linux-kernel - Re: [PATCH v2] dt: psci: Update DT bindings to support hierarchical PSCI states

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Message-ID: <20180103194232.nsa2tko6nooybkuj@rob-hp-laptop>
Date:   Wed, 3 Jan 2018 13:42:32 -0600
From:   Rob Herring <robh@...nel.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Mark Rutland <mark.rutland@....com>, devicetree@...r.kernel.org,
        Sudeep Holla <sudeep.holla@....com>,
        Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
        Brendan Jackman <Brendan.Jackman@....com>,
        Lina Iyer <lina.iyer@...aro.org>,
        Kevin Hilman <khilman@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2] dt: psci: Update DT bindings to support hierarchical
 PSCI states

On Thu, Dec 28, 2017 at 03:40:37PM +0100, Ulf Hansson wrote:
> From: Lina Iyer <lina.iyer@...aro.org>
> 
> Update DT bindings to represent hierarchical CPU and CPU domain idle states
> for PSCI. Also update the PSCI examples to clearly show how flattened and
> hierarchical idle states can be represented in DT.
> 
> Signed-off-by: Lina Iyer <lina.iyer@...aro.org>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> ---
> 
> Changes in v2:
> 	- Addressed comments from Rob.
> 	- Updated some labels in the examples to get more consistency.
> 
> For your information, I have picked up the work from Lina Iyer around the so
> called CPU cluster idling series [1,2] and I working on new versions. However,
> I decided to post the updates to the PSCI DT bindings first, as they will be
> needed to be agreed upon before further changes can be done to the PSCI firmware
> driver.
> 
> Note, these bindings have been discussed over and over again, at LKML, but
> especially also at various Linux conferences, like LPC and Linaro Connect. We
> finally came to a conclusion and the changes we agreed upon, should be reflected
> in this update.
> 
> Of course, it's a while ago since the latest discussions, but hopefully people
> don't have too hard time to remember.
> 
> Kind regards
> Uffe
> 
> [1]
> https://www.spinics.net/lists/arm-kernel/msg566200.html
> 
> [2]
> https://lwn.net/Articles/716300/
> 
> ---
>  Documentation/devicetree/bindings/arm/psci.txt | 152 +++++++++++++++++++++++++
>  1 file changed, 152 insertions(+)

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

I'd like to see some R-by by some of the ARM folks too.

Rob