linux-kernel - Re: [PATCH v2 2/4] rtc: Add support for the MediaTek MT2712 RTC

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Date:   Thu, 22 Aug 2019 19:47:49 +0800
From:   Ran Bi <ran.bi@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nicolas Ferre <nicolas.ferre@...rochip.com>,
        <linux-rtc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <srv_heupstream@...iatek.com>, YT Shen <yt.shen@...iatek.com>,
        Eddie Huang <eddie.huang@...iatek.com>,
        Yingjoe Chen <yingjoe.chen@...iatek.com>,
        "Flora Fu" <flora.fu@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>
Subject: Re: [PATCH v2 2/4] rtc: Add support for the MediaTek MT2712 RTC

On Thu, 2019-08-22 at 11:12 +0200, Matthias Brugger wrote:
> 
> On 01/08/2019 13:01, Ran Bi wrote:
> > This add support for the MediaTek MT2712 RTC. It was SoC based RTC, but
> > had different architecture compared with MT7622 RTC.
> > 
> > Signed-off-by: Ran Bi <ran.bi@...iatek.com>
> > ---
> >  drivers/rtc/Kconfig      |  10 +
> >  drivers/rtc/Makefile     |   1 +
> >  drivers/rtc/rtc-mt2712.c | 444 +++++++++++++++++++++++++++++++++++++++
> 
> Can't we just adjust rtc-mt7622.c (and rename it) to unify the source for both
> devices. What is the difference that we need to write a driver of our own?
> 
> Regards,
> Matthias

We cannot merge rtc-mt7622.c and rtc-mt2712.c together. These two rtc
hardwares have totally different design. Registers naming, registers
offset and operating method are different.