[PATCH V7 2/4] iommu/arm-smmu-v3: Add device-tree support for CMDQV driver
From: Ashish Mhetre <hidden>
Date: 2025-12-15 06:48:44
Also in:
linux-devicetree, linux-iommu, linux-tegra, lkml
Subsystem:
arm smmu drivers, iommu subsystem, the rest · Maintainers:
Will Deacon, Joerg Roedel, Linus Torvalds
Add device tree support to the CMDQV driver to enable usage on Tegra264 SoCs. The implementation parses the nvidia,cmdqv phandle from the SMMU device tree node to associate each SMMU with its corresponding CMDQV instance based on compatible string. Reviewed-by: Nicolin Chen <redacted> Signed-off-by: Ashish Mhetre <redacted> --- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 32 +++++++++++++++++++++ 1 file changed, 32 insertions(+)
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 dad3c0cb800b..0cd0013200f3 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c@@ -4530,6 +4530,35 @@ static int arm_smmu_device_hw_probe(struct arm_smmu_device *smmu) return 0; } +#ifdef CONFIG_TEGRA241_CMDQV +static void tegra_cmdqv_dt_probe(struct device_node *smmu_node, + struct arm_smmu_device *smmu) +{ + struct platform_device *pdev; + struct device_node *np; + + np = of_parse_phandle(smmu_node, "nvidia,cmdqv", 0); + if (!np) + return; + + /* Tegra241 CMDQV driver is responsible for put_device() */ + pdev = of_find_device_by_node(np); + of_node_put(np); + if (!pdev) + return; + + smmu->impl_dev = &pdev->dev; + smmu->options |= ARM_SMMU_OPT_TEGRA241_CMDQV; + dev_info(smmu->dev, "found companion CMDQV device: %s\n", + dev_name(smmu->impl_dev)); +} +#else +static void tegra_cmdqv_dt_probe(struct device_node *smmu_node, + struct arm_smmu_device *smmu) +{ +} +#endif + #ifdef CONFIG_ACPI #ifdef CONFIG_TEGRA241_CMDQV static void acpi_smmu_dsdt_probe_tegra241_cmdqv(struct acpi_iort_node *node,
@@ -4635,6 +4664,9 @@ static int arm_smmu_device_dt_probe(struct platform_device *pdev, if (of_dma_is_coherent(dev->of_node)) smmu->features |= ARM_SMMU_FEAT_COHERENCY; + if (of_device_is_compatible(dev->of_node, "nvidia,tegra264-smmu")) + tegra_cmdqv_dt_probe(dev->of_node, smmu); + return ret; }
--
2.25.1