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 <[e-mail]>
Signed-off-by: Chanwoo Choi <[e-mail]>

drivers/extcon/extcon-arizona.c

···
 		}
 
 		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);
···
 		default:
 			info->micd_clamp = true;
 			info->hpdet_ip = 1;
+			break;
+		}
+		break;
+	case WM5110:
+		switch (arizona->rev) {
+		case 0 ... 2:
+			break;
+		default:
+			info->micd_clamp = true;
+			info->hpdet_ip = 2;
 			break;
 		}
 		break;