device property: Add fwnode_irq_get_byname

[ Upstream commit ca0acb511c21738b32386ce0f85c284b351d919e ]

Add fwnode_irq_get_byname() to get an interrupt by name from either
ACPI table or Device Tree, whichever is used for enumeration.

In the ACPI case, this allow us to use 'interrupt-names' in
_DSD which can be mapped to Interrupt() resource by index.
The implementation is similar to 'interrupt-names' in the
Device Tree.

Signed-off-by: Akhil R <akhilrajeev@nvidia.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Stable-dep-of: 8d3cefaf6592 ("i2c: core: Lock address during client device instantiation")
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/base/property.c b/drivers/base/property.c
index 87bb97e12749e673df497f387e3bbc24428f6b6f..ff1be3e311eebfdf1ecc2e656cf84fc238b4d97b 100644 (file)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -1066,6 +1066,35 @@ void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index)
 }
 EXPORT_SYMBOL(fwnode_iomap);
 
+/**
+ * fwnode_irq_get_byname - Get IRQ from a fwnode using its name
+ * @fwnode:    Pointer to the firmware node
+ * @name:      IRQ name
+ *
+ * Description:
+ * Find a match to the string @name in the 'interrupt-names' string array
+ * in _DSD for ACPI, or of_node for Device Tree. Then get the Linux IRQ
+ * number of the IRQ resource corresponding to the index of the matched
+ * string.
+ *
+ * Return:
+ * Linux IRQ number on success, or negative errno otherwise.
+ */
+int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name)
+{
+       int index;
+
+       if (!name)
+               return -EINVAL;
+
+       index = fwnode_property_match_string(fwnode, "interrupt-names",  name);
+       if (index < 0)
+               return index;
+
+       return fwnode_irq_get(fwnode, index);
+}
+EXPORT_SYMBOL(fwnode_irq_get_byname);
+
 /**
  * fwnode_graph_get_next_endpoint - Get next endpoint firmware node
  * @fwnode: Pointer to the parent firmware node

diff --git a/include/linux/property.h b/include/linux/property.h
index 032262e3d9991abc28f4adfc6dc3e0ad5cfcbc6c..840f0545d4f9da822880d180327f53f51747477e 100644 (file)
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -125,6 +125,7 @@ struct fwnode_handle *fwnode_handle_get(struct fwnode_handle *fwnode);
 void fwnode_handle_put(struct fwnode_handle *fwnode);
 
 int fwnode_irq_get(const struct fwnode_handle *fwnode, unsigned int index);
+int fwnode_irq_get_byname(const struct fwnode_handle *fwnode, const char *name);
 
 void __iomem *fwnode_iomap(struct fwnode_handle *fwnode, int index);