Some controllers have irqs that aren't wired up and must never be used.
For the generic chip attached to an irq_domain this provides a mask that
can be used to block out particular irqs so that they never get mapped.
Signed-off-by: Grant Likely <grant.likely@linaro.org>
Link: http://lkml.kernel.org/r/1369793454-19197-2-git-send-email-grant.likely@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* @num_ct: Number of available irq_chip_type instances (usually 1)
* @private: Private data for non generic chip callbacks
* @installed: bitfield to denote installed interrupts
+ * @unused: bitfield to denote unused interrupts
* @domain: irq domain pointer
* @list: List head for keeping track of instances
* @chip_types: Array of interrupt irq_chip_types
unsigned int num_ct;
void *private;
unsigned long installed;
+ unsigned long unused;
struct irq_domain *domain;
struct list_head list;
struct irq_chip_type chip_types[0];
idx = hw_irq % dgc->irqs_per_chip;
+ if (test_bit(idx, &gc->unused))
+ return -ENOTSUPP;
+
if (test_bit(idx, &gc->installed))
return -EBUSY;