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From:   Shengjiu Wang <shengjiu.wang@gmail.com>
Date:   Sun, 22 Mar 2020 16:02:57 +0800
Message-ID: <CAA+D8AMC0fuTxDiWEjOVx11eDuGb9WeMhFTzxFx-3fYKvf=-jw@mail.gmail.com>
Subject: Re: [PATCH v5 6/7] ASoC: dt-bindings: fsl_easrc: Add document for EASRC
To:     Rob Herring <robh@kernel.org>
Cc:     Shengjiu Wang <shengjiu.wang@nxp.com>,
        Mark Rutland <mark.rutland@arm.com>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@vger.kernel.org>,
        Linux-ALSA <alsa-devel@alsa-project.org>,
        Timur Tabi <timur@kernel.org>, Xiubo Li <Xiubo.Lee@gmail.com>,
        linuxppc-dev@lists.ozlabs.org, Takashi Iwai <tiwai@suse.com>,
        Liam Girdwood <lgirdwood@gmail.com>,
        Nicolin Chen <nicoleotsuka@gmail.com>,
        Mark Brown <broonie@kernel.org>,
        Fabio Estevam <festevam@gmail.com>,
        linux-kernel <linux-kernel@vger.kernel.org>
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On Sat, Mar 21, 2020 at 1:50 AM Rob Herring <robh@kernel.org> wrote:
>
> On Mon, Mar 09, 2020 at 11:58:33AM +0800, Shengjiu Wang wrote:
> > EASRC (Enhanced Asynchronous Sample Rate Converter) is a new
> > IP module found on i.MX8MN.
> >
> > Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
> > ---
> >  .../devicetree/bindings/sound/fsl,easrc.yaml  | 101 ++++++++++++++++++
> >  1 file changed, 101 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/sound/fsl,easrc.yaml
> >
> > diff --git a/Documentation/devicetree/bindings/sound/fsl,easrc.yaml b/Documentation/devicetree/bindings/sound/fsl,easrc.yaml
> > new file mode 100644
> > index 000000000000..ff22f8056a63
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/sound/fsl,easrc.yaml
> > @@ -0,0 +1,101 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/sound/fsl,easrc.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: NXP Asynchronous Sample Rate Converter (ASRC) Controller
> > +
> > +maintainers:
> > +  - Shengjiu Wang <shengjiu.wang@nxp.com>
> > +
> > +properties:
> > +  $nodename:
> > +    pattern: "^easrc@.*"
> > +
> > +  compatible:
> > +    const: fsl,imx8mn-easrc
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: Peripheral clock
> > +
> > +  clock-names:
> > +    items:
> > +      - const: mem
> > +
> > +  dmas:
> > +    maxItems: 8
> > +
> > +  dma-names:
> > +    items:
> > +      - const: ctx0_rx
> > +      - const: ctx0_tx
> > +      - const: ctx1_rx
> > +      - const: ctx1_tx
> > +      - const: ctx2_rx
> > +      - const: ctx2_tx
> > +      - const: ctx3_rx
> > +      - const: ctx3_tx
> > +
> > +  fsl,easrc-ram-script-name:
>
> 'firmware-name' is the established property name for this.

will use "firmware-name"

>
> > +    allOf:
> > +      - $ref: /schemas/types.yaml#/definitions/string
> > +      - const: imx/easrc/easrc-imx8mn.bin
>
> Though if there's only 1 possible value, why does this need to be in DT?
>
> > +    description: The coefficient table for the filters
>
> If the firmware is only 1 thing, then perhaps this should just be a DT
> property rather than a separate file. It depends on who owns/creates
> this file. If fixed for the platform, then DT is a good fit. If updated
> separately from DT and boot firmware, then keeping it separate makes
> sense.
>
The firmware is not fixed for the platform, it is updated separately from
DT.  So we can keep it separately.

best regards
wang shengjiu