linux-kernel - Re: [EXTERNAL] Re: [PATCH v3 4/4] ASoc: dt-bindings: PCM6240: Add initial DT binding

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Message-ID: <ZcNbMWgcDNNXAA08@finisterre.sirena.org.uk>
Date: Wed, 7 Feb 2024 10:28:01 +0000
From: Mark Brown <broonie@...nel.org>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc: "Ding, Shenghao" <shenghao-ding@...com>,
	"conor+dt@...nel.org" <conor+dt@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"robh+dt@...nel.org" <robh+dt@...nel.org>,
	"andriy.shevchenko@...ux.intel.com" <andriy.shevchenko@...ux.intel.com>,
	"linux-sound@...r.kernel.org" <linux-sound@...r.kernel.org>,
	"liam.r.girdwood@...el.com" <liam.r.girdwood@...el.com>,
	"lgirdwood@...il.com" <lgirdwood@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Lu, Kevin" <kevin-lu@...com>, "Xu, Baojun" <baojun.xu@...com>,
	"P O, Vijeth" <v-po@...com>,
	"Navada Kanyana, Mukund" <navada@...com>,
	"perex@...ex.cz" <perex@...ex.cz>,
	"McPherson, Jeff" <j-mcpherson@...com>,
	"pierre-louis.bossart@...ux.intel.com" <pierre-louis.bossart@...ux.intel.com>,
	"13916275206@....com" <13916275206@....com>,
	"Chawla, Mohit" <mohit.chawla@...com>,
	"soyer@....hu" <soyer@....hu>, "Huang, Jonathan" <jkhuang3@...com>,
	"tiwai@...e.de" <tiwai@...e.de>, "Djuandi, Peter" <pdjuandi@...com>,
	"Agrawal, Manisha" <manisha.agrawal@...com>,
	"Hari, Raj" <s-hari@...com>, "Yashar, Avi" <aviel@...com>,
	"Nagalla, Hari" <hnagalla@...com>,
	"Bajjuri, Praneeth" <praneeth@...com>
Subject: Re: [EXTERNAL] Re: [PATCH v3 4/4] ASoc: dt-bindings: PCM6240: Add
 initial DT binding

On Wed, Feb 07, 2024 at 10:53:28AM +0100, Krzysztof Kozlowski wrote:
> On 07/02/2024 10:47, Ding, Shenghao wrote:

> > dix4192 is not traditional ADC or DAC, but an Integrated Digital Audio Interface 
> > Receiver and Transmitter, like an audio bridge to connect different digital audio 
> > protocol, compatible with the AES3, S/PDIF, IEC 60958, and EIAJ CP-1201 
> > interface standards, Left-Justified, Right-Justified, and Philips I2S™ Data Formats. 
> > So keep it alone for professional purpose. 

> Hm, it is a bit surprising to see some PCM6240-compatible devices 100%
> different from other PCM6240-compatible. PCM6240 is ADC. DIX4192 is not
> ADC, not even DAC. How can it be compatible with PCM6240 in such case?

I don't know about this specific example but many modern CODECs have a
substantial digital component which can usefully be used separately to
the analog components in some system designs, sometimes that's still got
the digital parts of the ADCs/DACs as PDM inputs and outputs are used
but not always even that.  We have some devices that are just pure
S/PDIF bridges in tree already, and the WM8996 is an example of a CODEC
with only PDM.

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