[PATCH v2 3/7] media: iris: add iris vpu bus support and register it with iommu_buses

[Vikash Garodia]

Add iris vpu bus support and hooks the new bus into the iommu_buses
list. Iris devices need their own bus so that each iris device can run
its own dma_configure() logic.

Co-developed-by: Vishnu Reddy <busanna.reddy@xxxxxxxxxxxxxxxx>
Signed-off-by: Vishnu Reddy <busanna.reddy@xxxxxxxxxxxxxxxx>
Signed-off-by: Vikash Garodia <vikash.garodia@xxxxxxxxxxxxxxxx>
---
 drivers/iommu/iommu.c                           |  4 ++++
 drivers/media/platform/qcom/iris/Makefile       |  4 ++++
 drivers/media/platform/qcom/iris/iris_vpu_bus.c | 32 +++++++++++++++++++++++++
 include/linux/iris_vpu_bus.h                    | 13 ++++++++++
 4 files changed, 53 insertions(+)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 35db5178095404fec87cd0f18e44ea97cf354e78..fd5fb7c10da22ab548d359ca1f44504acc3d646c 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -13,6 +13,7 @@
 #include <linux/bug.h>
 #include <linux/types.h>
 #include <linux/init.h>
+#include <linux/iris_vpu_bus.h>
 #include <linux/export.h>
 #include <linux/slab.h>
 #include <linux/errno.h>
@@ -178,6 +179,9 @@ static const struct bus_type * const iommu_buses[] = {
 #ifdef CONFIG_CDX_BUS
 	&cdx_bus_type,
 #endif
+#if IS_ENABLED(CONFIG_VIDEO_QCOM_IRIS)
+	&iris_vpu_bus_type,
+#endif
 };
 
 /*
diff --git a/drivers/media/platform/qcom/iris/Makefile b/drivers/media/platform/qcom/iris/Makefile
index 2abbd3aeb4af07e52bf372a4b2f352463529c92c..6f4052b98491aeddc299669334d4c93e9a3420e4 100644
--- a/drivers/media/platform/qcom/iris/Makefile
+++ b/drivers/media/platform/qcom/iris/Makefile
@@ -31,3 +31,7 @@ qcom-iris-objs += iris_platform_gen1.o
 endif
 
 obj-$(CONFIG_VIDEO_QCOM_IRIS) += qcom-iris.o
+
+ifdef CONFIG_VIDEO_QCOM_IRIS
+obj-y += iris_vpu_bus.o
+endif
diff --git a/drivers/media/platform/qcom/iris/iris_vpu_bus.c b/drivers/media/platform/qcom/iris/iris_vpu_bus.c
new file mode 100644
index 0000000000000000000000000000000000000000..34ce78d9b0ff1feda15ba4f060a56d02749a0858
--- /dev/null
+++ b/drivers/media/platform/qcom/iris/iris_vpu_bus.c
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2026 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/device.h>
+#include <linux/of_device.h>
+
+#include "iris_platform_common.h"
+
+static int iris_vpu_bus_dma_configure(struct device *dev)
+{
+	struct iris_context_bank *cb = dev_get_drvdata(dev);
+
+	if (!cb)
+		return -ENODEV;
+
+	return of_dma_configure_id(dev, dev->parent->of_node, true, &cb->f_id);
+}
+
+const struct bus_type iris_vpu_bus_type = {
+	.name = "iris-bus",
+	.dma_configure = iris_vpu_bus_dma_configure,
+};
+EXPORT_SYMBOL_GPL(iris_vpu_bus_type);
+
+static int __init iris_vpu_bus_init(void)
+{
+	return bus_register(&iris_vpu_bus_type);
+}
+
+postcore_initcall(iris_vpu_bus_init);
diff --git a/include/linux/iris_vpu_bus.h b/include/linux/iris_vpu_bus.h
new file mode 100644
index 0000000000000000000000000000000000000000..8aba472fcadd269e196b7243da5660deaff31abb
--- /dev/null
+++ b/include/linux/iris_vpu_bus.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
+ * Copyright (c) 2026 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#ifndef __IRIS_VPU_BUS_H__
+#define __IRIS_VPU_BUS_H__
+
+#if IS_ENABLED(CONFIG_VIDEO_QCOM_IRIS)
+extern const struct bus_type iris_vpu_bus_type;
+#endif
+
+#endif /* __IRIS_VPU_BUS_H__ */

-- 
2.34.1