linux-kernel - Re: [PATCH v3 2/2] ASoC: dt-bindings: fsl

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Date:   Tue, 6 Oct 2020 13:34:42 -0500
From:   Rob Herring <robh@...nel.org>
To:     "Viorel Suman (OSS)" <viorel.suman@....nxp.com>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, Timur Tabi <timur@...nel.org>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        Xiubo Li <Xiubo.Lee@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Shengjiu Wang <shengjiu.wang@...il.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Cosmin-Gabriel Samoila <cosmin.samoila@....com>,
        Viorel Suman <viorel.suman@....com>,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>,
        alsa-devel@...a-project.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        NXP Linux Team <linux-imx@....com>,
        Viorel Suman <viorel.suman@...il.com>
Subject: Re: [PATCH v3 2/2] ASoC: dt-bindings: fsl_xcvr: Add document for XCVR

On Tue, Sep 29, 2020 at 12:19:27PM +0300, Viorel Suman (OSS) wrote:
> From: Viorel Suman <viorel.suman@....com>
> 
> XCVR (Audio Transceiver) is a new IP module found on i.MX8MP.
> 
> Signed-off-by: Viorel Suman <viorel.suman@....com>
> ---
>  .../devicetree/bindings/sound/fsl,xcvr.yaml        | 103 +++++++++++++++++++++
>  1 file changed, 103 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sound/fsl,xcvr.yaml
> 
> diff --git a/Documentation/devicetree/bindings/sound/fsl,xcvr.yaml b/Documentation/devicetree/bindings/sound/fsl,xcvr.yaml
> new file mode 100644
> index 00000000..8abab2d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sound/fsl,xcvr.yaml
> @@ -0,0 +1,103 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/sound/fsl,xcvr.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: NXP Audio Transceiver (XCVR) Controller
> +
> +maintainers:
> +  - Viorel Suman <viorel.suman@....com>
> +
> +properties:
> +  $nodename:
> +    pattern: "^xcvr@.*"
> +
> +  compatible:
> +    const: fsl,imx8mp-xcvr
> +
> +  reg:
> +    items:
> +      - description: 20K RAM for code and data
> +      - description: registers space
> +      - description: RX FIFO address
> +      - description: TX FIFO address
> +
> +  reg-names:
> +    items:
> +      - const: ram
> +      - const: regs
> +      - const: rxfifo
> +      - const: txfifo
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    items:
> +      - description: Peripheral clock
> +      - description: PHY clock
> +      - description: SPBA clock
> +      - description: PLL clock
> +
> +  clock-names:
> +    items:
> +      - const: ipg
> +      - const: phy
> +      - const: spba
> +      - const: pll_ipg
> +
> +  dmas:
> +    maxItems: 2
> +
> +  dma-names:
> +    items:
> +      - const: rx
> +      - const: tx
> +
> +  firmware-name:
> +    $ref: /schemas/types.yaml#/definitions/string
> +    const: imx/xcvr/xcvr-imx8mp.bin
> +    description: |
> +      Should contain the name of the default firmware image
> +      file located on the firmware search path

We generally only have this if the name/path can't be fixed (per 
compatible) in the driver. Given you only have 1 possible value, that 
doesn't seem to be the case here.

> +
> +  resets:
> +    maxItems: 1
> +
> +required:
> +  - compatible
> +  - reg
> +  - reg-names
> +  - interrupts
> +  - clocks
> +  - clock-names
> +  - dmas
> +  - dma-names
> +  - firmware-name
> +  - resets

additionalProperties: false

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +    #include <dt-bindings/clock/imx8mp-clock.h>
> +    #include <dt-bindings/reset/imx8mp-reset.h>
> +
> +    xcvr: xcvr@...c0000 {
> +           compatible = "fsl,imx8mp-xcvr";
> +           reg = <0x30cc0000 0x800>,
> +                 <0x30cc0800 0x400>,
> +                 <0x30cc0c00 0x080>,
> +                 <0x30cc0e00 0x080>;
> +           reg-names = "ram", "regs", "rxfifo", "txfifo";
> +           interrupts = <0x0 128 IRQ_TYPE_LEVEL_HIGH>;
> +           clocks = <&audiomix_clk IMX8MP_CLK_AUDIOMIX_EARC_IPG>,
> +                    <&audiomix_clk IMX8MP_CLK_AUDIOMIX_EARC_PHY>,
> +                    <&audiomix_clk IMX8MP_CLK_AUDIOMIX_SPBA2_ROOT>,
> +                    <&audiomix_clk IMX8MP_CLK_AUDIOMIX_AUDPLL_ROOT>;
> +           clock-names = "ipg", "phy", "spba", "pll_ipg";
> +           dmas = <&sdma2 30 2 0>, <&sdma2 31 2 0>;
> +           dma-names = "rx", "tx";
> +           firmware-name = "imx/xcvr/xcvr-imx8mp.bin";
> +           resets = <&audiomix_reset 0>;
> +    };
> -- 
> 2.7.4
>