linux-kernel - Re: [PATCH v3 6/7] dt-bindings: soc: qcom: Extend RPMh power controller binding to describe thermal warming device

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Date:   Thu, 17 Oct 2019 11:28:18 -0400
From:   Thara Gopinath <thara.gopinath@...aro.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Eduardo Valentin <edubezval@...il.com>,
        Zhang Rui <rui.zhang@...el.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Andy Gross <agross@...nel.org>, amit.kucheria@...durent.com,
        Mark Rutland <mark.rutland@....com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Linux PM <linux-pm@...r.kernel.org>,
        DTML <devicetree@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 6/7] dt-bindings: soc: qcom: Extend RPMh power
 controller binding to describe thermal warming device

Hello Ulf,
Thanks for the review!

On 10/17/2019 05:04 AM, Ulf Hansson wrote:
> On Wed, 16 Oct 2019 at 21:37, Thara Gopinath <thara.gopinath@...aro.org> wrote:
>>
>> RPMh power controller hosts mx domain that can be used as thermal
>> warming device. Add a sub-node to specify this.
>>
>> Signed-off-by: Thara Gopinath <thara.gopinath@...aro.org>
>> ---
>>  Documentation/devicetree/bindings/power/qcom,rpmpd.txt | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> index eb35b22..fff695d 100644
>> --- a/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> +++ b/Documentation/devicetree/bindings/power/qcom,rpmpd.txt
>> @@ -18,6 +18,16 @@ Required Properties:
>>  Refer to <dt-bindings/power/qcom-rpmpd.h> for the level values for
>>  various OPPs for different platforms as well as Power domain indexes
>>
>> += SUBNODES
>> +RPMh alsp hosts power domains that can behave as thermal warming device.
>> +These are expressed as subnodes of the RPMh. The name of the node is used
>> +to identify the power domain and must therefor be "mx".
>> +
>> +- #cooling-cells:
>> +       Usage: optional
>> +       Value type: <u32>
>> +       Definition: must be 2
>> +
> 
> Just wanted to express a minor thought about this. In general we use
> subnodes of PM domain providers to represent the topology of PM
> domains (subdomains), this is something different, which I guess is
> fine.
> 
> I assume the #cooling-cells is here tells us this is not a PM domain
> provider, but a "cooling device provider"?
Yep.
> 
> Also, I wonder if it would be fine to specify "power-domains" here,
> rather than using "name" as I think that is kind of awkward!?
Do you mean "power-domain-names" ? I am using this to match against the
genpd names defined in the provider driver.

Warm Regards
Thara