From: Akhil R <akhilrajeev@nvidia.com>
Date: Fri, 28 Jan 2022 17:14:25 +0530
Subject: device property: Add fwnode_irq_get_byname
Git-commit: ca0acb511c21738b32386ce0f85c284b351d919e
Patch-mainline: v5.18-rc1
References: jsc#SLE-24569
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>
Acked-by: Ivan T. Ivanov <iivanov@suse.de>
---
drivers/base/property.c | 29 +++++++++++++++++++++++++++++
include/linux/property.h | 1 +
2 files changed, 30 insertions(+)
--- a/drivers/base/property.c
+++ b/drivers/base/property.c
@@ -944,6 +944,35 @@ int device_get_phy_mode(struct device *d
EXPORT_SYMBOL_GPL(device_get_phy_mode);
/**
+ * 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_irq_get - Get IRQ directly from a fwnode
* @fwnode: Pointer to the firmware node
* @index: Zero-based index of the IRQ
--- a/include/linux/property.h
+++ b/include/linux/property.h
@@ -120,6 +120,7 @@ struct fwnode_handle *fwnode_handle_get(
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);
unsigned int device_get_child_node_count(struct device *dev);