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

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Date:   Tue, 24 Jan 2023 10:42:32 +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

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)

> 
> > +
> > +  '#address-cells':
> > +    const: 1
> > +
> > +  '#size-cells':
> > +    const: 0
> > +
> > +  '#chan-cells':
> > +    const: 1
> > +
> > +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  
> 
> You still need to explain what do transparent and hdlc mean.

Oups, my bad (already mentioned in the previous version review).

Also, I will rename the property to 'fsl,operational-mode' to be
more precise than just 'fsl,mode'

> 
> > +  
> 
> 
> Best regards,
> Krzysztof
> 

Thanks for the review,
Hervé

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