rtc: s5m.c: Add support for S2MPS15 RTC

RTC found in s2mps15 is almost same as one found on s2mps13
with few differences in RTC_UPDATE register fields, like:
1> Bit[4] and Bit[1] are reversed
   - On s2mps13
          WUDR -> bit[4], AUDR -> bit[1]
   - On s2mps15
	  WUDR -> bit[1], AUDR -> bit[4]
2> In case of s2mps13, for alarm register, need to set both
   WDUR and ADUR high, whereas for s2mps15 only set AUDR to high.
3> On s2mps15, WUDR, RUDR and AUDR functions should never be used
   at the same time.

This patch add required changes to enable s2mps15 rtc timer.

Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

2 files changed, 35 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c
index f2504b4eef34..0d68a85dd429 100644
--- a/drivers/rtc/rtc-s5m.c
+++ b/drivers/rtc/rtc-s5m.c
@@ -188,6 +188,7 @@ static inline int s5m_check_peding_alarm_interrupt(struct s5m_rtc_info *info,
                 ret = regmap_read(info->regmap, S5M_RTC_STATUS, &val);
                 val &= S5M_ALARM0_STATUS;
                 break;
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 ret = regmap_read(info->s5m87xx->regmap_pmic, S2MPS14_REG_ST2,
@@ -219,9 +220,22 @@ static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
                 return ret;
         }
 
-        data |= info->regs->rtc_udr_mask;
-        if (info->device_type == S5M8763X || info->device_type == S5M8767X)
-                data |= S5M_RTC_TIME_EN_MASK;
+        switch (info->device_type) {
+        case S5M8763X:
+        case S5M8767X:
+                data |= info->regs->rtc_udr_mask | S5M_RTC_TIME_EN_MASK;
+        case S2MPS15X:
+                /* As per UM, for write time register, set WUDR bit to high */
+                data |= S2MPS15_RTC_WUDR_MASK;
+                break;
+        case S2MPS14X:
+        case S2MPS13X:
+                data |= info->regs->rtc_udr_mask;
+                break;
+        default:
+                return -EINVAL;
+        }
+
 
         ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
         if (ret < 0) {
@@ -252,6 +266,11 @@ static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
         case S5M8767X:
                 data &= ~S5M_RTC_TIME_EN_MASK;
                 break;
+        case S2MPS15X:
+                /* As per UM, for write alarm, set A_UDR(bit[4]) to high
+                 * rtc_udr_mask above sets bit[4]
+                 */
+                break;
         case S2MPS14X:
                 data |= S2MPS_RTC_RUDR_MASK;
                 break;
@@ -317,7 +336,8 @@ static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
         u8 data[info->regs->regs_count];
         int ret;
 
-        if (info->device_type == S2MPS14X || info->device_type == S2MPS13X) {
+        if (info->device_type == S2MPS15X || 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);
@@ -339,6 +359,7 @@ static int s5m_rtc_read_time(struct device *dev, struct rtc_time *tm)
                 break;
 
         case S5M8767X:
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 s5m8767_data_to_tm(data, tm, info->rtc_24hr_mode);
@@ -366,6 +387,7 @@ static int s5m_rtc_set_time(struct device *dev, struct rtc_time *tm)
                 s5m8763_tm_to_data(tm, data);
                 break;
         case S5M8767X:
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 ret = s5m8767_tm_to_data(tm, data);
@@ -414,6 +436,7 @@ static int s5m_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
                 break;
 
         case S5M8767X:
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 s5m8767_data_to_tm(data, &alrm->time, info->rtc_24hr_mode);
@@ -463,6 +486,7 @@ static int s5m_rtc_stop_alarm(struct s5m_rtc_info *info)
                 break;
 
         case S5M8767X:
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 for (i = 0; i < info->regs->regs_count; i++)
@@ -508,6 +532,7 @@ static int s5m_rtc_start_alarm(struct s5m_rtc_info *info)
                 break;
 
         case S5M8767X:
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 data[RTC_SEC] |= ALARM_ENABLE_MASK;
@@ -548,6 +573,7 @@ static int s5m_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
                 break;
 
         case S5M8767X:
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 s5m8767_tm_to_data(&alrm->time, data);
@@ -631,6 +657,7 @@ static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
                 ret = regmap_raw_write(info->regmap, S5M_ALARM0_CONF, data, 2);
                 break;
 
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 data[0] = (0 << BCD_EN_SHIFT) | (1 << MODEL24_SHIFT);
@@ -679,6 +706,7 @@ static int s5m_rtc_probe(struct platform_device *pdev)
                 return -ENOMEM;
 
         switch (platform_get_device_id(pdev)->driver_data) {
+        case S2MPS15X:
         case S2MPS14X:
         case S2MPS13X:
                 regmap_cfg = &s2mps14_rtc_regmap_config;
@@ -805,6 +833,7 @@ static const struct platform_device_id s5m_rtc_id[] = {
         { "s5m-rtc",            S5M8767X },
         { "s2mps13-rtc",        S2MPS13X },
         { "s2mps14-rtc",        S2MPS14X },
+        { "s2mps15-rtc",        S2MPS15X },
         { },
 };
 MODULE_DEVICE_TABLE(platform, s5m_rtc_id);
diff --git a/include/linux/mfd/samsung/rtc.h b/include/linux/mfd/samsung/rtc.h
index 29c30ac36020..a65e4655d470 100644
--- a/include/linux/mfd/samsung/rtc.h
+++ b/include/linux/mfd/samsung/rtc.h
@@ -107,6 +107,8 @@ enum s2mps_rtc_reg {
 #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 S2MPS15_RTC_WUDR_SHIFT  1
+#define S2MPS15_RTC_WUDR_MASK   (1 << S2MPS15_RTC_WUDR_SHIFT)
 #define S2MPS_RTC_RUDR_SHIFT    0
 #define S2MPS_RTC_RUDR_MASK     (1 << S2MPS_RTC_RUDR_SHIFT)
 #define RTC_TCON_SHIFT          1