linux-kernel - Re: [PATCH v2 05/10] dt-bindings: soc: fsl: cpm

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Message-ID: <20230110090650.2138edf0@bootlin.com>
Date:   Tue, 10 Jan 2023 09:06:50 +0100
From:   Herve Codina <herve.codina@...tlin.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Li Yang <leoyang.li@....com>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Qiang Zhao <qiang.zhao@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v2 05/10] dt-bindings: soc: fsl: cpm_qe: Add QMC
 controller

Hi Krzysztof,

On Sun, 8 Jan 2023 16:14:47 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

[...]
> > +
> > +  interrupts:
> > +    description: SCC interrupt line in the CPM interrupt controller  
> 
> Missing constraints.

'maxItems: 1' will be added in v3

> 
> > +
> > +  fsl,cpm-command:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: Cf. soc/fsl/cpm_qe/cpm.txt  
> 
> Missing description.

'fsl,cpm-command' will be removed in v3.
The value needed is determined based on other information.
This is not needed in the DT.

> 
> > +
> > +  tsa:
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +    description: phandle to the TSA  
> 
> Missing vendor prefix. Does not look like a generic property.

Will be be changed to 'fsl,tsa'
and also 'tsa-cell-id' will be changed to 'fsl,tsa-cell-id'

> 
[...]
> > +
> > +patternProperties:
> > +  "^channel@([0-9]|[1-5][0-9]|6[0-3])$":
> > +    description:
> > +      A channel managed by this controller
> > +    type: object
> > +
> > +    properties:
> > +      reg:
> > +        minimum: 0
> > +        maximum: 63
> > +        description:
> > +          The channel number
> > +
> > +      fsl,mode:
> > +        $ref: /schemas/types.yaml#/definitions/string
> > +        enum: [transparent, hdlc]
> > +        default: transparent
> > +        description: Operational mode  
> 
> And what do they mean?

I will change with
  description: |
    The channel operational mode
     - hdlc: The channel handles HDLC frames
     - transparent: The channel handles raw data without any processing

> 
> > +
> > +      fsl,reverse-data:
> > +        $ref: /schemas/types.yaml#/definitions/flag
> > +        description:
> > +          The bit order as seen on the channels is reversed,
> > +          transmitting/receiving the MSB of each octet first.
> > +          This flag is used only in 'transparent' mode.
> > +
> > +      tx-ts-mask:  
> 
> Missing vendor prefix.

Will be added, also on rx-ts-mask.

> 
> > +        $ref: /schemas/types.yaml#/definitions/uint64
> > +        description:
> > +          Channel assigned Tx time-slots within the Tx time-slots routed
> > +          by the TSA to this cell.
> > +
> > +      rx-ts-mask:
> > +        $ref: /schemas/types.yaml#/definitions/uint64
> > +        description:
> > +          Channel assigned Rx time-slots within the Rx time-slots routed
> > +          by the TSA to this cell.
> > +
> > +    required:
> > +      - reg
> > +      - tx-ts-mask
> > +      - rx-ts-mask
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - reg-names
> > +  - interrupts
> > +  - tsa
> > +  - tsa-cell-id
> > +  - '#address-cells'
> > +  - '#size-cells'
> > +  - '#chan-cells'
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/soc/fsl-tsa.h>
> > +
> > +    scc_qmc@a60 {  
> 
> No underscores in node names.
> 
> Node names should be generic.
> https://devicetree-specification.readthedocs.io/en/latest/chapter2-devicetree-basics.html#generic-names-recommendation

Will be changed to qmc@a60

> 
> > +        compatible = "fsl,mpc885-scc-qmc", "fsl,cpm1-scc-qmc";
> > +        reg = <0xa60 0x20>,
> > +              <0x3f00 0xc0>,
> > +              <0x2000 0x1000>;
> > +        reg-names = "scc_regs", "scc_pram", "dpram";
> > +        interrupts = <27>;
> > +        interrupt-parent = <&CPM_PIC>;
> > +        fsl,cpm-command = <0xc0>;
> > +
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +        #chan-cells = <1>;
> > +
> > +        tsa = <&tsa>;
> > +        tsa-cell-id = <FSL_CPM_TSA_SCC4>;
> > +
> > +        channel@16 {
> > +            /* Ch16 : First 4 even TS from all routed from TSA */
> > +            reg = <16>;
> > +            fsl,mode = "transparent";
> > +            fsl,reverse-data;
> > +            tx-ts-mask = <0x00000000 0x000000AA>;
> > +            rx-ts-mask = <0x00000000 0x000000AA>;  
> 
> Keep case consistent. lower-case hex.

Will be fixed

> 
> Best regards,
> Krzysztof
> 

Thanks for the review,

Best regards,
Hervé

-- 
Hervé Codina, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com