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    Subject[V4 PATCH 4/6] device property: Introduces device_dma_is_coherent()
    Date
    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>
    CC: Rafael J. Wysocki <rjw@rjwysocki.net>
    ---
    drivers/base/property.c | 12 ++++++++++++
    include/linux/property.h | 2 ++
    2 files changed, 14 insertions(+)

    diff --git a/drivers/base/property.c b/drivers/base/property.c
    index 1d0b116..8123c6e 100644
    --- a/drivers/base/property.c
    +++ b/drivers/base/property.c
    @@ -14,6 +14,7 @@
    #include <linux/export.h>
    #include <linux/kernel.h>
    #include <linux/of.h>
    +#include <linux/of_address.h>
    #include <linux/property.h>

    /**
    @@ -519,3 +520,14 @@ unsigned int device_get_child_node_count(struct device *dev)
    return count;
    }
    EXPORT_SYMBOL_GPL(device_get_child_node_count);
    +
    +bool device_dma_is_coherent(struct device *dev)
    +{
    + if (IS_ENABLED(CONFIG_OF) && dev->of_node)
    + return of_dma_is_coherent(dev->of_node);
    + else if (has_acpi_companion(dev))
    + return acpi_dma_is_coherent(acpi_node(dev->fwnode));
    +
    + return false;
    +}
    +EXPORT_SYMBOL_GPL(device_dma_is_coherent);
    diff --git a/include/linux/property.h b/include/linux/property.h
    index de8bdf4..76ebde9 100644
    --- a/include/linux/property.h
    +++ b/include/linux/property.h
    @@ -164,4 +164,6 @@ struct property_set {

    void device_add_property_set(struct device *dev, struct property_set *pset);

    +bool device_dma_is_coherent(struct device *dev);
    +
    #endif /* _LINUX_PROPERTY_H_ */
    --
    2.1.0


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