[PATCH 02/11] media: iris: Add iris vpu bus support and register it with iommu_buses

Vishnu Reddy
2026-04-14T05:00:43Z

From: Vikash Garodia <vikash.garodia@oss.qualcomm.com>

Add a dedicated iris VPU bus type and register it into the iommu_buses
list. Iris devices require their own bus so that each device can run its
own dma_configure() logic.

Signed-off-by: Vikash Garodia <vikash.garodia@oss.qualcomm.com>
Signed-off-by: Vishnu Reddy <busanna.reddy@oss.qualcomm.com>
---
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 61c12ba78206..d8ed6ef70ecd 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>
@@ -179,6 +180,9 @@ 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 2abbd3aeb4af..6f4052b98491 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 000000000000..b51bb4b82b0e
--- /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) 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)
+{
+ const u32 *f_id = dev_get_drvdata(dev);
+
+ if (!f_id)
+ return -ENODEV;
+
+ return of_dma_configure_id(dev, dev->parent->of_node, true, f_id);
+}
+
+const struct bus_type iris_vpu_bus_type = {
+ .name = "iris-vpu-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 000000000000..5704b226f7d6
--- /dev/null
+++ b/include/linux/iris_vpu_bus.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 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