linux-kernel - RE: [PATCH 3/3] arm64: dts: imx8mq: Add system counter node

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Date:   Sun, 23 Jun 2019 11:24:44 +0000
From:   Anson Huang <anson.huang@....com>
To:     Martin Kepplinger <martink@...teo.de>,
        "daniel.lezcano@...aro.org" <daniel.lezcano@...aro.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        Abel Vesa <abel.vesa@....com>,
        "ccaione@...libre.com" <ccaione@...libre.com>,
        "angus@...ea.ca" <angus@...ea.ca>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "agx@...xcpu.org" <agx@...xcpu.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 3/3] arm64: dts: imx8mq: Add system counter node

Hi, Martin

> -----Original Message-----
> From: Martin Kepplinger <martink@...teo.de>
> Sent: Saturday, June 22, 2019 10:16 PM
> To: Anson Huang <anson.huang@....com>; daniel.lezcano@...aro.org;
> tglx@...utronix.de; robh+dt@...nel.org; mark.rutland@....com;
> shawnguo@...nel.org; s.hauer@...gutronix.de; kernel@...gutronix.de;
> festevam@...il.com; l.stach@...gutronix.de; Abel Vesa
> <abel.vesa@....com>; ccaione@...libre.com; angus@...ea.ca;
> andrew.smirnov@...il.com; agx@...xcpu.org; linux-
> kernel@...r.kernel.org; devicetree@...r.kernel.org; linux-arm-
> kernel@...ts.infradead.org
> Cc: dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH 3/3] arm64: dts: imx8mq: Add system counter node
> 
> On 21.06.19 10:28, Anson.Huang@....com wrote:
> > From: Anson Huang <Anson.Huang@....com>
> >
> > Add i.MX8MQ system counter node to enable timer-imx-sysctr broadcast
> > timer driver.
> 
> with these changes and TIMER_IMX_SYS_CTR selected, I don't see cpuidle
> working yet (which is what I want to achieve on imx8mq). Might there be a
> system counter clock definition or anything else missing?

i.MX8MQ is different about system counter enablement, with this patch series,
no need to have system counter clock definition, this patch is just to enable the
system counter as broadcast timer, it is necessary for further support of cpu-idle,
to enable cpu-idle, another DT patch is needed to add idle node, but as far as  I
know, Abel is working on the workaround of the i.MX8MQ cpu-idle, I don't know
if it is picked up or NOT, so I believe the cpu-idle will be enabled later for i.MX8MQ
by Abel.

Thanks,
Anson.

> 
> thanks,
>                              martin
>