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Date:   Tue, 27 Aug 2019 17:32:52 -0500
From:   Rob Herring <robh@kernel.org>
To:     Maulik Shah <mkshah@codeaurora.org>
Cc:     swboyd@chromium.org, agross@kernel.org, david.brown@linaro.org,
        linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-pm@vger.kernel.org, bjorn.andersson@linaro.org,
        evgreen@chromium.org, dianders@chromium.org, rnayak@codeaurora.org,
        ilina@codeaurora.org, lsrao@codeaurora.org, ulf.hansson@linaro.org,
        devicetree@vger.kernel.org
Subject: Re: [PATCH v2 3/6] dt-bindings: soc: qcom: Add RSC power domain
 specifier
Message-ID: <20190827223252.GA26039@bogus>
References: <20190823081703.17325-1-mkshah@codeaurora.org>
 <20190823081703.17325-4-mkshah@codeaurora.org>
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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@vger.kernel.org
> Signed-off-by: Maulik Shah <mkshah@codeaurora.org>
> Reviewed-by: Stephen Boyd <swboyd@chromium.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.
>