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device property: Introduces device_dma_is_coherent()
Currently, device drivers, which support both OF and ACPI, need to call two separate APIs, of_dma_is_coherent() and acpi_dma_is_coherent()) to determine device coherency attribute. This patch simplifies this process by introducing a new device property API, device_dma_is_coherent(), which calls the appropriate interface based on the booting architecture. Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
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2 changed files with 16 additions and 0 deletions
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@ -14,6 +14,7 @@
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/property.h>
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/**
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@ -519,3 +520,16 @@ unsigned int device_get_child_node_count(struct device *dev)
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return count;
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}
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EXPORT_SYMBOL_GPL(device_get_child_node_count);
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bool device_dma_is_coherent(struct device *dev)
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{
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bool coherent = false;
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if (IS_ENABLED(CONFIG_OF) && dev->of_node)
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coherent = of_dma_is_coherent(dev->of_node);
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else
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acpi_check_dma(ACPI_COMPANION(dev), &coherent);
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return coherent;
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}
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EXPORT_SYMBOL_GPL(device_dma_is_coherent);
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@ -164,4 +164,6 @@ struct property_set {
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void device_add_property_set(struct device *dev, struct property_set *pset);
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bool device_dma_is_coherent(struct device *dev);
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#endif /* _LINUX_PROPERTY_H_ */
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