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

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Best Regards!
Anson Huang

> -----Original Message-----
> From: Alexandre Belloni [mailto:alexandre.belloni@xxxxxxxxxxx]
> Sent: 2018年11月28日 17:20
> To: Anson Huang <anson.huang@xxxxxxx>
> Cc: Lothar Waßmann <LW@xxxxxxxxxxxxxxxxxxx>; a.zummo@xxxxxxxxxxxx;
> robh+dt@xxxxxxxxxx; mark.rutland@xxxxxxx; catalin.marinas@xxxxxxx;
> will.deacon@xxxxxxx; Aisheng DONG <aisheng.dong@xxxxxxx>; Andy Gross
> <andy.gross@xxxxxxxxxx>; arnd@xxxxxxxx; horms+renesas@xxxxxxxxxxxx;
> heiko@xxxxxxxxx; bjorn.andersson@xxxxxxxxxx; enric.balletbo@xxxxxxxxxxxxx;
> amit.kucheria@xxxxxxxxxx; ezequiel@xxxxxxxxxxxxx; olof@xxxxxxxxx;
> shawnguo@xxxxxxxxxx; linux-rtc@xxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> dl-linux-imx <linux-imx@xxxxxxx>
> 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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