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From: Mathieu Poirier <mathieu.poirier@linaro.org>
To: Andrew Murray <andrew.murray@arm.com>
Cc: Al.Grant@arm.com, Suzuki K Poulose <suzuki.poulose@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	coresight@lists.linaro.org, Sudeep Holla <sudeep.holla@arm.com>,
	Leo Yan <leo.yan@linaro.org>,
	linux-arm-kernel@lists.infradead.org,
	Mike Leach <mike.leach@linaro.org>
Subject: Re: [PATCH v5 2/3] dt-bindings: arm: coresight: Add support for coresight-loses-context-with-cpu
Date: Tue, 20 Aug 2019 15:59:30 -0600	[thread overview]
Message-ID: <20190820215930.GB12159@xps15> (raw)
In-Reply-To: <20190816154615.39854-3-andrew.murray@arm.com>

On Fri, Aug 16, 2019 at 04:46:14PM +0100, Andrew Murray wrote:
> Some coresight components, because of choices made during hardware
> integration, require their state to be saved and restored across CPU low
> power states.
> 
> The software has no reliable method of detecting when save/restore is
> required thus let's add a binding to inform the kernel.
> 
> Signed-off-by: Andrew Murray <andrew.murray@arm.com>
> ---
>  Documentation/devicetree/bindings/arm/coresight.txt | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> index fcc3bacfd8bc..d02c42d21f2f 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -87,6 +87,15 @@ its hardware characteristcs.
>  
>  	* port or ports: see "Graph bindings for Coresight" below.
>  
> +* Optional properties for all components:
> +
> +	* arm,coresight-loses-context-with-cpu : boolean. Indicates that the
> +	  hardware will lose register context on CPU power down (e.g. CPUIdle).
> +	  An example of where this may be needed are systems which contain a
> +	  coresight component and CPU in the same power domain. When the CPU
> +	  powers down the coresight component also powers down and loses its
> +	  context. This property is currently only used for the ETM 4.x driver.
> +

Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>

When you resend this set make sure to include the device tree mailing list as
instructed by get_maintainer.pl.  Since this set did not CC the DT list, none of
the maintainers over there will look at your patches. 


>  * Optional properties for ETM/PTMs:
>  
>  	* arm,cp14: must be present if the system accesses ETM/PTM management
> -- 
> 2.21.0
> 

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  reply	other threads:[~2019-08-20 21:59 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-16 15:46 [PATCH v5 0/3] coresight: etm4x: save/restore ETMv4 context across CPU low power states Andrew Murray
2019-08-16 15:46 ` [PATCH v5 1/3] coresight: etm4x: save/restore state " Andrew Murray
2019-08-20 21:55   ` Mathieu Poirier
2019-09-13  8:50     ` Andrew Murray
2019-09-12 14:03   ` Suzuki K Poulose
2019-09-13  9:20     ` Andrew Murray
2019-08-16 15:46 ` [PATCH v5 2/3] dt-bindings: arm: coresight: Add support for coresight-loses-context-with-cpu Andrew Murray
2019-08-20 21:59   ` Mathieu Poirier [this message]
2019-09-13  9:22     ` Andrew Murray
2019-09-12 14:06   ` Suzuki K Poulose
2019-08-16 15:46 ` [PATCH v5 3/3] coresight: etm4x: save/restore state for external agents Andrew Murray
2019-08-20 22:01   ` Mathieu Poirier
2019-09-12 15:35   ` Suzuki K Poulose
2019-09-13 10:32     ` Andrew Murray

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