extcon: arizona: Add support for headphone detection on wm5110 rev D

wm5110 rev D is the first chip to use headphone detection IP 2, specify
such and make a small correction as the impedance value is actually read
in 0.5 ohm increments now.
Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>

drivers/extcon/extcon-arizona.c

@@ -435,6 +435,8 @@ static int arizona_hpdet_read(struct arizona_extcon_info *info)
 		}
 
 		val &= ARIZONA_HP_LVL_B_MASK;
+		/* Convert to ohms, the value is in 0.5 ohm increments */
+		val /= 2;
 
 		regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_1,
 			    &range);
@@ -1147,6 +1149,16 @@ static int arizona_extcon_probe(struct platform_device *pdev)
 			break;
 		}
 		break;
+	case WM5110:
+		switch (arizona->rev) {
+		case 0 ... 2:
+			break;
+		default:
+			info->micd_clamp = true;
+			info->hpdet_ip = 2;
+			break;
+		}
+		break;
 	default:
 		break;
 	}