genirq: Add IRQCHIP_SKIP_SET_WAKE flag

Some irq chips need the irq_set_wake() functionality, but do not
require a irq_set_wake() callback. Instead of forcing an empty
callback to be implemented add a flag which notes this fact. Check for
the flag in set_irq_wake_real() and return success when set.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 59517300a315..73e31abeba1c 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h
@@ -336,12 +336,14 @@ struct irq_chip {
  * IRQCHIP_MASK_ON_SUSPEND:     Mask non wake irqs in the suspend path
  * IRQCHIP_ONOFFLINE_ENABLED:   Only call irq_on/off_line callbacks
  *                              when irq enabled
+ * IRQCHIP_SKIP_SET_WAKE:       Skip chip.irq_set_wake(), for this irq chip
  */
 enum {
         IRQCHIP_SET_TYPE_MASKED         = (1 <<  0),
         IRQCHIP_EOI_IF_HANDLED          = (1 <<  1),
         IRQCHIP_MASK_ON_SUSPEND         = (1 <<  2),
         IRQCHIP_ONOFFLINE_ENABLED       = (1 <<  3),
+        IRQCHIP_SKIP_SET_WAKE           = (1 <<  4),
 };
 
 /* This include will go away once we isolated irq_desc usage to core code */