genirq: Introduce irq_domain_translate_onecell

Add a new function irq_domain_translate_onecell() that is to be used as
the translate function in struct irq_domain_ops.

Signed-off-by: Yash Shah <yash.shah@sifive.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/1575976274-13487-2-git-send-email-yash.shah@sifive.com

diff --git a/include/linux/irqdomain.h b/include/linux/irqdomain.h
index 3c340dbc5a1ffe814c819b95fc100b2020375f8d..698749f42cede798af409cddc2f3575210127f2c 100644 (file)
--- a/include/linux/irqdomain.h
+++ b/include/linux/irqdomain.h
@@ -427,6 +427,11 @@ int irq_domain_translate_twocell(struct irq_domain *d,
                                 unsigned long *out_hwirq,
                                 unsigned int *out_type);
 
+int irq_domain_translate_onecell(struct irq_domain *d,
+                                struct irq_fwspec *fwspec,
+                                unsigned long *out_hwirq,
+                                unsigned int *out_type);
+
 /* IPI functions */
 int irq_reserve_ipi(struct irq_domain *domain, const struct cpumask *dest);
 int irq_destroy_ipi(unsigned int irq, const struct cpumask *dest);

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index dd822fd8a7d5b7d308b997eccbd9c58410091b69..7a8808c8dfec5627f1720b7be150b4dd4ae9a28d 100644 (file)
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -986,6 +986,23 @@ const struct irq_domain_ops irq_domain_simple_ops = {
 };
 EXPORT_SYMBOL_GPL(irq_domain_simple_ops);
 
+/**
+ * irq_domain_translate_onecell() - Generic translate for direct one cell
+ * bindings
+ */
+int irq_domain_translate_onecell(struct irq_domain *d,
+                                struct irq_fwspec *fwspec,
+                                unsigned long *out_hwirq,
+                                unsigned int *out_type)
+{
+       if (WARN_ON(fwspec->param_count < 1))
+               return -EINVAL;
+       *out_hwirq = fwspec->param[0];
+       *out_type = IRQ_TYPE_NONE;
+       return 0;
+}
+EXPORT_SYMBOL_GPL(irq_domain_translate_onecell);
+
 /**
  * irq_domain_translate_twocell() - Generic translate for direct two cell
  * bindings