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SubjectRe: [PATCH v2 3/6] dt-bindings: soc: qcom: Add RSC power domain specifier
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On 8/28/2019 4:02 AM, Rob Herring wrote:
> 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?

yes. its value is always 0. i will update definition to mention this in
next version.

>> +
>> 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.
>>
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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