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Message-id: <5631B487.3050501@samsung.com>
Date:	Thu, 29 Oct 2015 14:54:15 +0900
From:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
To:	Alim Akhtar <alim.akhtar@...sung.com>, lee.jones@...aro.org,
	broonie@...nel.org
Cc:	linux-samsung-soc@...r.kernel.org, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>
Subject: Re: [PATCH v4 4/4] drivers/rtc/rtc-s5m.c: add support for S2MPS15 RTC

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@...e-electrons.com>
> Signed-off-by: Alim Akhtar <alim.akhtar@...sung.com>
> ---
>  drivers/rtc/rtc-s5m.c           |   20 ++++++++++++++++++--
>  include/linux/mfd/samsung/rtc.h |    4 ++++
>  2 files changed, 22 insertions(+), 2 deletions(-)
> 
> 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;
> +


You are setting here bit 1 and bit 4. However vendor code sets only bit
4 (called WUDR there). That's confusing. Why the difference? Or maybe I
am looking at wrong vendor tree (SM-G920F)?

>  	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;

Another difference: you are setting here exactly the same values as
S2MPS13 - bit 1 and bit 4. However vendor code sets only bit 4 (called
WUDR there)?

What exactly is necessary to update alarm and time registers on S2MPS15?

> @@ -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);
> -

This is not related to the patch.

Best regards,
Krzysztof


>  	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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