linux-kernel - Re: [PATCH 4/4] ARM64: dts: imx: add i.MX8QXP system controller RTC support

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Date:   Wed, 28 Nov 2018 10:12:30 +0100
From:   Lothar Waßmann <LW@...O-electronics.de>
To:     Anson Huang <anson.huang@....com>
Cc:     "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "alexandre.belloni@...tlin.com" <alexandre.belloni@...tlin.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will.deacon@....com" <will.deacon@....com>,
        Aisheng DONG <aisheng.dong@....com>,
        Andy Gross <andy.gross@...aro.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "horms+renesas@...ge.net.au" <horms+renesas@...ge.net.au>,
        "heiko@...ech.de" <heiko@...ech.de>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "enric.balletbo@...labora.com" <enric.balletbo@...labora.com>,
        "amit.kucheria@...aro.org" <amit.kucheria@...aro.org>,
        "ezequiel@...labora.com" <ezequiel@...labora.com>,
        "olof@...om.net" <olof@...om.net>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "linux-rtc@...r.kernel.org" <linux-rtc@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 4/4] ARM64: dts: imx: add i.MX8QXP system controller RTC
 support

Anson Huang <anson.huang@....com> wrote:

> Hi, Lothar
> 
> Best Regards!
> Anson Huang
> 
> > -----Original Message-----
> > From: Lothar Waßmann [mailto:LW@...O-electronics.de]
> > Sent: 2018年11月28日 17:04
> > To: Anson Huang <anson.huang@....com>
> > Cc: a.zummo@...ertech.it; alexandre.belloni@...tlin.com;
> > robh+dt@...nel.org; mark.rutland@....com; catalin.marinas@....com;
> > will.deacon@....com; Aisheng DONG <aisheng.dong@....com>; Andy Gross
> > <andy.gross@...aro.org>; arnd@...db.de; horms+renesas@...ge.net.au;
> > heiko@...ech.de; bjorn.andersson@...aro.org; enric.balletbo@...labora.com;
> > amit.kucheria@...aro.org; ezequiel@...labora.com; olof@...om.net;
> > shawnguo@...nel.org; linux-rtc@...r.kernel.org; devicetree@...r.kernel.org;
> > linux-kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> > dl-linux-imx <linux-imx@....com>
> > Subject: Re: [PATCH 4/4] ARM64: dts: imx: add i.MX8QXP system controller
> > RTC support
> > 
> > Hi,
> > 
> > On Tue, 27 Nov 2018 09:41:46 +0000 Anson Huang wrote:  
> > > Add i.MX8QXP system controller RTC support.
> > >
> > > Signed-off-by: Anson Huang <Anson.Huang@....com>
> > > ---
> > >  arch/arm64/boot/dts/freescale/imx8qxp.dtsi | 4 ++++
> > >  1 file changed, 4 insertions(+)
> > >
> > > diff --git a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi  
> > b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi  
> > > index 9155d45..ef57db6 100644
> > > --- a/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> > > +++ b/arch/arm64/boot/dts/freescale/imx8qxp.dtsi
> > > @@ -433,4 +433,8 @@
> > >  		#size-cells = <1>;
> > >  		ranges = <0x5f000000 0x0 0x5f000000 0x1000000>;
> > >  	};
> > > +
> > > +	rtc: rtc {
> > > +		compatible = "nxp,imx8qxp-sc-rtc";
> > > +	};
> > >  };  
> > IMO this should be disabled by default.  
> 
> This module is NOT depending on any board design, should it be enabled by default in soc dtsi?
> Like wdog etc..
> 
What about existing users (if there are any), which would have a new
device appearing when updating the DTB?


Lothar Waßmann
-- 
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