linux-kernel - RE: [PATCH 2/2] arm64: dts: imx8mm: Correct OPP table according to latest datasheet

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Message-ID: <DB3PR0402MB39167143DD42C6A76B2A2A7BF5FC0@DB3PR0402MB3916.eurprd04.prod.outlook.com>
Date:   Fri, 28 Jun 2019 06:17:02 +0000
From:   Anson Huang <anson.huang@....com>
To:     Leonard Crestez <leonard.crestez@....com>,
        Jacky Bai <ping.bai@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>
CC:     "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>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        Daniel Baluta <daniel.baluta@....com>,
        Abel Vesa <abel.vesa@....com>,
        "andrew.smirnov@...il.com" <andrew.smirnov@...il.com>,
        "ccaione@...libre.com" <ccaione@...libre.com>,
        "angus@...ea.ca" <angus@...ea.ca>,
        "agx@...xcpu.org" <agx@...xcpu.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 2/2] arm64: dts: imx8mm: Correct OPP table according to
 latest datasheet

Hi, Leonard

> -----Original Message-----
> From: Leonard Crestez
> Sent: Friday, June 28, 2019 2:01 PM
> To: Anson Huang <anson.huang@....com>; Jacky Bai <ping.bai@....com>;
> l.stach@...gutronix.de
> Cc: robh+dt@...nel.org; mark.rutland@....com; shawnguo@...nel.org;
> s.hauer@...gutronix.de; kernel@...gutronix.de; festevam@...il.com;
> viresh.kumar@...aro.org; Daniel Baluta <daniel.baluta@....com>; Abel
> Vesa <abel.vesa@....com>; andrew.smirnov@...il.com;
> ccaione@...libre.com; angus@...ea.ca; agx@...xcpu.org;
> devicetree@...r.kernel.org; linux-arm-kernel@...ts.infradead.org; linux-
> kernel@...r.kernel.org; dl-linux-imx <linux-imx@....com>
> Subject: Re: [PATCH 2/2] arm64: dts: imx8mm: Correct OPP table according to
> latest datasheet
> 
> On 28.06.2019 06:37, Anson.Huang@....com wrote:
> 
> > According to latest datasheet (Rev.0.2, 04/2019) from below links,
> > 1.8GHz is ONLY available for consumer part, so the market segment bits
> > for 1.8GHz opp should ONLY available for consumer part accordingly.
> >
> >   			opp-hz = /bits/ 64 <1800000000>;
> >   			opp-microvolt = <1000000>;
> >   			/* Consumer only but rely on speed grading */
> > -			opp-supported-hw = <0x8>, <0x7>;
> > +			opp-supported-hw = <0x8>, <0x3>;
> 
> Only consumer parts should be fused for this highest OPP. If you don't want
> to rely on this then maybe also delete the comment above?

As I replied in previous i.MX8MQ patch, if the comments make reader confused,
should we just remove all those comments?

Thanks,
Anson.

> 
> --
> Regards,
> leonard