[PATCH v2 4/5] irqdomain: Introduce irq_domain_create_legacy() API

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

Introduce irq_domain_create_legacy() API which is functional equivalent
to the existing irq_domain_add_legacy(), but takes a pointer to the struct
fwnode_handle as a parameter.

Some users want to use it in non-OF cases.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
 Documentation/core-api/irq/irq-domain.rst |  6 ++++++
 include/linux/irqdomain.h                 |  6 ++++++
 kernel/irq/irqdomain.c                    | 17 ++++++++++++++---
 3 files changed, 26 insertions(+), 3 deletions(-)

diff --git a/Documentation/core-api/irq/irq-domain.rst b/Documentation/core-api/irq/irq-domain.rst
index 096db12f32d5..a77c24c27f7b 100644
--- a/Documentation/core-api/irq/irq-domain.rst
+++ b/Documentation/core-api/irq/irq-domain.rst
@@ -147,6 +147,7 @@ Legacy
 	irq_domain_add_simple()
 	irq_domain_add_legacy()
 	irq_domain_add_legacy_isa()
+	irq_domain_create_legacy()
 
 The Legacy mapping is a special case for drivers that already have a
 range of irq_descs allocated for the hwirqs.  It is used when the
@@ -185,6 +186,11 @@ that the driver using the simple domain call irq_create_mapping()
 before any irq_find_mapping() since the latter will actually work
 for the static IRQ assignment case.
 
+irq_domain_add_legacy() and irq_domain_create_legacy() are functionally
+equivalent, except for the first argument is different - the former
+accepts an Open Firmware specific 'struct device_node', while the latter
+accepts a more general abstraction 'struct fwnode_handle'.
+
 Hierarchy IRQ domain
 --------------------
 
diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index d21f75d294d7..77bf7d84c673 100644
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -271,6 +271,12 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 					 irq_hw_number_t first_hwirq,
 					 const struct irq_domain_ops *ops,
 					 void *host_data);
+struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
+					    unsigned int size,
+					    unsigned int first_irq,
+					    irq_hw_number_t first_hwirq,
+					    const struct irq_domain_ops *ops,
+					    void *host_data);
 extern struct irq_domain *irq_find_matching_fwspec(struct irq_fwspec *fwspec,
 						   enum irq_domain_bus_token bus_token);
 extern bool irq_domain_check_msi_remap(void);
diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 831526f2e728..9c9cb8829f7a 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -350,17 +350,28 @@ struct irq_domain *irq_domain_add_legacy(struct device_node *of_node,
 					 irq_hw_number_t first_hwirq,
 					 const struct irq_domain_ops *ops,
 					 void *host_data)
+{
+	return irq_domain_create_legacy(of_node_to_fwnode(of_node), size,
+					first_irq, first_hwirq, ops, host_data);
+}
+EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
+
+struct irq_domain *irq_domain_create_legacy(struct fwnode_handle *fwnode,
+					 unsigned int size,
+					 unsigned int first_irq,
+					 irq_hw_number_t first_hwirq,
+					 const struct irq_domain_ops *ops,
+					 void *host_data)
 {
 	struct irq_domain *domain;
 
-	domain = __irq_domain_add(of_node_to_fwnode(of_node), first_hwirq + size,
-				  first_hwirq + size, 0, ops, host_data);
+	domain = __irq_domain_add(fwnode, first_hwirq + size, first_hwirq + size, 0, ops, host_data);
 	if (domain)
 		irq_domain_associate_many(domain, first_irq, first_hwirq, size);
 
 	return domain;
 }
-EXPORT_SYMBOL_GPL(irq_domain_add_legacy);
+EXPORT_SYMBOL_GPL(irq_domain_create_legacy);
 
 /**
  * irq_find_matching_fwspec() - Locates a domain for a given fwspec
-- 
2.28.0