linux-kernel - Re: [PATCH v4 10/10] rtc: Add support for the MediaTek MT6358 RTC

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Date:   Mon, 5 Aug 2019 09:23:38 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Thomas Gleixner <tglx@...utronix.de>,
        Richard Fontana <rfontana@...hat.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Allison Randal <allison@...utok.net>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-rtc@...r.kernel.org, srv_heupstream@...iatek.com,
        Ran Bi <ran.bi@...iatek.com>
Subject: Re: [PATCH v4 10/10] rtc: Add support for the MediaTek MT6358 RTC

Hi,

The subject should be:

"rtc: mt6397: Add support for the MediaTek MT6358 RTC"

On 05/08/2019 13:21:58+0800, Hsin-Hsiung Wang wrote:
> From: Ran Bi <ran.bi@...iatek.com>
> 
> This add support for the MediaTek MT6358 RTC. Driver using
> compatible data to store different RTC_WRTGR address offset.
> 
> Review-by: Yingjoe Chen <yingjoe.chen@...iatek.com>
> Signed-off-by: Ran Bi <ran.bi@...iatek.com>
> ---
>  drivers/rtc/rtc-mt6397.c | 43 +++++++++++++++++++++++++++++++++++--------
>  1 file changed, 35 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
> index 828def7..e23c215 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_compatible {

I would name that struct mtk_rtc_data

> +	u32			wrtgr_addr;

and this member should be wrtgr_offset or simply wrtgr.

> +};
> +
>  struct mt6397_rtc {
>  	struct device		*dev;
>  	struct rtc_device	*rtc_dev;
> @@ -70,7 +76,25 @@ struct mt6397_rtc {
>  	struct regmap		*regmap;
>  	int			irq;
>  	u32			addr_base;
> +	const struct mtk_rtc_compatible *dev_comp;
> +};
> +
> +static const struct mtk_rtc_compatible mt6358_rtc_compat = {
> +	.wrtgr_addr = RTC_WRTGR_MT6358,
> +};
> +
> +static const struct mtk_rtc_compatible mt6397_rtc_compat = {
> +	.wrtgr_addr = RTC_WRTGR_MT6397,
> +};
> +
> +static const struct of_device_id mt6397_rtc_of_match[] = {
> +	{ .compatible = "mediatek,mt6358-rtc",
> +		.data = (void *)&mt6358_rtc_compat, },
> +	{ .compatible = "mediatek,mt6397-rtc",
> +		.data = (void *)&mt6397_rtc_compat, },
> +	{}
>  };
> +MODULE_DEVICE_TABLE(of, mt6397_rtc_of_match);
>  
>  static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
>  {
> @@ -78,7 +102,8 @@ 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->dev_comp->wrtgr_addr, 1);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -324,6 +349,7 @@ static int mtk_rtc_probe(struct platform_device *pdev)
>  	struct resource *res;
>  	struct mt6397_chip *mt6397_chip = dev_get_drvdata(pdev->dev.parent);
>  	struct mt6397_rtc *rtc;
> +	const struct of_device_id *of_id;
>  	int ret;
>  
>  	rtc = devm_kzalloc(&pdev->dev, sizeof(struct mt6397_rtc), GFP_KERNEL);
> @@ -333,6 +359,13 @@ static int mtk_rtc_probe(struct platform_device *pdev)
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	rtc->addr_base = res->start;
>  
> +	of_id = of_match_device(mt6397_rtc_of_match, &pdev->dev);
> +	if (!of_id) {
> +		dev_err(&pdev->dev, "Failed to probe of_node\n");
> +		return -EINVAL;

This will never happen because probe would not be called if there is no
match. You could also use of_device_get_match_data to avoid having to
move the of_device_id table.

> +	}
> +	rtc->dev_comp = of_id->data;
> +
>  	rtc->irq = platform_get_irq(pdev, 0);
>  	if (rtc->irq < 0)
>  		return rtc->irq;
> @@ -408,12 +441,6 @@ 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