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Date: Thu, 26 Feb 2015 10:47:15 +0000
From: Lee Jones <lee.jones@...aro.org>
To: Krzysztof Kozlowski <k.kozlowski@...sung.com>
Cc: Sangbeom Kim <sbkim73@...sung.com>,
Samuel Ortiz <sameo@...ux.intel.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] rtc: s5m: Remove unused watchdog and sudden
momentary power loss
On Thu, 26 Feb 2015, Krzysztof Kozlowski wrote:
> The WTSR (Watchdog Timer Software Reset) and SMPL (Sudden Momentary
> Power Loss) are never enabled. These are left-overs from board files.
> After removing them the driver's shutdown callback is empty so get rid
> of it as well.
>
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> ---
> Changes since v1:
> 1. None. Patch applied by Andrew Morton. Resending for Lee Jones.
> ---
> drivers/rtc/rtc-s5m.c | 60 ---------------------------------------------------
> 1 file changed, 60 deletions(-)
Due to dependencies with other patches I'll take this through MFD.
Applied, thanks.
> diff --git a/drivers/rtc/rtc-s5m.c b/drivers/rtc/rtc-s5m.c
> index 89ac1d5083c6..4008b84246ca 100644
> --- a/drivers/rtc/rtc-s5m.c
> +++ b/drivers/rtc/rtc-s5m.c
> @@ -48,8 +48,6 @@ struct s5m_rtc_reg_config {
> unsigned int alarm0;
> /* First register for alarm 1, seconds */
> unsigned int alarm1;
> - /* SMPL/WTSR register */
> - unsigned int smpl_wtsr;
> /*
> * Register for update flag (UDR). Typically setting UDR field to 1
> * will enable update of time or alarm register. Then it will be
> @@ -67,7 +65,6 @@ static const struct s5m_rtc_reg_config s5m_rtc_regs = {
> .ctrl = S5M_ALARM1_CONF,
> .alarm0 = S5M_ALARM0_SEC,
> .alarm1 = S5M_ALARM1_SEC,
> - .smpl_wtsr = S5M_WTSR_SMPL_CNTL,
> .rtc_udr_update = S5M_RTC_UDR_CON,
> .rtc_udr_mask = S5M_RTC_UDR_MASK,
> };
> @@ -82,7 +79,6 @@ static const struct s5m_rtc_reg_config s2mps_rtc_regs = {
> .ctrl = S2MPS_RTC_CTRL,
> .alarm0 = S2MPS_ALARM0_SEC,
> .alarm1 = S2MPS_ALARM1_SEC,
> - .smpl_wtsr = S2MPS_WTSR_SMPL_CNTL,
> .rtc_udr_update = S2MPS_RTC_UDR_CON,
> .rtc_udr_mask = S2MPS_RTC_WUDR_MASK,
> };
> @@ -96,7 +92,6 @@ struct s5m_rtc_info {
> int irq;
> int device_type;
> int rtc_24hr_mode;
> - bool wtsr_smpl;
> const struct s5m_rtc_reg_config *regs;
> };
>
> @@ -597,28 +592,6 @@ static const struct rtc_class_ops s5m_rtc_ops = {
> .alarm_irq_enable = s5m_rtc_alarm_irq_enable,
> };
>
> -static void s5m_rtc_enable_wtsr(struct s5m_rtc_info *info, bool enable)
> -{
> - int ret;
> - ret = regmap_update_bits(info->regmap, info->regs->smpl_wtsr,
> - WTSR_ENABLE_MASK,
> - enable ? WTSR_ENABLE_MASK : 0);
> - if (ret < 0)
> - dev_err(info->dev, "%s: fail to update WTSR reg(%d)\n",
> - __func__, ret);
> -}
> -
> -static void s5m_rtc_enable_smpl(struct s5m_rtc_info *info, bool enable)
> -{
> - int ret;
> - ret = regmap_update_bits(info->regmap, info->regs->smpl_wtsr,
> - SMPL_ENABLE_MASK,
> - enable ? SMPL_ENABLE_MASK : 0);
> - if (ret < 0)
> - dev_err(info->dev, "%s: fail to update SMPL reg(%d)\n",
> - __func__, ret);
> -}
> -
> static int s5m8767_rtc_init_reg(struct s5m_rtc_info *info)
> {
> u8 data[2];
> @@ -715,7 +688,6 @@ static int s5m_rtc_probe(struct platform_device *pdev)
> info->dev = &pdev->dev;
> info->s5m87xx = s5m87xx;
> info->device_type = s5m87xx->device_type;
> - info->wtsr_smpl = s5m87xx->wtsr_smpl;
>
> if (s5m87xx->irq_data) {
> info->irq = regmap_irq_get_virq(s5m87xx->irq_data, alarm_irq);
> @@ -731,11 +703,6 @@ static int s5m_rtc_probe(struct platform_device *pdev)
>
> ret = s5m8767_rtc_init_reg(info);
>
> - if (info->wtsr_smpl) {
> - s5m_rtc_enable_wtsr(info, true);
> - s5m_rtc_enable_smpl(info, true);
> - }
> -
> device_init_wakeup(&pdev->dev, 1);
>
> info->rtc_dev = devm_rtc_device_register(&pdev->dev, "s5m-rtc",
> @@ -768,36 +735,10 @@ err:
> return ret;
> }
>
> -static void s5m_rtc_shutdown(struct platform_device *pdev)
> -{
> - struct s5m_rtc_info *info = platform_get_drvdata(pdev);
> - int i;
> - unsigned int val = 0;
> - if (info->wtsr_smpl) {
> - for (i = 0; i < 3; i++) {
> - s5m_rtc_enable_wtsr(info, false);
> - regmap_read(info->regmap, info->regs->smpl_wtsr, &val);
> - pr_debug("%s: WTSR_SMPL reg(0x%02x)\n", __func__, val);
> - if (val & WTSR_ENABLE_MASK)
> - pr_emerg("%s: fail to disable WTSR\n",
> - __func__);
> - else {
> - pr_info("%s: success to disable WTSR\n",
> - __func__);
> - break;
> - }
> - }
> - }
> - /* Disable SMPL when power off */
> - s5m_rtc_enable_smpl(info, false);
> -}
> -
> static int s5m_rtc_remove(struct platform_device *pdev)
> {
> struct s5m_rtc_info *info = platform_get_drvdata(pdev);
>
> - /* Perform also all shutdown steps when removing */
> - s5m_rtc_shutdown(pdev);
> i2c_unregister_device(info->i2c);
>
> return 0;
> @@ -842,7 +783,6 @@ static struct platform_driver s5m_rtc_driver = {
> },
> .probe = s5m_rtc_probe,
> .remove = s5m_rtc_remove,
> - .shutdown = s5m_rtc_shutdown,
> .id_table = s5m_rtc_id,
> };
>
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
Follow Linaro: Facebook | Twitter | Blog
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