Re: [PATCHv3 01/19] [HACK] of: dev_node has struct device pointer

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On Thu, 31 Oct 2013 18:53:22 +0100
Stephen Warren <swarren@xxxxxxxxxxxxx> wrote:
...
> We're talking about memory-mapped on-SoC devices here, that generally
> only exist inside Tegra SoCs.
> 
> Even ignoring that (i.e. expanding the argument to arbitrary modules),
> having drivers that perform bus-master transactions call a function
> of_iommu_attach() or similar, which does nothing if the device isn't
> behind an IOMMU but otherwise does whatever is required, seems like it
> isn't much of an imposition.

Where do you expect of_iommu_attach() to be called?
I thought something below:

	Modified drivers/base/dd.c
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 35fa368..92ec2e9 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -278,6 +278,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
 	if (ret)
 		goto probe_failed;
 
+	ret = of_iommu_attach(dev);
+	if (ret)
+		goto probe_failed;
+
 	if (driver_sysfs_add(dev)) {
 		printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n",
 			__func__, dev_name(dev));

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