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

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Message-ID: <20181128093345.GC8952@piout.net>
Date:   Wed, 28 Nov 2018 10:33:45 +0100
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Anson Huang <anson.huang@....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

On 28/11/2018 09:21:56+0000, Anson Huang wrote:
> > > 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?
> 

I would say that most of the i.MX based boards include another RTC
because the SoC one consumes way too much power.

Note that I don't care too much whether it is enabled by default, I
was simply explaining why you may want to disable it by default.

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com