linux-kernel - Re: [PATCH v3 05/10] dt-bindings: soc: fsl: cpm

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Message-ID: <81f80190-a05c-5d0d-11b2-a80573b86e1c@linaro.org>
Date:   Tue, 24 Jan 2023 13:24:48 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Herve Codina <herve.codina@...tlin.com>
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 v3 05/10] dt-bindings: soc: fsl: cpm_qe: Add QMC
 controller

On 24/01/2023 12:23, Herve Codina wrote:
> On Tue, 24 Jan 2023 11:02:52 +0100
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> 
>> On 24/01/2023 10:42, Herve Codina wrote:
>>> Hi Krzysztof,
>>>
>>> On Tue, 17 Jan 2023 12:31:09 +0100
>>> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
>>>   
>>>> On 13/01/2023 11:37, Herve Codina wrote:  
>>>>> Add support for the QMC (QUICC Multichannel Controller)
>>>>> available in some PowerQUICC SoC such as MPC885 or MPC866.
>>>>>
>>>>> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
>>>>> ---
>>>>>  .../bindings/soc/fsl/cpm_qe/fsl,qmc.yaml      | 164 ++++++++++++++++++
>>>>>  1 file changed, 164 insertions(+)
>>>>>  create mode 100644 Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qmc.yaml
>>>>>
>>>>> diff --git a/Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qmc.yaml b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qmc.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..3ec52f1635c8
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qmc.yaml
>>>>> @@ -0,0 +1,164 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>>>>> +%YAML 1.2
>>>>> +---
>>>>> +$id: http://devicetree.org/schemas/soc/fsl/cpm_qe/fsl,qmc.yaml#
>>>>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>>>>> +
>>>>> +title: PowerQUICC CPM QUICC Multichannel Controller (QMC)
>>>>> +
>>>>> +maintainers:
>>>>> +  - Herve Codina <herve.codina@...tlin.com>
>>>>> +
>>>>> +description: |
>>>>> +  The QMC (QUICC Multichannel Controller) emulates up to 64 channels within
>>>>> +  one serial controller using the same TDM physical interface routed from
>>>>> +  TSA.
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    items:
>>>>> +      - enum:
>>>>> +          - fsl,mpc885-scc-qmc
>>>>> +          - fsl,mpc866-scc-qmc
>>>>> +      - const: fsl,cpm1-scc-qmc
>>>>> +
>>>>> +  reg:
>>>>> +    items:
>>>>> +      - description: SCC (Serial communication controller) register base
>>>>> +      - description: SCC parameter ram base
>>>>> +      - description: Dual port ram base
>>>>> +
>>>>> +  reg-names:
>>>>> +    items:
>>>>> +      - const: scc_regs
>>>>> +      - const: scc_pram
>>>>> +      - const: dpram
>>>>> +
>>>>> +  interrupts:
>>>>> +    maxItems: 1
>>>>> +    description: SCC interrupt line in the CPM interrupt controller
>>>>> +
>>>>> +  fsl,tsa:
>>>>> +    $ref: /schemas/types.yaml#/definitions/phandle
>>>>> +    description: phandle to the TSA
>>>>> +
>>>>> +  fsl,tsa-cell-id:
>>>>> +    $ref: /schemas/types.yaml#/definitions/uint32
>>>>> +    enum: [1, 2, 3]
>>>>> +    description: |
>>>>> +      TSA cell ID (dt-bindings/soc/fsl,tsa.h defines these values)
>>>>> +       - 1: SCC2
>>>>> +       - 2: SCC3
>>>>> +       - 3: SCC4    
>>>>
>>>> Is this used as argument to tsa? If so, this should be part of fsl,tsa
>>>> property, just like we do for all syscon-like phandles.  
>>>
>>> Yes, indeed.
>>> I will move 'fsl,tsa' to 'fsl,tsa-cell' with 'fsl,tsa-cell' a phandle/number
>>> pair (the phandle to TSA node and the TSA cell id to use)  
>>
>> Move to fsl,tsa, not from.
> 
> Well, I plan to remove both fsl,tsa and fsl,tsa-cell-id and use this:
>   fsl,tsa-cell:
>     $ref: /schemas/types.yaml#/definitions/phandle-array
>     items:
>       - items:
>           - description: phandle to TSA node
>           - enum: [1, 2, 3]
>             description: |
>               TSA cell ID (dt-bindings/soc/fsl,tsa.h defines these values)
>                - 1: SCC2
>                - 2: SCC3
>                - 3: SCC4
>     description:
>       Should be a phandle/number pair. The phandle to TSA node and the TSA
>       cell ID to use.
> 
> Is that what you were thinking about ?

Yes, except again, so third time, why calling this "cell"? Move it to
fsl,tsa.

Best regards,
Krzysztof