linux-kernel - Re: [PATCH v6 6/7] arm64: dts: imx8m: update spdif sound card node properties

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Message-ID: <905560330.155045.1724067809890.JavaMail.zimbra@savoirfairelinux.com>
Date: Mon, 19 Aug 2024 07:43:29 -0400 (EDT)
From: Elinor Montmasson <elinor.montmasson@...oirfairelinux.com>
To: Shawn Guo <shawnguo2@...h.net>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
	Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, 
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, 
	Sascha Hauer <s.hauer@...gutronix.de>, 
	Fabio Estevam <festevam@...il.com>, 
	Russell King <linux@...linux.org.uk>, 
	Catalin Marinas <catalin.marinas@....com>, 
	Will Deacon <will@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, 
	Takashi Iwai <tiwai@...e.com>, 
	shengjiu wang <shengjiu.wang@...il.com>, 
	Xiubo Lee <Xiubo.Lee@...il.com>, 
	Nicolin Chen <nicoleotsuka@...il.com>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, 
	linux-sound <linux-sound@...r.kernel.org>, 
	devicetree <devicetree@...r.kernel.org>, imx <imx@...ts.linux.dev>, 
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>, 
	linux-kernel <linux-kernel@...r.kernel.org>, 
	alsa-devel <alsa-devel@...a-project.org>, 
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, 
	Philip-Dylan Gleonec <philip-dylan.gleonec@...oirfairelinux.com>
Subject: Re: [PATCH v6 6/7] arm64: dts: imx8m: update spdif sound card node
 properties

> From: "Shawn Guo" <shawnguo2@...h.net>
> Sent: Sunday, 4 August, 2024 16:31:11
> On Thu, Jun 27, 2024 at 10:31:03AM +0200, Elinor Montmasson wrote:
>> The merge of imx-spdif driver into fsl-asoc-card brought
>> new DT properties that can be used with the "fsl,imx-audio-spdif"
>> compatible:
>> * The "spdif-controller" property from imx-spdif is named "audio-cpu"
>>   in fsl-asoc-card.
>> * fsl-asoc-card uses codecs explicitly declared in DT
>>   with "audio-codec".
>>   With an S/PDIF, codec drivers spdif_transmitter and
>>   spdif_receiver should be used.
>>   Driver imx-spdif used instead the dummy codec and a pair of
>>   boolean properties, "spdif-in" and "spdif-out".
>> 
>> While backward compatibility is kept to support properties
>> "spdif-controller", "spdif-in" and "spdif-out", using new properties has
>> several benefits:
>> * "audio-cpu" and "audio-codec" are more generic names reflecting
>>   that the fsl-asoc-card driver supports multiple hardware.
>>   They are properties already used by devices using the
>>   fsl-asoc-card driver.
>>   They are also similar to properties of simple-card: "cpu" and "codec".
>> * "spdif-in" and "spdif-out" imply the use of the dummy codec in the
>>   driver. However, there are already two codec drivers for the S/PDIF,
>>   spdif_transmitter and spdif_receiver.
>>   It is better to declare S/PDIF Tx and Rx devices in a DT, and then
>>   reference them with "audio-codec" than using the dummy codec.
>> 
>> For those reasons, this commit updates in-tree DTs to use the new
>> properties:
>> * Rename "spdif-controller" property to "audio-cpu".
>> * Declare S/PDIF transmitter and/or receiver devices, and use them with
>>   the "audio-codec" property instead of "spdif-out" and/or "spdif-in".
>> 
>> These modifications were tested only on an imx8mn-evk board.
>> 
>> Note that out-of-tree and old DTs are still supported.
>> 
>> Signed-off-by: Elinor Montmasson <elinor.montmasson@...oirfairelinux.com>
>> ---
>>  arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi | 15 +++++++++---
>>  arch/arm64/boot/dts/freescale/imx8mn-evk.dtsi | 15 +++++++++---
>>  arch/arm64/boot/dts/freescale/imx8mq-evk.dts  | 24 +++++++++++++++----
>>  3 files changed, 43 insertions(+), 11 deletions(-)
>> 
>> diff --git a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
>> b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
>> index 90d1901df2b1..348855a41852 100644
>> --- a/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
>> +++ b/arch/arm64/boot/dts/freescale/imx8mm-evk.dtsi
>> @@ -180,12 +180,21 @@ cpu {
>>  		};
>>  	};
>>  
>> +	spdif_out: spdif-out {
>> +		#sound-dai-cells = <0>;
>> +		compatible = "linux,spdif-dit";
> 
> It's recommended that the property list begins with 'compatible'.  Could
> you flip them?
> 

Yes I'll will do this quickly, thank you.

Regards,
Elinor Montmasson