iommu: fix initialization without 'add_device' callback
IOMMU drivers can be initialized from of_iommu helpers. Such drivers don't need to provide device_add callbacks to operate properly, so there is no need to fail initialization if the callback is missing. Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
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@ -737,7 +737,7 @@ static int add_iommu_group(struct device *dev, void *data)
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const struct iommu_ops *ops = cb->ops;
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if (!ops->add_device)
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return -ENODEV;
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return 0;
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WARN_ON(dev->iommu_group);
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