linux-kernel - RE: Re: [PATCH v2 4/4] ASoC: fsl: imx-rpmsg: Update to correct DT node

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Date: Mon, 11 Mar 2024 08:23:40 +0000
From: Chancel Liu <chancel.liu@....com>
To: Krzysztof Kozlowski <krzk@...nel.org>, "shengjiu.wang@...il.com"
	<shengjiu.wang@...il.com>, "Xiubo.Lee@...il.com" <Xiubo.Lee@...il.com>,
	"festevam@...il.com" <festevam@...il.com>, "nicoleotsuka@...il.com"
	<nicoleotsuka@...il.com>, "lgirdwood@...il.com" <lgirdwood@...il.com>,
	"broonie@...nel.org" <broonie@...nel.org>, "perex@...ex.cz" <perex@...ex.cz>,
	"tiwai@...e.com" <tiwai@...e.com>, "shawnguo@...nel.org"
	<shawnguo@...nel.org>, "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>, dl-linux-imx
	<linux-imx@....com>, "alsa-devel@...a-project.org"
	<alsa-devel@...a-project.org>, "linuxppc-dev@...ts.ozlabs.org"
	<linuxppc-dev@...ts.ozlabs.org>, "linux-sound@...r.kernel.org"
	<linux-sound@...r.kernel.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: Re: [PATCH v2 4/4] ASoC: fsl: imx-rpmsg: Update to correct DT
 node

> On 11/03/2024 08:33, Chancel Liu wrote:
> >>> @@ -127,6 +126,22 @@ static int imx_rpmsg_probe(struct
> platform_device
> >> *pdev)
> >>>               goto fail;
> >>>       }
> >>>
> >>> +     if (!strcmp(pdev->dev.platform_data, "rpmsg-micfil-channel"))
> >>> +             np = of_find_node_by_name(NULL, "rpmsg_micfil");
> >>> +     else
> >>> +             np = of_find_node_by_name(NULL, "rpmsg_audio");
> >>
> >> Why do you create ABI on node names? Where is it documented? Why
> can't
> >> you use phandles?
> >>
> >> Best regards,
> >> Krzysztof
> >
> > Thanks for your reminder. Truly I shouldn't use undocumented bindings. I
> will
> > use “fsl,rpmsg-channel-name” to refine patch set. Please help review next
> > version.
> 
> Instead of hard-coding node names in the driver you want to put it in
> "fsl,rpmsg-channel-name" property? I don't follow. I recommended instead
> using phandles, care to address that?

imx-rpmsg is ASoC machine driver and fsl_rpmsg is ASoC CPU DAI driver. In
imx-rpmsg, driver needs to get CPU DAI DT node for hardware configuration. So
imx-rpmsg needs some "information" to find the correct DT node. As you
recommended, it's not wise to use hard-coding node name. Also the device of
imx-rpmsg is created by imx-audio-rpmsg so it can't directly get phandle of CPU
DAI node.

Sorry for unclear statement. "fsl,rpmsg-channel-name" is the property of rpmsg
channel name. Each rpmsg sound card sits on one rpmsg channel. So I decide to
use rpmsg channel name to connect all parts of this sound card. If the CPU DAI
is registerd with rpmsg channel name then imx-rpmsg can easily get the DT node
by this name.

Regards, 
Chancel Liu