Date:   Mon, 30 Jan 2023 12:30:37 -0600
From:   Rob Herring <robh@kernel.org>
To:     Herve Codina <herve.codina@bootlin.com>
Cc:     Li Yang <leoyang.li@nxp.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Nicholas Piggin <npiggin@gmail.com>,
        Qiang Zhao <qiang.zhao@nxp.com>,
        Jaroslav Kysela <perex@perex.cz>,
        Takashi Iwai <tiwai@suse.com>,
        Shengjiu Wang <shengjiu.wang@gmail.com>,
        Xiubo Li <Xiubo.Lee@gmail.com>,
        Fabio Estevam <festevam@gmail.com>,
        Nicolin Chen <nicoleotsuka@gmail.com>,
        linuxppc-dev@lists.ozlabs.org,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: Re: [PATCH v4 05/10] dt-bindings: soc: fsl: cpm_qe: Add QMC
 controller
Message-ID: <20230130183037.GA3076426-robh@kernel.org>
References: <20230126083222.374243-1-herve.codina@bootlin.com>
 <20230126083222.374243-6-herve.codina@bootlin.com>
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On Thu, Jan 26, 2023 at 09:32:17AM +0100, 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@bootlin.com>
> ---
>  .../bindings/soc/fsl/cpm_qe/fsl,qmc.yaml      | 167 ++++++++++++++++++

fsl,cpm1-scc-qmc.yaml

>  1 file changed, 167 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..9141a8ca183b
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/fsl/cpm_qe/fsl,qmc.yaml
> @@ -0,0 +1,167 @@
> +# 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@bootlin.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-serial:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    items:
> +      - items:
> +          - description: phandle to TSA node
> +          - enum: [1, 2, 3]
> +            description: |
> +              TSA serial interface (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
> +      serial interface to use.
> +
> +  '#address-cells':
> +    const: 1
> +
> +  '#size-cells':
> +    const: 0
> +
> +  '#chan-cells':
> +    const: 1

What's this?

> +
> +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,operational-mode:
> +        $ref: /schemas/types.yaml#/definitions/string
> +        enum: [transparent, hdlc]
> +        default: transparent
> +        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.
> +
> +      fsl,tx-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.
> +
> +      fsl,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
> +      - fsl,tx-ts-mask
> +      - fsl,rx-ts-mask
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - fsl,tsa-serial
> +  - '#address-cells'
> +  - '#size-cells'
> +  - '#chan-cells'
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/soc/fsl,tsa.h>
> +
> +    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>;
> +
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +        #chan-cells = <1>;
> +
> +        fsl,tsa-serial = <&tsa FSL_CPM_TSA_SCC4>;
> +
> +        channel@16 {
> +            /* Ch16 : First 4 even TS from all routed from TSA */
> +            reg = <16>;
> +            fsl,mode = "transparent";
> +            fsl,reverse-data;
> +            fsl,tx-ts-mask = <0x00000000 0x000000aa>;
> +            fsl,rx-ts-mask = <0x00000000 0x000000aa>;
> +        };
> +
> +        channel@17 {
> +            /* Ch17 : First 4 odd TS from all routed from TSA */
> +            reg = <17>;
> +            fsl,mode = "transparent";
> +            fsl,reverse-data;
> +            fsl,tx-ts-mask = <0x00000000 0x00000055>;
> +            fsl,rx-ts-mask = <0x00000000 0x00000055>;
> +        };
> +
> +        channel@19 {
> +            /* Ch19 : 8 TS (TS 8..15) from all routed from TSA */
> +            reg = <19>;
> +            fsl,mode = "hdlc";
> +            fsl,tx-ts-mask = <0x00000000 0x0000ff00>;
> +            fsl,rx-ts-mask = <0x00000000 0x0000ff00>;
> +        };
> +    };
> -- 
> 2.39.0
>