linux-kernel - Re: [PATCH v11 2/4] dt-bindings: remoteproc: add Tightly Coupled Memory (TCM) bindings

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Message-ID: <294dc34c-11ac-4220-9619-1578ebca6382@amd.com>
Date: Thu, 29 Feb 2024 17:45:26 -0600
From: Tanmay Shah <tanmay.shah@....com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
 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,
 Radhey Shyam Pandey <radhey.shyam.pandey@....com>
Subject: Re: [PATCH v11 2/4] dt-bindings: remoteproc: add Tightly Coupled
 Memory (TCM) bindings

Thanks for reviews.

Ack to all comments, I will address in next revision.


Tanmay

On 2/29/24 3:59 AM, Krzysztof Kozlowski wrote:
> On 19/02/2024 18:44, Tanmay Shah wrote:
> > From: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> > 
> > Introduce bindings for TCM memory address space on AMD-xilinx Zynq
> > UltraScale+ platform. It will help in defining TCM in device-tree
> > and make it's access platform agnostic and data-driven.
> > 
> > Tightly-coupled memories(TCMs) are low-latency memory that provides
> > predictable instruction execution and predictable data load/store
> > timing. Each Cortex-R5F processor contains two 64-bit wide 64 KB memory
> > banks on the ATCM and BTCM ports, for a total of 128 KB of memory.
> > 
> > The TCM resources(reg, reg-names and power-domain) are documented for
> > each TCM in the R5 node. The reg and reg-names are made as required
> > properties as we don't want to hardcode TCM addresses for future
> > platforms and for zu+ legacy implementation will ensure that the
> > old dts w/o reg/reg-names works and stable ABI is maintained.
> > 
> > It also extends the examples for TCM split and lockstep modes.
> > 
> > Signed-off-by: Radhey Shyam Pandey <radhey.shyam.pandey@....com>
> > Signed-off-by: Tanmay Shah <tanmay.shah@....com>
> > ---
> > 
> > Changes in v11:
> >   - Fix yamllint warning and reduce indentation as needed
> > 
> >  .../remoteproc/xlnx,zynqmp-r5fss.yaml         | 192 ++++++++++++++++--
> >  1 file changed, 170 insertions(+), 22 deletions(-)
> > 
> > diff --git a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> > index 78aac69f1060..77030edf41fa 100644
> > --- a/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> > +++ b/Documentation/devicetree/bindings/remoteproc/xlnx,zynqmp-r5fss.yaml
> > @@ -20,9 +20,21 @@ properties:
> >    compatible:
> >      const: xlnx,zynqmp-r5fss
> >  
> > +  "#address-cells":
> > +    const: 2
> > +
> > +  "#size-cells":
> > +    const: 2
> > +
> > +  ranges:
> > +    description: |
> > +      Standard ranges definition providing address translations for
> > +      local R5F TCM address spaces to bus addresses.
> > +
> >    xlnx,cluster-mode:
> >      $ref: /schemas/types.yaml#/definitions/uint32
> >      enum: [0, 1, 2]
> > +    default: 1
> >      description: |
> >        The RPU MPCore can operate in split mode (Dual-processor performance), Safety
> >        lock-step mode(Both RPU cores execute the same code in lock-step,
> > @@ -37,7 +49,7 @@ properties:
> >        2: single cpu mode
> >  
> >  patternProperties:
> > -  "^r5f-[a-f0-9]+$":
> > +  "^r5f@[0-9a-f]+$":
> >      type: object
> >      description: |
> >        The RPU is located in the Low Power Domain of the Processor Subsystem.
> > @@ -54,9 +66,6 @@ patternProperties:
> >        compatible:
> >          const: xlnx,zynqmp-r5f
> >  
> > -      power-domains:
> > -        maxItems: 1
>
> Why power-domains are being dropped? This should have widest constraints
> if you later customize it.
>
> > -
> >        mboxes:
> >          minItems: 1
> >          items:
> > @@ -101,35 +110,174 @@ patternProperties:
> >  
> >      required:
> >        - compatible
> > -      - power-domains
>
> Don't drop power domains.
>
>
> >  
> > -    unevaluatedProperties: false
> > +allOf:
>
> allOf block goes after required:
>
> > +  - if:
> > +      properties:
> > +        xlnx,cluster-mode:
> > +          enum:
> > +            - 1
> > +    then:
> > +      patternProperties:
> > +        "^r5f@[0-9a-f]+$":
> > +          type: object
> > +
> > +          properties:
> > +            reg:
>
> reg is missing in your patternProperties earlier.
>
>
>
> Best regards,
> Krzysztof
>