linux-kernel - Re: [PATCH v8 4/5] rtc: mt6397: Add support for the MediaTek MT6358 RTC

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Date:   Mon, 17 Feb 2020 11:51:42 +0800
From:   Ran Bi <ran.bi@...iatek.com>
To:     Yingjoe Chen <yingjoe.chen@...iatek.com>
CC:     Hsin-Hsiung Wang <hsin-hsiung.wang@...iatek.com>,
        Lee Jones <lee.jones@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Josef Friedl <josef.friedl@...ed.at>,
        <srv_heupstream@...iatek.com>,
        Frank Wunderlich <frank-w@...lic-files.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Sean Wang <sean.wang@...iatek.com>,
        <linux-kernel@...r.kernel.org>,
        Richard Fontana <rfontana@...hat.com>,
        <devicetree@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Eddie Huang <eddie.huang@...iatek.com>,
        <linux-rtc@...r.kernel.org>, Sean Wang <sean.wang@...iatek.com>,
        Josef Friedl <josef.friedl@...ed.at>,
        "Frank Wunderlich" <frank-w@...lic-files.de>
Subject: Re: [PATCH v8 4/5] rtc: mt6397: Add support for the MediaTek MT6358
 RTC

On Tue, 2020-02-04 at 00:50 +0800, Yingjoe Chen wrote:
> > diff --git a/include/linux/mfd/mt6397/rtc.h b/include/linux/mfd/mt6397/rtc.h
> > index f84b916..fffe34a 100644
> > --- a/include/linux/mfd/mt6397/rtc.h
> > +++ b/include/linux/mfd/mt6397/rtc.h
> > @@ -18,7 +18,8 @@
> >  #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_IRQ_STA            0x0002
> >  #define RTC_IRQ_STA_AL         BIT(0)
> > @@ -57,6 +58,10 @@
> >  #define MTK_RTC_POLL_DELAY_US  10
> >  #define MTK_RTC_POLL_TIMEOUT   (jiffies_to_usecs(HZ))
> >  
> > +struct mtk_rtc_data {
> > +	u32			wrtgr;
> > +};
> > +
> >  struct mt6397_rtc {
> >  	struct device           *dev;
> >  	struct rtc_device       *rtc_dev;
> > @@ -66,6 +71,15 @@ 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,
> >  };
> 
> Hi,
> 
> Putting these in header file doesn't looks right to me.
> Who need this? can you move them back to rtc-mt6397.c?
> 
> Joe.C
> 

This could also effect kernel/drivers/power/reset/mt6323-poweroff.c
which using same region of RTC registers.
There are 2 ways of modification:
1. kernel/drivers/rtc/rtc-mt6397.c implement do_pwroff function and
export to mt6323-poweroff.c
2. Just modify mt6323-poweroff.c file to compatible this patch. I mean
using RTC_WRTGR_MT6397 to replace RTC_WRTGR. Or modify mt6323-poweroff.c
like rtc-mt6397.c