path: root/drivers/base
diff options
authorMarcin Wojtas <mw@semihalf.com>2018-01-18 13:31:40 +0100
committerDavid S. Miller <davem@davemloft.net>2018-01-22 10:57:04 -0500
commit7c6c57f2ab2c5113844fe187a7c45c4bd76dc671 (patch)
tree41132234dab217c94395fed1f1d628ee4a6d6e73 /drivers/base
parentb28f263b86709a1e26d7207112030e970abf4aab (diff)
device property: Introduce fwnode_irq_get()
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 a 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. It is usable not only for the parents fwnodes, but also for the child nodes comprising their own _CRS methods with interrupts description. In order to be able o satisfy compilation with !CONFIG_ACPI and also simplify the new code, introduce a helper macro (ACPI_HANDLE_FWNODE), with which it is possible to reach an ACPI handle directly from its fwnode. Signed-off-by: Marcin Wojtas <mw@semihalf.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/base')
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/base/property.c b/drivers/base/property.c
index 7c4a53d20e6d..1d6c9d99d72f 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 +1231,31 @@ void *device_get_mac_address(struct device *dev, char *addr, int alen)
+ * 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 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_HANDLE_FWNODE(fwnode), index, &res);
+ if (ret)
+ return ret;
+ return res.start;
* 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

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