linux-kernel - Re: [PATCH 02/16] PM / OPP: Add 'opp-microvolt-triplets' binding

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Date:	Mon, 14 Sep 2015 15:30:29 -0500
From:	Rob Herring <robh@...nel.org>
To:	Viresh Kumar <viresh.kumar@...aro.org>,
	Rafael Wysocki <rjw@...ysocki.net>, nm@...com,
	sboyd@...eaurora.org
Cc:	linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
	lee.jones@...aro.org, devicetree@...r.kernel.org,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	open list <linux-kernel@...r.kernel.org>,
	Mark Rutland <mark.rutland@....com>,
	Pawel Moll <pawel.moll@....com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: Re: [PATCH 02/16] PM / OPP: Add 'opp-microvolt-triplets' binding

On 09/11/2015 07:01 AM, Viresh Kumar wrote:
> If 'opp-microvolt' is used to specify values for multiple regulators,
> then we need this additional information to know if the values passed
> should be treated as <target> or <target min max>.

Can't you determine this implicitly from # of cells / # of regulators
being either 1 or 3?

> 
> This is because, DT doesn't differentiate between these two styles:
> 
> prop = <x>, <y>, <z>;
> prop = <x y z>;
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  Documentation/devicetree/bindings/opp/opp.txt | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/opp/opp.txt b/Documentation/devicetree/bindings/opp/opp.txt
> index 8759bc4783ed..719603b87353 100644
> --- a/Documentation/devicetree/bindings/opp/opp.txt
> +++ b/Documentation/devicetree/bindings/opp/opp.txt
> @@ -76,6 +76,16 @@ This describes the OPPs belonging to a device. This node can have following
>    present here is important, as that should match the order in which values are
>    present in 'opp-microvolt' and 'opp-microamp' properties.
>  
> +- opp-microvolt-triplets: This is a required property, only if multiple supplies
> +  are available for the device. Otherwise it is ignored.
> +
> +  'opp-microvolt' can be present in two forms: <target> or <target min max>, per
> +  power-supply. 'opp-microvolt-triplets' property is used to find the form in
> +  which 'opp-microvolt' is present.
> +
> +  If present, then 'opp-microvolt' must be present in <target min max> form,
> +  else in <target> form.

This implies that bindings currently with triplets are wrong since they
will be missing opp-microvolt-triplets.

Rob
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