linux-kernel - Re: [PATCH 1/8] PM / OPP: Reword binding supporting multiple regulators per device

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Date:   Sat, 8 Oct 2016 20:29:17 -0500
From:   Rob Herring <robh@...nel.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>
Cc:     Rafael Wysocki <rjw@...ysocki.net>, nm@...com,
        sboyd@...eaurora.org, Viresh Kumar <vireshk@...nel.org>,
        linaro-kernel@...ts.linaro.org, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Vincent Guittot <vincent.guittot@...aro.org>, d-gerlach@...com,
        broonie@...nel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH 1/8] PM / OPP: Reword binding supporting multiple
 regulators per device

On Tue, Oct 04, 2016 at 05:26:43PM +0530, Viresh Kumar wrote:
> On certain platforms (like TI), DVFS for a single device (CPU) requires
> configuring multiple power supplies.
> 
> The OPP bindings already contains binding and example to explain this
> case, but it isn't sufficient. For example, there is no way for the code
> parsing these bindings to know which voltage values belong to which
> power supply. Also its not possible to know the order in which the
> supplies need to be configured while switching OPPs.
> 
> This patch tries to clarify on those details and does some minor changes
> as well.
> 
> Note that the bindings do not specify the order in which the regulators
> need to be programmed and the order in which the entries are added for
> the supplies.
> 
> The user of the bindings (like the kernel) shall know these details
> already and the DT is responsible to supply only the readings for the
> regulators.
> 
> Cc: Mark Brown <broonie@...nel.org>
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
> ---
>  Documentation/devicetree/bindings/opp/opp.txt | 25 +++++++++++++++++--------
>  1 file changed, 17 insertions(+), 8 deletions(-)

Acked-by: Rob Herring <robh@...nel.org>