linux-kernel - Re: [PATCH] ASoC: dt-bindings: Add dt bindings definition file for imx28 saif

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Message-ID: <20240828100111.10852309@wsk>
Date: Wed, 28 Aug 2024 10:01:11 +0200
From: Lukasz Majewski <lukma@...x.de>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, Fabio
 Estevam <festevam@...il.com>, Conor Dooley <conor+dt@...nel.org>,
 devicetree@...r.kernel.org, linux-sound@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ASoC: dt-bindings: Add dt bindings definition file for
 imx28 saif

Hi Krzysztof,

> On Tue, Aug 27, 2024 at 08:05:28PM +0200, Lukasz Majewski wrote:
> > This file allows correct check of DTS node for imx287 based
> > "fsl,imx28-saif" compatible device.
> > 
> > It corresponds to Documentation/devicetree/bindings/fsl,imx28-saif
> > 
> > Signed-off-by: Lukasz Majewski <lukma@...x.de>
> > ---
> >  .../devicetree/bindings/sound/fsl,saif.yaml   | 79
> > +++++++++++++++++++ 1 file changed, 79 insertions(+)  
> 
> There is a binding. Please perform conversion from TXT to DT schema,
> mentioning in commit msg any changes from pure conversion (e.g. new
> properties to match DTS).

Hmm.... OK.

> 
> Few more comments below.
> 
> >  create mode 100644
> > Documentation/devicetree/bindings/sound/fsl,saif.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/sound/fsl,saif.yaml
> > b/Documentation/devicetree/bindings/sound/fsl,saif.yaml new file
> > mode 100644 index 000000000000..747faa411a50
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/sound/fsl,saif.yaml
> > @@ -0,0 +1,79 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/sound/fsl,saif.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Freescale MXS Serial Audio Interface (SAIF)
> > +
> > +maintainers:
> > +  - Lukasz Majewski <lukma@...x.de>
> > +
> > +description: |  
> 
> Do not need '|' unless you need to preserve formatting.

Ok.

> 
> > +  The SAIF is based on I2S module that is used to communicate with
> > audio codecs,
> > +  but only with half-duplex manner (i.e. it can either transmit or
> > receive PCM
> > +  audio).
> > +
> > +properties:
> > +  compatible:
> > +    const: fsl,imx28-saif
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  "#sound-dai-cells":
> > +    const: 0
> > +
> > +  assigned-clock-parents: true
> > +  assigned-clock-rates: true
> > +  assigned-clocks: true  
> 
> These three should be dropped, redundant.

Last two are present in definition of saif[01] in imx28.dtsi - so IMHO
it shall be added.

Moreover, those are present in fsl,sg5000.yaml dt-schema description.

> 
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  dmas:
> > +    maxItems: 1
> > +
> > +  dma-names:
> > +    const: rx-tx
> > +
> > +  clocks:
> > +    maxItems: 1
> > +
> > +  fsl,saif-master:
> > +    description: Indicate that saif is a slave and its phandle
> > points to master
> > +    $ref: /schemas/types.yaml#/definitions/phandle
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +  - dmas
> > +  - dma-names
> > +  - "#sound-dai-cells"  
> 
> Keep the same order as in "properties:" block.

Ok.

> 
> and here allOf: with $ref to dai-common.yaml

Ok.

> 
> > +
> > +unevaluatedProperties: false
> > +
> > +examples:
> > +  - |
> > +    saif0: saif@...42000 {
> > +        #sound-dai-cells = <0>;
> > +        compatible = "fsl,imx28-saif";
> > +        reg = <0x80042000 2000>;
> > +        interrupts = <59>;
> > +        clocks = <&clks 53>;
> > +        dmas = <&dma_apbx 4>;
> > +        dma-names = "rx-tx";
> > +    };
> > +  - |
> > +    saif1: saif@...46000 {  
> 
> Just one example, could be this one as more complete.

This is important, as saif1 has "fsl,saif-master" which allows to have
full duplex PCM communication (by default on imx28 single saif is
half-duplex).

> 
> > +        #sound-dai-cells = <0>;  
> 
> Keep it after "reg" (compatible and reg are always first).

Ok.

> 
> Best regards,
> Krzysztof
> 




Best regards,

Lukasz Majewski

--

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