linux-kernel - Re: Recommended notation for OPP to avoid DTC warnings

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Date:   Mon, 27 Feb 2017 10:44:45 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Viresh Kumar <viresh.kumar@...aro.org>,
        Rob Herring <robh+dt@...nel.org>, linux-pm@...r.kernel.org,
        devicetree@...r.kernel.org, masahiroy@...nel.org,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Recommended notation for OPP to avoid DTC warnings

On Sun, Feb 26, 2017 at 02:18:03PM +0900, Masahiro Yamada wrote:
> Hi.
> 
> 
> Decumentation/devicetree/bindings/opp/opp.txt
> takes examples like this:
> 
>         opp@...0000000 {
>                 opp-hz = /bits/ 64 <1000000000>;
>                 opp-microvolt = <970000 975000 985000>;
>                 opp-microamp = <70000>;
>                 clock-latency-ns = <300000>;
>                 opp-suspend;
>         };

> If we follow this notation and the device-tree is built with W=1,
> DTC warns like follows:
> 
> Warning (unit_address_vs_reg): Node /opp_table0/opp@...0000000 has a
> unit name, but no reg property
> 
> Is there a recommended notation to avoid it?
> 
> Maybe, simply omit the "@" ?

I think just s/@/-/ should be fine, e.g. call the above opp-1000000000.

Thanks,
Mark.