pinctrl: intel: Add ~4k bias support

All versions that have 20k and 5k resistance, i.e. all that
the driver supports, may support ~4k when the above mentioned
are connected in parallel. Add such a support.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

drivers/pinctrl/intel/pinctrl-intel.c

@@ -577,6 +577,9 @@ static int intel_config_get_pull(struct intel_pinctrl *pctrl, unsigned int pin,
 		case PADCFG1_TERM_1K:
 			*arg = 1000;
 			break;
+		case PADCFG1_TERM_4K:
+			*arg = 4000;
+			break;
 		case PADCFG1_TERM_5K:
 			*arg = 5000;
 			break;
@@ -602,6 +605,9 @@ static int intel_config_get_pull(struct intel_pinctrl *pctrl, unsigned int pin,
 				return -EINVAL;
 			*arg = 1000;
 			break;
+		case PADCFG1_TERM_4K:
+			*arg = 4000;
+			break;
 		case PADCFG1_TERM_5K:
 			*arg = 5000;
 			break;
@@ -712,6 +718,9 @@ static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int pin,
 		case 5000:
 			value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
 			break;
+		case 4000:
+			value |= PADCFG1_TERM_4K << PADCFG1_TERM_SHIFT;
+			break;
 		case 1000:
 			value |= PADCFG1_TERM_1K << PADCFG1_TERM_SHIFT;
 			break;
@@ -734,6 +743,9 @@ static int intel_config_set_pull(struct intel_pinctrl *pctrl, unsigned int pin,
 		case 5000:
 			value |= PADCFG1_TERM_5K << PADCFG1_TERM_SHIFT;
 			break;
+		case 4000:
+			value |= PADCFG1_TERM_4K << PADCFG1_TERM_SHIFT;
+			break;
 		case 1000:
 			if (!(community->features & PINCTRL_FEATURE_1K_PD)) {
 				ret = -EINVAL;