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

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Message-ID: <DB3PR0402MB39168AC8DB69B81C51CE63C2F5D10@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Wed, 28 Nov 2018 09:21:56 +0000
From:   Anson Huang <anson.huang@....com>
To:     Alexandre Belloni <alexandre.belloni@...tlin.com>
CC:     Lothar Wa┈mann <LW@...O-electronics.de>,
        "a.zummo@...ertech.it" <a.zummo@...ertech.it>,
        "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



Best Regards!
Anson Huang

> -----Original Message-----
> From: Alexandre Belloni [mailto:alexandre.belloni@...tlin.com]
> Sent: 2018掖11昱28祉 17:20
> To: Anson Huang <anson.huang@....com>
> Cc: Lothar Wa┈mann <LW@...O-electronics.de>; a.zummo@...ertech.it;
> 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
> 
> On 28/11/2018 09:06:27+0000, Anson Huang wrote:
> > > > 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..
> >
> 
> I guess the point is that you may not want it enabled, even if it should always
> be working. enabling it by default would affect the RTC ordering for example.

i.MX SoCs ONLY have 1 RTC. And RTC are always enabled by default for all i.MX
SoCs, so do we have to disable it here and enable it in board dts?

Anson.

> 
> 
> --
> Alexandre Belloni, Bootlin
> Embedded Linux and Kernel engineering
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