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

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Date:   Tue, 24 Jan 2023 12:23:47 +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 v3 05/10] dt-bindings: soc: fsl: cpm_qe: Add QMC
 controller

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 ?

Best regards,
Hervé


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