diff mbox series

[v2,1/9] dt-bindings: arm: Add support for DSB element

Message ID 1674114105-16651-2-git-send-email-quic_taozha@quicinc.com
State New
Headers show
Series [v2,1/9] dt-bindings: arm: Add support for DSB element | expand

Commit Message

Tao Zhang Jan. 19, 2023, 7:41 a.m. UTC
Add property "qcom,dsb-elem-size" to support DSB(Discrete Single
Bit) element for TPDA. Specifies the DSB element size supported
by each monitor connected to the aggregator on each port. Should
be specified in pairs (port, dsb element size).

Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
Signed-off-by: Tao Zhang <taozha@qti.qualcomm.com>
---
 .../bindings/arm/qcom,coresight-tpda.yaml          | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

Comments

Tao Zhang Feb. 27, 2023, 3:07 a.m. UTC | #1
Hi Suzuki,

在 2/22/2023 2:11 AM, Suzuki K Poulose 写道:
> On 19/01/2023 07:41, Tao Zhang wrote:
>> Add property "qcom,dsb-elem-size" to support DSB(Discrete Single
>> Bit) element for TPDA. Specifies the DSB element size supported
>> by each monitor connected to the aggregator on each port. Should
>> be specified in pairs (port, dsb element size).
>>
>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>> Signed-off-by: Tao Zhang <taozha@qti.qualcomm.com>
>> ---
>>   .../bindings/arm/qcom,coresight-tpda.yaml          | 22 
>> ++++++++++++++++++++++
>>   1 file changed, 22 insertions(+)
>>
>> diff --git 
>> a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml 
>> b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>> index 2ec9b5b..298db7f 100644
>> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>> @@ -58,6 +58,26 @@ properties:
>>       minItems: 1
>>       maxItems: 2
>>   +  qcom,dsb-element-size:
>> +    description: |
>> +      Specifies the DSB(Discrete Single Bit) element size supported by
>> +      each monitor connected to the aggregator on each port. Should be
>> +      specified in pairs <port, dsb element size>.
>
> Isn't this a property of the TPDM connected to the port ? i.e. the DSB 
> size ? Thus shouldn't this be part of the TPDM device (and the TPDA 
> will be able to find it from the TPDM device) ?
>
Since  the port number is about the input port of TPDA, this property 
needs to be configured in the TPDA-related settings.

In our current design, TPDM doesn't have a register to record the DSB 
size, and TPDA cannot actively know the TPDM DSB size from the TPDM device.

>
> Suzuki

Best,

Tao
Suzuki K Poulose Feb. 27, 2023, 10:44 a.m. UTC | #2
On 27/02/2023 03:07, Tao Zhang wrote:
> Hi Suzuki,
> 
> 在 2/22/2023 2:11 AM, Suzuki K Poulose 写道:
>> On 19/01/2023 07:41, Tao Zhang wrote:
>>> Add property "qcom,dsb-elem-size" to support DSB(Discrete Single
>>> Bit) element for TPDA. Specifies the DSB element size supported
>>> by each monitor connected to the aggregator on each port. Should
>>> be specified in pairs (port, dsb element size).
>>>
>>> Signed-off-by: Tao Zhang <quic_taozha@quicinc.com>
>>> Signed-off-by: Tao Zhang <taozha@qti.qualcomm.com>
>>> ---
>>>   .../bindings/arm/qcom,coresight-tpda.yaml          | 22 
>>> ++++++++++++++++++++++
>>>   1 file changed, 22 insertions(+)
>>>
>>> diff --git 
>>> a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml 
>>> b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>>> index 2ec9b5b..298db7f 100644
>>> --- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>>> +++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
>>> @@ -58,6 +58,26 @@ properties:
>>>       minItems: 1
>>>       maxItems: 2
>>>   +  qcom,dsb-element-size:
>>> +    description: |
>>> +      Specifies the DSB(Discrete Single Bit) element size supported by
>>> +      each monitor connected to the aggregator on each port. Should be
>>> +      specified in pairs <port, dsb element size>.
>>
>> Isn't this a property of the TPDM connected to the port ? i.e. the DSB 
>> size ? Thus shouldn't this be part of the TPDM device (and the TPDA 
>> will be able to find it from the TPDM device) ?
>>
> Since  the port number is about the input port of TPDA, this property 
> needs to be configured in the TPDA-related settings.

That is because, you chose to describe the property of TPDM in TPDA ?
Instead if you do it as follows :

  tpdm {
        qcom,tpdm-dsb-elemenet-size = <32>
        out_ports {

	port {
              remote-endpoint=<&tpda_port_number>;
	}
  }

  tpda {
        in_ports {
            port {
                  remote-endpoint=<&tpdm0_port0>;
            }
        }
  }


The TPDA driver can figure out the "port" that a given TPDM is connected
to and thus find out the DSB size. For the tpda driver, pdata->conns
could hold the reference to the TPDM device and thus fetch the DSB size.
(Note: James is working on a patch to add input port connections to the
platform data).

Suzuki
diff mbox series

Patch

diff --git a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
index 2ec9b5b..298db7f 100644
--- a/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
+++ b/Documentation/devicetree/bindings/arm/qcom,coresight-tpda.yaml
@@ -58,6 +58,26 @@  properties:
     minItems: 1
     maxItems: 2
 
+  qcom,dsb-element-size:
+    description: |
+      Specifies the DSB(Discrete Single Bit) element size supported by
+      each monitor connected to the aggregator on each port. Should be
+      specified in pairs <port, dsb element size>.
+
+      Note: The maximum value of the port number depends on how many
+      input ports the current TPDA has. DSB element size currently only
+      supports 32-bit and 64-bit.
+    $ref: /schemas/types.yaml#/definitions/uint32-matrix
+    items:
+      items:
+        - description: |
+            "port" indicates TPDA input port number
+          minimum: 0
+        - description: |
+            "dsb element size" indicates dsb element size
+          minimum: 0
+          maximum: 64
+
   clocks:
     maxItems: 1
 
@@ -100,6 +120,8 @@  examples:
        compatible = "qcom,coresight-tpda", "arm,primecell";
        reg = <0x6004000 0x1000>;
 
+       qcom,dsb-element-size = <0 32>;
+
        clocks = <&aoss_qmp>;
        clock-names = "apb_pclk";