Re: [PATCH v6 6/6] rtc: Add support for the MediaTek MT6358 RTC

[Alexandre Belloni]

On 06/12/2019 21:33:03+0800, Hsin-Hsiung Wang wrote:
> From: Ran Bi <ran.bi@xxxxxxxxxxxx>
> 
> This add support for the MediaTek MT6358 RTC. Driver using
> compatible data to store different RTC_WRTGR address offset.
> 
> Signed-off-by: Ran Bi <ran.bi@xxxxxxxxxxxx>
> Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@xxxxxxxxxxxx>
Acked-by: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxx>

> ---
>  drivers/rtc/rtc-mt6397.c | 38 ++++++++++++++++++++++++++++++--------
>  1 file changed, 30 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
> index b216bdc..631e275 100644
> --- a/drivers/rtc/rtc-mt6397.c
> +++ b/drivers/rtc/rtc-mt6397.c
> @@ -12,6 +12,7 @@
>  #include <linux/irqdomain.h>
>  #include <linux/platform_device.h>
>  #include <linux/of_address.h>
> +#include <linux/of_device.h>
>  #include <linux/of_irq.h>
>  #include <linux/io.h>
>  #include <linux/mfd/mt6397/core.h>
> @@ -19,7 +20,8 @@
>  #define RTC_BBPU		0x0000
>  #define RTC_BBPU_CBUSY		BIT(6)
>  
> -#define RTC_WRTGR		0x003c
> +#define RTC_WRTGR_MT6358	0x3a
> +#define RTC_WRTGR_MT6397	0x3c
>  
>  #define RTC_IRQ_STA		0x0002
>  #define RTC_IRQ_STA_AL		BIT(0)
> @@ -63,6 +65,10 @@
>  #define RTC_NUM_YEARS		128
>  #define RTC_MIN_YEAR_OFFSET	(RTC_MIN_YEAR - RTC_BASE_YEAR)
>  
> +struct mtk_rtc_data {
> +	u32			wrtgr;
> +};
> +
>  struct mt6397_rtc {
>  	struct device		*dev;
>  	struct rtc_device	*rtc_dev;
> @@ -70,15 +76,34 @@ struct mt6397_rtc {
>  	struct regmap		*regmap;
>  	int			irq;
>  	u32			addr_base;
> +	const struct mtk_rtc_data *data;
> +};
> +
> +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,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)
>  {
>  	unsigned long timeout = jiffies + HZ;
>  	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;
>  
> @@ -333,6 +358,9 @@ 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;
> @@ -406,12 +434,6 @@ 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,mt6397-rtc", },
> -	{ }
> -};
> -MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
> -
>  static struct platform_driver mtk_rtc_driver = {
>  	.driver = {
>  		.name = "mt6397-rtc",
> -- 
> 2.6.4

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com