From ca0acb511c21738b32386ce0f85c284b351d919e Mon Sep 17 00:00:00 2001 From: Akhil R Date: Fri, 28 Jan 2022 17:14:25 +0530 Subject: [PATCH] device property: Add fwnode_irq_get_byname 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 Reviewed-by: Andy Shevchenko Acked-by: Rafael J. Wysocki Signed-off-by: Wolfram Sang --- drivers/base/property.c | 29 +++++++++++++++++++++++++++++ include/linux/property.h | 1 + 2 files changed, 30 insertions(+) diff --git a/drivers/base/property.c b/drivers/base/property.c index e6497f6..fc59e0f 100644 --- a/drivers/base/property.c +++ b/drivers/base/property.c @@ -936,6 +936,35 @@ 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 * @prev: Previous endpoint node or %NULL to get the first diff --git a/include/linux/property.h b/include/linux/property.h index 7399a0b..95d56a5 100644 --- a/include/linux/property.h +++ b/include/linux/property.h @@ -121,6 +121,7 @@ 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); -- 2.7.4