ASoC: Support configuration of WM8958 microphone bias analogue parameters

The WM8958 has a different microphone bias architecture to WM8994 so needs
different configuration to WM8994. Support this in platform data.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/include/linux/mfd/wm8994/pdata.h b/include/linux/mfd/wm8994/pdata.h
index 0686946..466b1c7 100644
--- a/include/linux/mfd/wm8994/pdata.h
+++ b/include/linux/mfd/wm8994/pdata.h
@@ -108,13 +108,16 @@
 	 */
 	int micdet_irq;
 
-        /* Microphone biases: 0=0.9*AVDD1 1=0.65*AVVD1 */
+        /* WM8994 microphone biases: 0=0.9*AVDD1 1=0.65*AVVD1 */
         unsigned int micbias1_lvl:1;
         unsigned int micbias2_lvl:1;
 
-        /* Jack detect threashold levels, see datasheet for values */
+        /* WM8994 jack detect threashold levels, see datasheet for values */
         unsigned int jd_scthr:2;
         unsigned int jd_thr:2;
+
+	/* WM8958 microphone bias configuration */
+	int micbias[2];
 };
 
 #endif
diff --git a/include/linux/mfd/wm8994/registers.h b/include/linux/mfd/wm8994/registers.h
index be072fa..f3ee842 100644
--- a/include/linux/mfd/wm8994/registers.h
+++ b/include/linux/mfd/wm8994/registers.h
@@ -63,6 +63,8 @@
 #define WM8994_MICBIAS                          0x3A
 #define WM8994_LDO_1                            0x3B
 #define WM8994_LDO_2                            0x3C
+#define WM8958_MICBIAS1				0x3D
+#define WM8958_MICBIAS2				0x3E
 #define WM8994_CHARGE_PUMP_1                    0x4C
 #define WM8958_CHARGE_PUMP_2                    0x4D
 #define WM8994_CLASS_W_1                        0x51