mfd: Flag WM831x /IRQ as a wake source

The WM831x can generate wake events, some unconditionally, so flag
the primary IRQ as a wake source in order to help the CPU treat the
/IRQ signal appropriately.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index ee88f6a05cec..f7192d438aab 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -517,6 +517,17 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
                 return 0;
         }
 
+        /* Try to flag /IRQ as a wake source; there are a number of
+         * unconditional wake sources in the PMIC so this isn't
+         * conditional but we don't actually care *too* much if it
+         * fails.
+         */
+        ret = enable_irq_wake(irq);
+        if (ret != 0) {
+                dev_warn(wm831x->dev, "Can't enable IRQ as wake source: %d\n",
+                         ret);
+        }
+
         wm831x->irq = irq;
         wm831x->irq_base = pdata->irq_base;