linux-kernel - Re: [PATCH v2 3/6] dt-bindings: soc: qcom: Add RSC power domain specifier

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20190827223252.GA26039@bogus>
Date:   Tue, 27 Aug 2019 17:32:52 -0500
From:   Rob Herring <robh@...nel.org>
To:     Maulik Shah <mkshah@...eaurora.org>
Cc:     swboyd@...omium.org, agross@...nel.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, bjorn.andersson@...aro.org,
        evgreen@...omium.org, dianders@...omium.org, rnayak@...eaurora.org,
        ilina@...eaurora.org, lsrao@...eaurora.org, ulf.hansson@...aro.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v2 3/6] dt-bindings: soc: qcom: Add RSC power domain
 specifier

On Fri, Aug 23, 2019 at 01:47:00PM +0530, Maulik Shah wrote:
> In addition to transmitting resource state requests to the remote
> processor, the RSC is responsible for powering off/lowering the
> requirements from CPUs subsystem for the associated hardware like
> buses, clocks, and regulators when all CPUs and cluster is powered down.
> 
> The power domain is configured to a low power state and when all the
> CPUs are powered down, the RSC can lower resource state requirements
> and power down the rails that power the CPUs.
> 
> Add PM domain specifier property for RSC controller.
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Maulik Shah <mkshah@...eaurora.org>
> Reviewed-by: Stephen Boyd <swboyd@...omium.org>
> ---
>  Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt b/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
> index 9b86d1eff219..d0ab6e9b6745 100644
> --- a/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
> +++ b/Documentation/devicetree/bindings/soc/qcom/rpmh-rsc.txt
> @@ -83,6 +83,13 @@ Properties:
>  	Value type: <string>
>  	Definition: Name for the RSC. The name would be used in trace logs.
>  
> +- #power-domain-cells:
> +	Usage: optional
> +	Value type: <u32>
> +	Definition: Number of cells in power domain specifier. Optional for
> +		    controllers that may be in 'solver' state where they can
> +		    be in autonomous mode executing low power modes.

What's the value? It's always 0?

> +
>  Drivers that want to use the RSC to communicate with RPMH must specify their
>  bindings as child nodes of the RSC controllers they wish to communicate with.
>  
> @@ -112,6 +119,7 @@ TCS-OFFSET: 0xD00
>  				  <SLEEP_TCS   3>,
>  				  <WAKE_TCS    3>,
>  				  <CONTROL_TCS 1>;
> +		#power-domain-cells = <0>;
>  	};
>  
>  Example 2:
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation.
>