Subject: Re: [PATCH v10 4/5] rtc: mt6397: Add support for the MediaTek MT6358 RTC

From: Lee Jones <[email-masked]>
Date: Thu, 12 Mar 2020 07:44:07 +0000

On Wed, 11 Mar 2020, Hsin-Hsiung Wang wrote:

> From: Ran Bi <[email-masked]>
> 
> This add support for the MediaTek MT6358 RTC. Driver using
> compatible data to store different RTC_WRTGR address offset.
> This replace RTC_WRTGR to RTC_WRTGR_MT6323 in mt6323-poweroff
> driver which only needed by armv7 CPU without ATF.
> 
> Signed-off-by: Ran Bi <[email-masked]>
> Signed-off-by: Hsin-Hsiung Wang <[email-masked]>
> ---
>  drivers/power/reset/mt6323-poweroff.c |  2 +-
>  drivers/rtc/rtc-mt6397.c              | 32 ++++++++++++++++++++++++--------
>  include/linux/mfd/mt6397/rtc.h        |  9 ++++++++-
>  3 files changed, 33 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/power/reset/mt6323-poweroff.c b/drivers/power/reset/mt6323-poweroff.c
> index 1caf43d..0532803 100644
> --- a/drivers/power/reset/mt6323-poweroff.c
> +++ b/drivers/power/reset/mt6323-poweroff.c
> @@ -30,7 +30,7 @@ static void mt6323_do_pwroff(void)
>  	int ret;
>  
>  	regmap_write(pwrc->regmap, pwrc->base + RTC_BBPU, RTC_BBPU_KEY);
> -	regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR, 1);
> +	regmap_write(pwrc->regmap, pwrc->base + RTC_WRTGR_MT6323, 1);
>  
>  	ret = regmap_read_poll_timeout(pwrc->regmap,
>  					pwrc->base + RTC_BBPU, val,
> diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
> index cda238d..7a5a9e2 100644
> --- a/drivers/rtc/rtc-mt6397.c
> +++ b/drivers/rtc/rtc-mt6397.c
> @@ -9,18 +9,38 @@
>  #include <linux/mfd/mt6397/core.h>
>  #include <linux/module.h>
>  #include <linux/mutex.h>
> +#include <linux/of_device.h>
>  #include <linux/platform_device.h>
>  #include <linux/regmap.h>
>  #include <linux/rtc.h>
>  #include <linux/mfd/mt6397/rtc.h>
>  #include <linux/mod_devicetable.h>
>  
> +static const struct mtk_rtc_data mt6358_rtc_data = {
> +	.wrtgr = RTC_WRTGR_MT6358,
> +};
> +
> +static const struct mtk_rtc_data mt6397_rtc_data = {
> +	.wrtgr = RTC_WRTGR_MT6397,
> +};
> +
> +static const struct of_device_id mt6397_rtc_of_match[] = {
> +	{ .compatible = "mediatek,mt6323-rtc",
> +		.data = (void *)&mt6397_rtc_data, },
> +	{ .compatible = "mediatek,mt6358-rtc",
> +		.data = (void *)&mt6358_rtc_data, },
> +	{ .compatible = "mediatek,mt6397-rtc",
> +		.data = (void *)&mt6397_rtc_data, },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
> +
>  static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
>  {
>  	int ret;
>  	u32 data;
>  
> -	ret = regmap_write(rtc->regmap, rtc->addr_base + RTC_WRTGR, 1);
> +	ret = regmap_write(rtc->regmap, rtc->addr_base + rtc->data->wrtgr, 1);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -269,6 +289,9 @@ static int mtk_rtc_probe(struct platform_device *pdev)
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	rtc->addr_base = res->start;
>  
> +	rtc->data = (struct mtk_rtc_data *)
> +			of_device_get_match_data(&pdev->dev);
> +
>  	rtc->irq = platform_get_irq(pdev, 0);
>  	if (rtc->irq < 0)
>  		return rtc->irq;
> @@ -325,13 +348,6 @@ static int mt6397_rtc_resume(struct device *dev)
>  static SIMPLE_DEV_PM_OPS(mt6397_pm_ops, mt6397_rtc_suspend,
>  			mt6397_rtc_resume);
>  
> -static const struct of_device_id mt6397_rtc_of_match[] = {
> -	{ .compatible = "mediatek,mt6323-rtc", },
> -	{ .compatible = "mediatek,mt6397-rtc", },
> -	{ }
> -};
> -MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
> -
>  static struct platform_driver mtk_rtc_driver = {
>  	.driver = {
>  		.name = "mt6397-rtc",
> diff --git a/include/linux/mfd/mt6397/rtc.h b/include/linux/mfd/mt6397/rtc.h
> index 7dfb63b..66534ed 100644
> --- a/include/linux/mfd/mt6397/rtc.h
> +++ b/include/linux/mfd/mt6397/rtc.h
> @@ -18,7 +18,9 @@
>  #define RTC_BBPU_CBUSY         BIT(6)
>  #define RTC_BBPU_KEY            (0x43 << 8)
>  
> -#define RTC_WRTGR              0x003c
> +#define RTC_WRTGR_MT6358       0x3a
> +#define RTC_WRTGR_MT6397       0x3c
> +#define RTC_WRTGR_MT6323       RTC_WRTGR_MT6397
>  
>  #define RTC_IRQ_STA            0x0002
>  #define RTC_IRQ_STA_AL         BIT(0)
> @@ -65,6 +67,10 @@
>  #define MTK_RTC_POLL_DELAY_US  10
>  #define MTK_RTC_POLL_TIMEOUT   (jiffies_to_usecs(HZ))
>  
> +struct mtk_rtc_data {
> +	u32			wrtgr;
> +};

Do you expect to add more properties to this struct?

If not, it seems a bit overkill.

>  struct mt6397_rtc {
>  	struct device           *dev;
>  	struct rtc_device       *rtc_dev;
> @@ -74,6 +80,7 @@ struct mt6397_rtc {
>  	struct regmap           *regmap;
>  	int                     irq;
>  	u32                     addr_base;
> +	const struct mtk_rtc_data *data;

'data' is a terrible variable name.

Why do you need to store this?

It's one variable which is used once AFAICT.

>  };
>  
>  #endif /* _LINUX_MFD_MT6397_RTC_H_ */

-- 
Lee Jones [李琼斯]
Linaro Services Technical Lead
Linaro.org │ Open source software for ARM SoCs
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