extcon: arizona: Allow configuration of MICBIAS rise time

Allow configuration of the rise time for MICBIAS via platform data, the
delay required depends on things like the external component selection.
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>

drivers/extcon/extcon-arizona.c

@@ -417,6 +417,12 @@ static int arizona_extcon_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (arizona->pdata.micd_bias_start_time)
+		regmap_update_bits(arizona->regmap, ARIZONA_MIC_DETECT_1,
+				   ARIZONA_MICD_BIAS_STARTTIME_MASK,
+				   arizona->pdata.micd_bias_start_time
+				   << ARIZONA_MICD_BIAS_STARTTIME_SHIFT);
+
 	arizona_extcon_set_mode(info, 0);
 
 	info->input = devm_input_allocate_device(&pdev->dev);

include/linux/mfd/arizona/pdata.h

@@ -99,6 +99,9 @@ struct arizona_pdata {
 	/** GPIO for mic detection polarity */
 	int micd_pol_gpio;
 
+	/** Mic detect ramp rate */
+	int micd_bias_start_time;
+
 	/** Headset polarity configurations */
 	struct arizona_micd_config *micd_configs;
 	int num_micd_configs;