Re: [PATCH 2/3] dt-bindings: remoteproc: add Versal-NET platform

Krzysztof Kozlowski
2024-03-20T07:41:02Z

On 19/03/2024 15:42, Tanmay Shah wrote:
>
>
> On 3/19/24 12:30 AM, Krzysztof Kozlowski wrote:
>> On 19/03/2024 01:51, Tanmay Shah wrote:
>>> Hello Krzysztof,
>>>
>>> Thanks for reviews. Please find my comments below.
>>>
>>> On 3/17/24 1:53 PM, Krzysztof Kozlowski wrote:
>>>> On 15/03/2024 22:15, Tanmay Shah wrote:
>>>>> AMD-Xilinx Versal-NET platform is successor of Versal platform. It
>>>>> contains multiple clusters of cortex-R52 real-time processing units.
>>>>> Each cluster contains two cores of cortex-R52 processors. Each cluster
>>>>> can be configured in lockstep mode or split mode.
>>>>>
>>>>> Each R52 core is assigned 128KB of TCM memory. ATCM memory is 64KB, BTCM
>>>>> and CTCM memoreis are 32KB each. Each TCM memory has its own dedicated
>>>>> power-domain that needs to be requested before using it.
>>>>>
>>>>> Signed-off-by: Tanmay Shah <tanmay.shah@amd.com>
>>>>> ---
>>>>> .../remoteproc/xlnx,zynqmp-r5fss.yaml | 220 +++++++++++++++---
>>>>> 1 file changed, 184 insertions(+), 36 deletions(-)
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
>>>>> index 711da0272250..55654ee02eef 100644
>>>>> --- a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
>>>>> +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
>>>>> @@ -18,7 +18,9 @@ description: |
>>>>>
>>>>> properties:
>>>>> compatible:
>>>>> - const: xlnx,zynqmp-r5fss
>>>>> + enum:
>>>>> + - xlnx,zynqmp-r5fss
>>>>> + - xlnx,versal-net-r52fss
>>>>>
>>>>> "#address-cells":
>>>>> const: 2
>>>>> @@ -64,7 +66,9 @@ patternProperties:
>>>>>
>>>>> properties:
>>>>> compatible:
>>>>> - const: xlnx,zynqmp-r5f
>>>>> + enum:
>>>>> + - xlnx,zynqmp-r5f
>>>>> + - xlnx,versal-net-r52f
>>>>>
>>>>> reg:
>>>>> minItems: 1
>>>>> @@ -135,9 +139,11 @@ required:
>>>>> allOf:
>>>>> - if:
>>>>> properties:
>>>>> - xlnx,cluster-mode:
>>>>> - enum:
>>>>> - - 1
>>>>> + compatible:
>>>>> + contains:
>>>>> + enum:
>>>>> + - xlnx,versal-net-r52fss
>>>>
>>>> Why do you touch these lines?
>>>>
>>>>> +
>>>>> then:
>>>>> patternProperties:
>>>>> "^r5f@[0-9a-f]+$":
>>>>> @@ -149,16 +155,14 @@ allOf:
>>>>> items:
>>>>> - description: ATCM internal memory
>>>>> - description: BTCM internal memory
>>>>> - - description: extra ATCM memory in lockstep mode
>>>>> - - description: extra BTCM memory in lockstep mode
>>>>> + - description: CTCM internal memory
>>>>>
>>>>> reg-names:
>>>>> minItems: 1
>>>>> items:
>>>>> - - const: atcm0
>>>>> - - const: btcm0
>>>>> - - const: atcm1
>>>>> - - const: btcm1
>>>>> + - const: atcm
>>>>> + - const: btcm
>>>>> + - const: ctcm
>>>>>
>>>>> power-domains:
>>>>> minItems: 2
>>>>> @@ -166,33 +170,70 @@ allOf:
>>>>> - description: RPU core power domain
>>>>> - description: ATCM power domain
>>>>> - description: BTCM power domain
>>>>> - - description: second ATCM power domain
>>>>> - - description: second BTCM power domain
>>>>> + - description: CTCM power domain
>>>>>
>>>>> else:
>>>>> - patternProperties:
>>>>> - "^r5f@[0-9a-f]+$":
>>>>> - type: object
>>>>> -
>>>>> - properties:
>>>>> - reg:
>>>>> - minItems: 1
>>>>> - items:
>>>>> - - description: ATCM internal memory
>>>>> - - description: BTCM internal memory
>>>>> -
>>>>> - reg-names:
>>>>> - minItems: 1
>>>>> - items:
>>>>> - - const: atcm0
>>>>> - - const: btcm0
>>>>> -
>>>>> - power-domains:
>>>>> - minItems: 2
>>>>> - items:
>>>>> - - description: RPU core power domain
>>>>> - - description: ATCM power domain
>>>>> - - description: BTCM power domain
>>>>> + allOf:
>>>>> + - if:
>>>>> + properties:
>>>>> + xlnx,cluster-mode:
>>>>> + enum:
>>>>> + - 1
>>>>
>>>> Whatever you did here, is not really readable. You have now multiple
>>>> if:then:if:then embedded.
>>>
>>> For ZynqMP platform, TCM can be configured differently in lockstep mode
>>> and split mode.
>>>
>>> For Versal-NET no such configuration is available, but new CTCM memory
>>> is added.
>>>
>>> So, I am trying to achieve following representation of TCM for both:
>>>
>>> if: versal-net compatible
>>> then:
>>> ATCM - 64KB
>>> BTCM - 32KB
>>> CTCM - 32KB
>>>
>>> else: (ZynqMP compatible)
>>> if:
>>> xlnx,cluster-mode (lockstep mode)
>>> then:
>>> ATCM0 - 64KB
>>> BTCM0 - 64KB
>>> ATCM1 - 64KB
>>> BTCM1 - 64KB
>>> else: (split mode)
>>> ATCM0 - 64KB
>>> BTCM0 - 64KB
>>>
>>>
>>> If bindings are getting complicated, does it make sense to introduce
>>> new file for Versal-NET bindings? Let me know how you would like me
>>> to proceed.
>>
>> All this is broken in your previous patchset, but now we nicely see.
>>
>> No, this does not work like this. You do not have entirely different
>> programming models in one device, don't you?
>>
>
> I don't understand what do you mean? Programming model is same. Only number
> of TCMs are changing based on configuration and platform. I can certainly
> list different compatible for different platforms as requested. But other than
> that not sure what needs to be fixed.

You cannot have same programming model with different memory mappings.
Anyway, please follow writing bindings rules: all of your different
devices must have dedicated compatible. I really though we talked about
two IPs on same SoC...

Best regards,
Krzysztof