linux/sizes.h>
 
+struct acpi_iort_node;
+
 /* MMIO registers */
 #define ARM_SMMU_IDR0			0x0
 #define IDR0_ST_LVL			GENMASK(28, 27)
@@ -791,6 +793,12 @@ static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
 extern struct xarray arm_smmu_asid_xa;
 extern struct mutex arm_smmu_asid_lock;
 
+static inline struct acpi_iort_node *
+arm_smmu_get_iort_node(struct arm_smmu_device *smmu)
+{
+	return *(struct acpi_iort_node **)dev_get_platdata(smmu->dev);
+}
+
 struct arm_smmu_domain *arm_smmu_domain_alloc(void);
 
 void arm_smmu_clear_cd(struct arm_smmu_master *master, ioasid_t ssid);
-- 
2.43.0