linux-kernel - Re: [PATCH v5 3/4] dt-bindings: arm: coresight: Unify funnel DT binding

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Message-ID: <63901a4c-2f34-a688-48b3-77b3dd8bb5d9@arm.com>
Date:   Fri, 12 Apr 2019 11:43:20 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     leo.yan@...aro.org, mathieu.poirier@...aro.org, robh+dt@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     shiwanglai@...ilicon.com
Subject: Re: [PATCH v5 3/4] dt-bindings: arm: coresight: Unify funnel DT
 binding

On 04/12/2019 11:27 AM, Leo Yan wrote:
> Following the same fashion with replicator DT binding, this patch is to
> unify the DT binding for funnel to support static and dynamic modes;
> finally we get the funnel DT binding as below:
> 
> Before patch:
> 
>    Static funnel, aka. non-configurable funnel:
>      Not supported;
> 
>    Dynamic funnel, aka. configurable funnel:
>      "arm,coresight-funnel", "arm,primecell";
> 
> After patch:
> 
>    Static funnel:
>      "arm,coresight-static-funnel";
> 
>    Dynamic funnel:
>      "arm,coresight-dynamic-funnel", "arm,primecell";
>      "arm,coresight-funnel", "arm,primecell"; (obsolete)
> 
> At the end of this patch, it gives an example for static funnel DT
> binding, and updates the dynamic funnel example.
> 
> Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> Cc: Suzuki K Poulose <suzuki.poulose@....com>
> Cc: Wanglai Shi <shiwanglai@...ilicon.com>
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>   .../devicetree/bindings/arm/coresight.txt     | 53 +++++++++++++++++--
>   1 file changed, 48 insertions(+), 5 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/arm/coresight.txt b/Documentation/devicetree/bindings/arm/coresight.txt
> index d02d160fa8ac..8a88ddebc1a2 100644
> --- a/Documentation/devicetree/bindings/arm/coresight.txt
> +++ b/Documentation/devicetree/bindings/arm/coresight.txt
> @@ -8,7 +8,8 @@ through the intermediate links connecting the source to the currently selected
>   sink. Each CoreSight component device should use these properties to describe
>   its hardware characteristcs.
>   
> -* Required properties for all components *except* non-configurable replicators:
> +* Required properties for all components *except* non-configurable replicators
> +  and non-configurable funnels:
>   
>   	* compatible: These have to be supplemented with "arm,primecell" as
>   	  drivers are using the AMBA bus interface.  Possible values include:
> @@ -24,8 +25,10 @@ its hardware characteristcs.
>   		  discovered at boot time when the device is probed.
>   			"arm,coresight-tmc", "arm,primecell";
>   
> -		- Trace Funnel:
> -			"arm,coresight-funnel", "arm,primecell";
> +		- Trace Programmable Funnel:
> +			"arm,coresight-dynamic-funnel", "arm,primecell";
> +			"arm,coresight-funnel", "arm,primecell"; (OBSOLETE. For
> +				backward compatibility and will be removed)
>   
>   		- Embedded Trace Macrocell (version 3.x) and
>   					Program Flow Trace Macrocell:
> @@ -65,7 +68,7 @@ its hardware characteristcs.
>   	  "stm-stimulus-base", each corresponding to the areas defined in "reg".
>   
>   * Required properties for devices that don't show up on the AMBA bus, such as
> -  non-configurable replicators:
> +  non-configurable replicators and non-configurable funnels:
>   
>   	* compatible: Currently supported value is (note the absence of the
>   	  AMBA markee):
> @@ -74,6 +77,9 @@ its hardware characteristcs.
>   			"arm,coresight-replicator"; (OBSOLETE. For backward
>   				compatibility and will be removed)
>   
> +		- Coresight Non-configurable Funnel:
> +			"arm,coresight-static-funnel";
> +
>   	* port or ports: see "Graph bindings for Coresight" below.
>   
>   * Optional properties for ETM/PTMs:
> @@ -203,8 +209,45 @@ Example:
>   		};
>   	};
>   
> +	funnel {
> +		/*
> +		 * non-configurable funnel don't show up on the AMBA
> +		 * bus.  As such no need to add "arm,primecell".
> +		 */
> +		compatible = "arm,coresight-static-funnel";
> +		clocks = <&crg_ctrl HI3660_PCLK>;
> +		clock-names = "apb_pclk";
> +
> +		out-ports {
> +			port {
> +				combo_funnel_out: endpoint {
> +					remote-endpoint = <&top_funnel_in>;
> +				};
> +			};
> +		};
> +
> +		in-ports {
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			port@0 {
> +				reg = <0>;
> +				combo_funnel_in0: endpoint {
> +					remote-endpoint = <&cluster0_etf_out>;
> +				};
> +			};
> +
> +			port@1 {
> +				reg = <1>;
> +				combo_funnel_in1: endpoint {
> +					remote-endpoint = <&cluster1_etf_out>;
> +				};
> +			};
> +		};
> +	};
> +
>   	funnel@...40000 {
> -		compatible = "arm,coresight-funnel", "arm,primecell";
> +		compatible = "arm,coresight-dynamic-funnel", "arm,primecell";
>   		reg = <0 0x20040000 0 0x1000>;
>   
>   		clocks = <&oscclk6a>;
> 


Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>