From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eddie Huang <eddie.huang@mediatek.com>
Subject: Re: [PATCH v2 9/9] rtc: Add support for the MediaTek MT6358 RTC
Date: Mon, 11 Mar 2019 14:10:19 +0800
Message-ID: <1552284619.28295.3.camel@mtksdaap41>
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To: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Cc: Lee Jones <lee.jones@linaro.org>, Rob Herring <robh+dt@kernel.org>, Matthias Brugger <matthias.bgg@gmail.com>, Mark Brown <broonie@kernel.org>, Marc Zyngier <marc.zyngier@arm.com>, srv_heupstream <srv_heupstream@mediatek.com>, "linux-mediatek@lists.infradead.org" <linux-mediatek@lists.infradead.org>, "linux-rtc@vger.kernel.org" <linux-rtc@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, "devicetree@vger.kernel.org" <devicetree@vger.kernel.org>, Liam Girdwood <lgirdwood@gmail.com>, Mark Rutland <mark.rutland@arm.com>, Sean Wang <Sean.Wang@mediatek.com>, Alessandro Zummo <a.zummo@towertech.it>, Alexandre Belloni <alexandre.belloni@bootlin.com>
List-Id: devicetree@vger.kernel.org

On Mon, 2019-03-11 at 11:46 +0800, Hsin-Hsiung Wang wrote:
> From: Ran Bi <ran.bi@mediatek.com>
> 
> This add support for the MediaTek MT6358 RTC. MT6397 mfd will pass
> RTC_WRTGR address offset to RTC driver.
> 
> Signed-off-by: Ran Bi <ran.bi@mediatek.com>
> ---
>  drivers/rtc/rtc-mt6397.c | 16 ++++++++++++++--
>  1 file changed, 14 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-mt6397.c b/drivers/rtc/rtc-mt6397.c
> index f85f1fc..c8a0090 100644
> --- a/drivers/rtc/rtc-mt6397.c
> +++ b/drivers/rtc/rtc-mt6397.c
> @@ -27,7 +27,7 @@
>  #define RTC_BBPU		0x0000
>  #define RTC_BBPU_CBUSY		BIT(6)
>  
> -#define RTC_WRTGR		0x003c
> +#define RTC_WRTGR_DEFAULT	0x003c
>  
>  #define RTC_IRQ_STA		0x0002
>  #define RTC_IRQ_STA_AL		BIT(0)
> @@ -78,6 +78,7 @@ struct mt6397_rtc {
>  	struct regmap		*regmap;
>  	int			irq;
>  	u32			addr_base;
> +	u32			wrtgr_offset;

It is strange that hardware change trigger register offset, I think we
have no choice to add a field to describe it.

>  };
>  
>  static int mtk_rtc_write_trigger(struct mt6397_rtc *rtc)
> @@ -86,7 +87,8 @@ 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->wrtgr_offset, 1);
>  	if (ret < 0)
>  		return ret;
>  
> @@ -341,6 +343,15 @@ static int mtk_rtc_probe(struct platform_device *pdev)
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	rtc->addr_base = res->start;
>  
> +	res = platform_get_resource(pdev, IORESOURCE_REG, 0);
> +	if (res) {
> +		rtc->wrtgr_offset = res->start;
> +		dev_info(&pdev->dev, "register offset:%d\n", rtc->wrtgr_offset);

Nit: useless log

> +	} else {
> +		rtc->wrtgr_offset = RTC_WRTGR_DEFAULT;
> +		dev_err(&pdev->dev, "Failed to get register offset\n");
> +	}
> +
>  	rtc->irq = platform_get_irq(pdev, 0);
>  	if (rtc->irq < 0)
>  		return rtc->irq;
> @@ -420,6 +431,7 @@ 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,mt6358-rtc", },
>  	{ .compatible = "mediatek,mt6397-rtc", },
>  	{ }
>  };

Without the log, you can my get 
Acked-by: Eddie Huang <eddie.huang@mediatekcom>