regmap: Implement support for wake IRQs

Allow chips to provide a bank of registers for controlling the wake state
in a similar fashion to the masks and propagate the wake count to the
parent interrupt controller.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

include/linux/regmap.h

@@ -219,6 +219,7 @@ struct regmap_irq {
  * @status_base: Base status register address.
  * @mask_base:   Base mask register address.
  * @ack_base:    Base ack address.  If zero then the chip is clear on read.
+ * @wake_base:   Base address for wake enables.  If zero unsupported.
  * @irq_reg_stride:  Stride to use for chips where registers are not contiguous.
  *
  * @num_regs:    Number of registers in each control bank.
@@ -232,6 +233,7 @@ struct regmap_irq_chip {
 	unsigned int status_base;
 	unsigned int mask_base;
 	unsigned int ack_base;
+	unsigned int wake_base;
 	unsigned int irq_reg_stride;
 
 	int num_regs;