Re: [PATCH v4 4/4] drivers/rtc/rtc-s5m.c: add support for S2MPS15 RTC

[Alim Akhtar <alim.akhtar@xxxxxxxxxxx>]

On 10/29/2015 10:37 AM, Krzysztof Kozlowski wrote:
> On 29.10.2015 13:58, Alim Akhtar wrote:
> > RTC found in s2mps15 is almost same as one found on s2mps14/13
> > with few differences in RTC_UPDATE register fields, like
> > bit fields are changed for WUDR and AUDR.
> > This patch add required changes to enable s2mps15 rtc timer.
> >
> > Cc: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
> > Signed-off-by: Alim Akhtar <alim.akhtar@xxxxxxxxxxx>
> > ---
> >   drivers/rtc/rtc-s5m.c           |   20 ++++++++++++++++++--
> >   include/linux/mfd/samsung/rtc.h |    4 ++++
> >   2 files changed, 22 insertions(+), 2 deletions(-)
>
>
> Oh, this is totally different than previous patch and changelog does not
> mention these changes.
I am still learning to make thing more correct in first attempt, these 
input will help :-), thanks.

> Was the previous RTC patch tested?
Yes, it was tested, but the coverage was limited to wakealarm.

Now I have tested wakealarm and setting hw clock date/time using hwclock 
utility, setting system time/date to rtc and visa-versa, both works as 
expected.

> Here the AUDR and WUDR seem to be reversed... oh, that is strange. :)
Yah, indeed this was a surprised for me also, but this how it is 
implemented in s2mps15.

> Best regards,
> Krzysztof
>
> > diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c
> > index f2504b4eef34..0d106a99958f 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,
> > @@ -223,6 +224,9 @@ static inline int s5m8767_rtc_set_time_reg(struct s5m_rtc_info *info)
> >   	if (info->device_type == S5M8763X || info->device_type == S5M8767X)
> >   		data |= S5M_RTC_TIME_EN_MASK;
> >
> > +	if (info->device_type == S2MPS15X)
> > +		data |= S2MPS15_RTC_WUDR_MASK;
> > +
> >   	ret = regmap_write(info->regmap, info->regs->rtc_udr_update, data);
> >   	if (ret < 0) {
> >   		dev_err(info->dev, "failed to write update reg(%d)\n", ret);
> > @@ -252,6 +256,9 @@ static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
> >   	case S5M8767X:
> >   		data &= ~S5M_RTC_TIME_EN_MASK;
> >   		break;
> > +	case S2MPS15X:
> > +		data |= S2MPS15_RTC_AUDR_MASK;
> > +		break;
> >   	case S2MPS14X:
> >   		data |= S2MPS_RTC_RUDR_MASK;
> >   		break;
> > @@ -275,7 +282,6 @@ static inline int s5m8767_rtc_set_alarm_reg(struct s5m_rtc_info *info)
> >   	if (info->device_type == S2MPS13X)
> >   		regmap_update_bits(info->regmap, info->regs->rtc_udr_update,
> >   				   S2MPS13_RTC_AUDR_MASK, 0);
> > -
> >   	return ret;
> >   }
> >
> > @@ -317,7 +323,8 @@ 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 +346,7 @@ 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 +374,7 @@ 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 +423,7 @@ 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 +473,7 @@ 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 +519,7 @@ 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 +560,7 @@ 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 +644,7 @@ 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 +693,7 @@ 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 +820,7 @@ 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..0be45fccc52b 100644
> > --- a/include/linux/mfd/samsung/rtc.h
> > +++ b/include/linux/mfd/samsung/rtc.h
> > @@ -107,6 +107,10 @@ 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_AUDR_SHIFT	4
> > +#define S2MPS15_RTC_AUDR_MASK	(1 << S2MPS15_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
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