Re: [PATCH v7 10/24] rtc: max77686: Remove dead code for SMPL and WTSR.

[Krzysztof Kozlowski <k.kozlowski@samsung.com>]

On pią, 2014-07-04 at 22:24 +0200, Javier Martinez Canillas wrote:
> The MAX77686 RTC chip has two features called SMPL (Sudden Momentary
> Power Loss) and WTSR (Watchdog Timeout and Software Resets).
> Support for these features seems to be implemented in the driver but
> compilation is disabled using a C pre-processor conditional.
> 
> This code has been disabled since the driver was original merged in
> commit fca1dd03 ("rtc: max77686: add Maxim 77686 driver").
> 
> So, since this code has never been built, let's just remove it.
> 
> Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
> ---
>  drivers/rtc/rtc-max77686.c | 101 ---------------------------------------------
>  1 file changed, 101 deletions(-)


Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

Best regards,
Krzysztof

> 
> diff --git a/drivers/rtc/rtc-max77686.c b/drivers/rtc/rtc-max77686.c
> index c1c6055..7bb5433 100644
> --- a/drivers/rtc/rtc-max77686.c
> +++ b/drivers/rtc/rtc-max77686.c
> @@ -32,15 +32,6 @@
>  #define RTC_UDR_MASK			(1 << RTC_UDR_SHIFT)
>  #define RTC_RBUDR_SHIFT			4
>  #define RTC_RBUDR_MASK			(1 << RTC_RBUDR_SHIFT)
> -/* WTSR and SMPL Register */
> -#define WTSRT_SHIFT			0
> -#define SMPLT_SHIFT			2
> -#define WTSR_EN_SHIFT			6
> -#define SMPL_EN_SHIFT			7
> -#define WTSRT_MASK			(3 << WTSRT_SHIFT)
> -#define SMPLT_MASK			(3 << SMPLT_SHIFT)
> -#define WTSR_EN_MASK			(1 << WTSR_EN_SHIFT)
> -#define SMPL_EN_MASK			(1 << SMPL_EN_SHIFT)
>  /* RTC Hour register */
>  #define HOUR_PM_SHIFT			6
>  #define HOUR_PM_MASK			(1 << HOUR_PM_SHIFT)
> @@ -49,7 +40,6 @@
>  #define ALARM_ENABLE_MASK		(1 << ALARM_ENABLE_SHIFT)
>  
>  #define MAX77686_RTC_UPDATE_DELAY	16
> -#undef MAX77686_RTC_WTSR_SMPL
>  
>  enum {
>  	RTC_SEC = 0,
> @@ -412,64 +402,6 @@ static const struct rtc_class_ops max77686_rtc_ops = {
>  	.alarm_irq_enable = max77686_rtc_alarm_irq_enable,
>  };
>  
> -#ifdef MAX77686_RTC_WTSR_SMPL
> -static void max77686_rtc_enable_wtsr(struct max77686_rtc_info *info, bool enable)
> -{
> -	int ret;
> -	unsigned int val, mask;
> -
> -	if (enable)
> -		val = (1 << WTSR_EN_SHIFT) | (3 << WTSRT_SHIFT);
> -	else
> -		val = 0;
> -
> -	mask = WTSR_EN_MASK | WTSRT_MASK;
> -
> -	dev_info(info->dev, "%s: %s WTSR\n", __func__,
> -			enable ? "enable" : "disable");
> -
> -	ret = regmap_update_bits(info->max77686->rtc_regmap,
> -				 MAX77686_WTSR_SMPL_CNTL, mask, val);
> -	if (ret < 0) {
> -		dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
> -				__func__, ret);
> -		return;
> -	}
> -
> -	max77686_rtc_update(info, MAX77686_RTC_WRITE);
> -}
> -
> -static void max77686_rtc_enable_smpl(struct max77686_rtc_info *info, bool enable)
> -{
> -	int ret;
> -	unsigned int val, mask;
> -
> -	if (enable)
> -		val = (1 << SMPL_EN_SHIFT) | (0 << SMPLT_SHIFT);
> -	else
> -		val = 0;
> -
> -	mask = SMPL_EN_MASK | SMPLT_MASK;
> -
> -	dev_info(info->dev, "%s: %s SMPL\n", __func__,
> -			enable ? "enable" : "disable");
> -
> -	ret = regmap_update_bits(info->max77686->rtc_regmap,
> -				 MAX77686_WTSR_SMPL_CNTL, mask, val);
> -	if (ret < 0) {
> -		dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
> -				__func__, ret);
> -		return;
> -	}
> -
> -	max77686_rtc_update(info, MAX77686_RTC_WRITE);
> -
> -	val = 0;
> -	regmap_read(info->max77686->rtc_regmap, MAX77686_WTSR_SMPL_CNTL, &val);
> -	dev_info(info->dev, "%s: WTSR_SMPL(0x%02x)\n", __func__, val);
> -}
> -#endif /* MAX77686_RTC_WTSR_SMPL */
> -
>  static int max77686_rtc_init_reg(struct max77686_rtc_info *info)
>  {
>  	u8 data[2];
> @@ -519,11 +451,6 @@ static int max77686_rtc_probe(struct platform_device *pdev)
>  		goto err_rtc;
>  	}
>  
> -#ifdef MAX77686_RTC_WTSR_SMPL
> -	max77686_rtc_enable_wtsr(info, true);
> -	max77686_rtc_enable_smpl(info, true);
> -#endif
> -
>  	device_init_wakeup(&pdev->dev, 1);
>  
>  	info->rtc_dev = devm_rtc_device_register(&pdev->dev, "max77686-rtc",
> @@ -556,33 +483,6 @@ err_rtc:
>  	return ret;
>  }
>  
> -static void max77686_rtc_shutdown(struct platform_device *pdev)
> -{
> -#ifdef MAX77686_RTC_WTSR_SMPL
> -	struct max77686_rtc_info *info = platform_get_drvdata(pdev);
> -	int i;
> -	u8 val = 0;
> -
> -	for (i = 0; i < 3; i++) {
> -		max77686_rtc_enable_wtsr(info, false);
> -		regmap_read(info->max77686->rtc_regmap, MAX77686_WTSR_SMPL_CNTL, &val);
> -		dev_info(info->dev, "%s: WTSR_SMPL reg(0x%02x)\n", __func__,
> -				val);
> -		if (val & WTSR_EN_MASK) {
> -			dev_emerg(info->dev, "%s: fail to disable WTSR\n",
> -					__func__);
> -		} else {
> -			dev_info(info->dev, "%s: success to disable WTSR\n",
> -					__func__);
> -			break;
> -		}
> -	}
> -
> -	/* Disable SMPL when power off */
> -	max77686_rtc_enable_smpl(info, false);
> -#endif /* MAX77686_RTC_WTSR_SMPL */
> -}
> -
>  #ifdef CONFIG_PM_SLEEP
>  static int max77686_rtc_suspend(struct device *dev)
>  {
> @@ -622,7 +522,6 @@ static struct platform_driver max77686_rtc_driver = {
>  		.pm	= &max77686_rtc_pm_ops,
>  	},
>  	.probe		= max77686_rtc_probe,
> -	.shutdown	= max77686_rtc_shutdown,
>  	.id_table	= rtc_id,
>  };
>