[PATCH v2 3/6] genirq: introduce irq_chip_set_type_parent() helper

It's expected to use this helper when the current
domain doesn't implement .irq_set_type(),  but expect
the parent to do so.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
---
  include/linux/irq.h |  1 +
  kernel/irq/chip.c   | 20 ++++++++++++++++++++
  2 files changed, 21 insertions(+)

diff --git a/include/linux/irq.h b/include/linux/irq.h
index 92188b0..51744bc 100644
--- a/include/linux/irq.h
+++ b/include/linux/irq.h

@@ -484,6 +484,7 @@ extern int irq_chip_set_affinity_parent(struct irq_data *data,
  extern int irq_chip_set_wake_parent(struct irq_data *data, unsigned int on);
  extern int irq_chip_set_vcpu_affinity_parent(struct irq_data *data,
  					     void *vcpu_info);
+extern int irq_chip_set_type_parent(struct irq_data *data, unsigned int type);
  #endif

  /* Handling of unhandled and spurious interrupts: */

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index bdb1b9d..b48938b 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c

@@ -985,6 +985,26 @@ int irq_chip_set_affinity_parent(struct irq_data *data,
  }

  /**
+ * irq_chip_set_type_parent - Set IRQ type on the parent interrupt
+ * @data:	Pointer to interrupt specific data
+ * @type:	IRQ_TYPE_{LEVEL,EDGE}_* value - see include/linux/irq.h
+ *
+ * Conditional, as the underlying parent chip might not implement it.
+ */
+int irq_chip_set_type_parent(struct irq_data *data, unsigned int type)
+{
+	data = data->parent_data;
+
+	if (irq_data_get_irq_chip(data)->flags & IRQCHIP_SKIP_SET_WAKE)
+		return 0;
+