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device property: Introduces device_dma_is_coherent()

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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>
This commit is contained in:
Suthikulpanit, Suravee 2015-06-10 11:08:54 -05:00 committed by Rafael J. Wysocki
parent b6197b93fa
commit 05ca556003
2 changed files with 16 additions and 0 deletions
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14
drivers/base/property.c
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@ -14,6 +14,7 @@
#include <linux/export.h> #include <linux/export.h>
#include <linux/kernel.h> #include <linux/kernel.h>
#include <linux/of.h> #include <linux/of.h>
#include <linux/of_address.h>
#include <linux/property.h> #include <linux/property.h>
/** /**
@ -519,3 +520,16 @@ unsigned int device_get_child_node_count(struct device *dev)
return count; return count;
} }
EXPORT_SYMBOL_GPL(device_get_child_node_count); EXPORT_SYMBOL_GPL(device_get_child_node_count);
bool device_dma_is_coherent(struct device *dev)
{
bool coherent = false;
if (IS_ENABLED(CONFIG_OF) && dev->of_node)
coherent = of_dma_is_coherent(dev->of_node);
else
acpi_check_dma(ACPI_COMPANION(dev), &coherent);
return coherent;
}
EXPORT_SYMBOL_GPL(device_dma_is_coherent);

2
include/linux/property.h
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@ -164,4 +164,6 @@ struct property_set {
void device_add_property_set(struct device *dev, struct property_set *pset); void device_add_property_set(struct device *dev, struct property_set *pset);
bool device_dma_is_coherent(struct device *dev);
#endif /* _LINUX_PROPERTY_H_ */ #endif /* _LINUX_PROPERTY_H_ */