linux-kernel - Re: [PATCHv5 7/9] ASoC: dt-bindings: imx-audio-spdif: remove binding

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Date: Mon, 24 Jun 2024 04:51:47 -0400 (EDT)
From: Elinor Montmasson <elinor.montmasson@...oirfairelinux.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
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: [PATCHv5 7/9] ASoC: dt-bindings: imx-audio-spdif: remove
 binding

From: "Krzysztof Kozlowski" <krzk@...nel.org>
Sent: Sunday, 23 June, 2024 13:09:33
> On 20/06/2024 15:25, Elinor Montmasson wrote:
>> imx-audio-spdif was merged into the fsl-asoc-card driver, and therefore
>> removed.
> 
> So what happens with all existing users (e.g. DTS)? They become
> invalid/not supported?


Next commits, 8/9 and 9/9, update all DTS files that currently use
the "fsl,imx-audio-spdif" compatible.
>From the users point of view, currently configured spdif audio cards
will behave just the same.


> After quick look, I do not see backwards compatibility in the driver and
> above commit msg tells me nothing about ABI break.


For the next version I will state in this commit message the upcoming modifications to DTS
and compatibility, why it will be done, and that support for existing DTS is not dropped.

Previous `imx-spdif` driver used the dummy codec instead of
using declared spdif codecs. It was discussed in previous version of this contribution
that using the dummy codec isn't good practice. So one to one backward compatibility
isn't really possible.


Best regards,
Elinor Montmasson