mfd: Conditionally add WM831x backlight subdevice

The WM831x backlight driver requires at least the specification of the
current sink to use and a maximum current to allow them to function and
will actively interfere with other users of the regulators it uses if
misconfigured so only register the subdevice for it if this platform
data has been supplied.

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

1 files changed, 6 insertions, 0 deletions

diff --git a/include/linux/mfd/wm831x/pdata.h b/include/linux/mfd/wm831x/pdata.h
index 571e60136264..90d820260aad 100644
--- a/include/linux/mfd/wm831x/pdata.h
+++ b/include/linux/mfd/wm831x/pdata.h
@@ -18,6 +18,11 @@
 struct wm831x;
 struct regulator_init_data;
 
+struct wm831x_backlight_pdata {
+        int isink;     /** ISINK to use, 1 or 2 */
+        int max_uA;    /** Maximum current to allow */
+};
+
 struct wm831x_backup_pdata {
         int charger_enable;
         int no_constant_voltage;  /** Disable constant voltage charging */
@@ -87,6 +92,7 @@ struct wm831x_pdata {
         int (*post_init)(struct wm831x *wm831x);
 
         int gpio_base;
+        struct wm831x_backlight_pdata *backlight;
         struct wm831x_backup_pdata *backup;
         struct wm831x_battery_pdata *battery;
         struct wm831x_touch_pdata *touch;