mfd: 8821: Add support for pm8821 core driver

Add support for the Qualcomm PM8821 PMIC chip. The core driver
will communicate with the PMIC chip via the MSM SSBI bus.

Initial support is provided for: IRQ, MPP, and Debug

Signed-off-by: Jay Chokshi <jchokshi@codeaurora.org>
diff --git a/include/linux/mfd/pm8xxx/mpp.h b/include/linux/mfd/pm8xxx/mpp.h
index 1bec5a2..a97c3f7 100644
--- a/include/linux/mfd/pm8xxx/mpp.h
+++ b/include/linux/mfd/pm8xxx/mpp.h
@@ -167,6 +167,10 @@
 #define	PM8921_MPP_DIG_LEVEL_L17	4
 #define	PM8921_MPP_DIG_LEVEL_VPH	7
 
+/* Digital Input/Output: level [PM8821] */
+#define	PM8821_MPP_DIG_LEVEL_1P8	1
+#define	PM8821_MPP_DIG_LEVEL_VPH	7
+
 /* Digital Input: control */
 #define	PM8XXX_MPP_DIN_TO_INT		0
 #define	PM8XXX_MPP_DIN_TO_DBUS1		1