Until now there were two very similar functions allowing
to get Linux IRQ number from ACPI handle (acpi_irq_get())
and OF node (of_irq_get()). The first one appeared to be used
only as a subroutine of platform_irq_get(), which (in the generic
code) limited IRQ obtaining from _CRS method only to nodes
associated to kernel's struct platform_device.
This patch introduces new helper routine - fwnode_irq_get(),
which allows to get the IRQ number directly from the fwnode
to be used as common for OF/ACPI worlds.
Signed-off-by: Marcin Wojtas <mw@xxxxxxxxxxxx>
---
drivers/base/property.c | 27 ++++++++++++++++++++
include/linux/property.h | 2 ++
2 files changed, 29 insertions(+)
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 7c4a53d..adb3893 100644
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -16,6 +16,7 @@
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_graph.h>
+#include <linux/of_irq.h>
#include <linux/property.h>
#include <linux/etherdevice.h>
#include <linux/phy.h>
@@ -1230,6 +1231,32 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen)
EXPORT_SYMBOL(device_get_mac_address);
/**
+ * fwnode_irq_get - Get IRQ directly from a fwnode
+ * @fwnode: Pointer to the firmware node
+ * @index: Zero-based index of the IRQ
+ *
+ * Returns Linux IRQ number on success. Other values are determined
+ * accordingly to acpi_/of_ irq_get() operation.
+ */
+int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index)
+{
+ struct acpi_device *adev = to_acpi_device_node(fwnode);
+ struct device_node *of_node = to_of_node(fwnode);
+ struct resource res;
+ int ret;
+
+ if (IS_ENABLED(CONFIG_OF) && of_node)
+ return of_irq_get(of_node, index);
+
+ ret = acpi_irq_get(acpi_device_handle(adev), index, &res);
+ if (ret)
+ return ret;
+
+ return res.start;
+}
+EXPORT_SYMBOL(fwnode_irq_get);
+
+/**
* device_graph_get_next_endpoint - Get next endpoint firmware node
* @fwnode: Pointer to the parent firmware node
* @prev: Previous endpoint node or %NULL to get the first
diff --git a/include/linux/property.h b/include/linux/property.h
index 9b13332..e05889f 100644
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -103,6 +103,8 @@ struct fwnode_handle *device_get_named_child_node(struct device *dev,
struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
void fwnode_handle_put(struct fwnode_handle *fwnode);
+int fwnode_irq_get(struct fwnode_handle *fwnode, unsigned int index);
+
unsigned int device_get_child_node_count(struct device *dev);
static inline bool device_property_read_bool(struct device *dev,
--
2.7.4
--
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