iommu/arm-smmu-v3: Add acpi_smmu_iort_probe_model for impl

For model-specific implementation, repurpose the acpi_smmu_get_options()
to a wider acpi_smmu_acpi_probe_model(). A new model can add to the list
in this new function.

Suggested-by: Will Deacon <will@kernel.org>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Link: https://lore.kernel.org/r/79716299829aeab2e55b8c7932f2634b209bb4d5.1724970714.git.nicolinc@nvidia.com
Signed-off-by: Will Deacon <will@kernel.org>

Author: nicolinc

drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

@@ -4341,18 +4341,25 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu)
 }
 
 #ifdef CONFIG_ACPI
-static void acpi_smmu_get_options(u32 model, struct arm_smmu_device *smmu)
+static int acpi_smmu_iort_probe_model(struct acpi_iort_node *node,
+				      struct arm_smmu_device *smmu)
 {
-	switch (model) {
+	struct acpi_iort_smmu_v3 *iort_smmu =
+		(struct acpi_iort_smmu_v3 *)node->node_data;
+
+	switch (iort_smmu->model) {
 	case ACPI_IORT_SMMU_V3_CAVIUM_CN99XX:
 		smmu->options |= ARM_SMMU_OPT_PAGE0_REGS_ONLY;
 		break;
 	case ACPI_IORT_SMMU_V3_HISILICON_HI161X:
 		smmu->options |= ARM_SMMU_OPT_SKIP_PREFETCH;
 		break;
+	case ACPI_IORT_SMMU_V3_GENERIC:
+		break;
 	}
 
 	dev_notice(smmu->dev, "option mask 0x%x\n", smmu->options);
+	return 0;
 }
 
 static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
@@ -4367,8 +4374,6 @@ static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 	/* Retrieve SMMUv3 specific data */
 	iort_smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
 
-	acpi_smmu_get_options(iort_smmu->model, smmu);
-
 	if (iort_smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE)
 		smmu->features |= ARM_SMMU_FEAT_COHERENCY;
 
@@ -4380,7 +4385,7 @@ static int arm_smmu_device_acpi_probe(struct platform_device *pdev,
 		smmu->features |= ARM_SMMU_FEAT_HA;
 	}
 
-	return 0;
+	return acpi_smmu_iort_probe_model(node, smmu);
 }
 #else
 static inline int arm_smmu_device_acpi_probe(struct platform_device *pdev,