mfd: Support configuration of WM831x /IRQ output in CMOS mode

Provide platform data allowing the system to set the /IRQ pin into
CMOS mode rather than the default open drain. The default value of
this platform data reflects the default hardware configuration so
there should be no change to existing users.

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

2 files changed, 11 insertions, 0 deletions

diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index 2691648e607e..90ad3fa91329 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -520,6 +520,14 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
                 return 0;
         }
 
+        if (pdata->irq_cmos)
+                i = 0;
+        else
+                i = WM831X_IRQ_OD;
+
+        wm831x_set_bits(wm831x, WM831X_IRQ_CONFIG,
+                        WM831X_IRQ_OD, i);
+
         /* 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
diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index 173086d42af4..ac3aa73943e7 100644
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -109,6 +109,9 @@ struct wm831x_pdata {
         /** Called after subdevices are set up */
         int (*post_init)(struct wm831x *wm831x);
 
+        /** Put the /IRQ line into CMOS mode */
+        bool irq_cmos;
+
         int irq_base;
         int gpio_base;
         struct wm831x_backlight_pdata *backlight;