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Message-ID: <5025fb10-3bcc-43b1-ae85-b556f1c0415f@linaro.org> Date: Thu, 21 Mar 2024 08:39:38 +0100 From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> To: Tanmay Shah <tanmay.shah@....com>, andersson@...nel.org, mathieu.poirier@...aro.org, robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org, michal.simek@....com, ben.levinsky@....com Cc: linux-remoteproc@...r.kernel.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 2/3] dt-bindings: remoteproc: add Versal-NET platform On 20/03/2024 16:14, Tanmay Shah wrote: > > > On 3/20/24 2:40 AM, Krzysztof Kozlowski wrote: >> 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@....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... > > I agree that Versal compatible should be added, I will do that in next revision. > > For ZynqMP case, it is two IPs on same SOC. In lockstep mode and split mode, > same SOC is configuring TCM differently. > > How this should be resolved for Versal-NET ? Driver avoids such TCM configuration > for Versal-NET. Binding should describe the hardware, not what driver is doing currently, so the question is: does your device have such properties or not? Anyway, you need compatible per each variant and each SoC implementation. Best regards, Krzysztof
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