drivers/rtc/rtc-s5m.c: add support for S2MPS13 RTC

The S2MPS13 RTC is almost the same as S2MPS14. The differences when
updating alarm are:
1. Set WUDR+AUDR field instead of WUDR+RUDR.
2. Clear the AUDR field later (it is not auto-cleared).

Signed-off-by: Krzysztof Kozlowski <[e-mail]>
Cc: Alexandre Belloni <[e-mail]>
Cc: Alessandro Zummo <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/rtc/rtc-s5m.c

···
 		val &= S5M_ALARM0_STATUS;
 		break;
 	case S2MPS14X:
+	case S2MPS13X:
 		ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
 				&val);
 		val &= S2MPS_ALARM0_STATUS;
···
 	case S2MPS14X:
 		data |= S2MPS_RTC_RUDR_MASK;
 		break;
+	case S2MPS13X:
+		data |= S2MPS13_RTC_AUDR_MASK;
+		break;
 	default:
 		return -EINVAL;
 	}
···
 	}
 
 	ret = s5m8767_wait_for_udr_update(info);
+
+	/* On S2MPS13 the AUDR is not auto-cleared */
+	if (info->device_type == S2MPS13X)
+		regmap_update_bits(info->regmap, info->regs->rtc_udr_update,
+				   S2MPS13_RTC_AUDR_MASK, 0);
 
 	return ret;
 }
···
 	u8 data[info->regs->regs_count];
 	int ret;
 
-	if (info->device_type == S2MPS14X) {
+	if (info->device_type == S2MPS14X || info->device_type == S2MPS13X) {
 		ret = regmap_update_bits(info->regmap,
 				info->regs->rtc_udr_update,
 				S2MPS_RTC_RUDR_MASK, S2MPS_RTC_RUDR_MASK);
···
 
 	case S5M8767X:
 	case S2MPS14X:
+	case S2MPS13X:
 		s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
 		break;
 
···
 		break;
 	case S5M8767X:
 	case S2MPS14X:
+	case S2MPS13X:
 		ret = s5m8767_tm_to_data(tm, data);
 		break;
 	default:
···
 
 	case S5M8767X:
 	case S2MPS14X:
+	case S2MPS13X:
 		s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
 		alrm->enabled = 0;
 		for (i = 0; i < info->regs->regs_count; i++) {
···
 
 	case S5M8767X:
 	case S2MPS14X:
+	case S2MPS13X:
 		for (i = 0; i < info->regs->regs_count; i++)
 			data[i] &= ~ALARM_ENABLE_MASK;
 
···
 
 	case S5M8767X:
 	case S2MPS14X:
+	case S2MPS13X:
 		data[RTC_SEC] |= ALARM_ENABLE_MASK;
 		data[RTC_MIN] |= ALARM_ENABLE_MASK;
 		data[RTC_HOUR] |= ALARM_ENABLE_MASK;
···
 
 	case S5M8767X:
 	case S2MPS14X:
+	case S2MPS13X:
 		s5m8767_tm_to_data(&alrm->time, data);
 		break;
 
···
 		break;
 
 	case S2MPS14X:
+	case S2MPS13X:
 		data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
 		ret = regmap_write(info->regmap, info->regs->ctrl, data[0]);
 		break;
···
 
 	switch (pdata->device_type) {
 	case S2MPS14X:
+	case S2MPS13X:
 		regmap_cfg = &s2mps14_rtc_regmap_config;
 		info->regs = &s2mps_rtc_regs;
 		alarm_irq = S2MPS14_IRQ_RTCA0;
···
 
 static const struct platform_device_id s5m_rtc_id[] = {
 	{ "s5m-rtc",		S5M8767X },
+	{ "s2mps13-rtc",	S2MPS13X },
 	{ "s2mps14-rtc",	S2MPS14X },
 	{ },
 };

include/linux/mfd/samsung/rtc.h

···
 #define S5M_RTC_UDR_MASK	(1 << S5M_RTC_UDR_SHIFT)
 #define S2MPS_RTC_WUDR_SHIFT	4
 #define S2MPS_RTC_WUDR_MASK	(1 << S2MPS_RTC_WUDR_SHIFT)
+#define S2MPS13_RTC_AUDR_SHIFT	1
+#define S2MPS13_RTC_AUDR_MASK	(1 << S2MPS13_RTC_AUDR_SHIFT)
 #define S2MPS_RTC_RUDR_SHIFT	0
 #define S2MPS_RTC_RUDR_MASK	(1 << S2MPS_RTC_RUDR_SHIFT)
 #define RTC_TCON_SHIFT		1