linux-kernel - Re: [PATCH v1] dt-bindings: dsp: mediatek: add mt8186 dsp document

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Date:   Thu, 2 Jun 2022 18:19:36 +0800
From:   Tinghan Shen <tinghan.shen@...iatek.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        "Matthias Brugger" <matthias.bgg@...il.com>
CC:     <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v1] dt-bindings: dsp: mediatek: add mt8186 dsp document

Hi Krzysztof,

On Thu, 2022-06-02 at 09:40 +0200, Krzysztof Kozlowski wrote:
> On 02/06/2022 08:44, Tinghan Shen wrote:
> > > > +  mbox-names:
> > > > +    items:
> > > > +      - const: mbox0
> > > > +      - const: mbox1
> > > 
> > > These should be rather some meaningful names, e.g. "rx" and "tx".
> > 
> > The mbox name has to align with the adsp ipc driver.
> > The adsp ipc driver is using 'mbox%d' for mailbox channels.
> > 
> > 
> > 
https://urldefense.com/v3/__https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?id=9db69df4bdd37eb1f65b6931ee067fb15b9a4d5c__;!!CTRNKA9wMg0ARbw!1TmempNkQhC5QuLBhyfWo_AC97MoLuWipsGV-LPaW9RKNPheU7Bgc-eboNi1JA1nC5I$
> >  
> > 
> > 	chan_name = kasprintf(GFP_KERNEL, "mbox%d", i);
> > 
> > 	/* ...snip... */
> > 
> > 	adsp_chan->ch = mbox_request_channel_byname(cl, chan_name);
> > 
> > Is it ok to continue using these names?
> 
> It is a bit confusing... how did that driver got merged recently without
> bindings? Why bindings are separate?
> 
> The bindings always come together in one patchset with the driver
> implementing them. Bindings are though a separate patch, yet still
> followed by the driver which uses them.
> 
> I do not see any compatibles in that driver, which suggests there is no
> other binding using it. If that's correct, then you need to change the
> driver.
> 

The mtk-adsp-ipc driver's sole function is to encapsulate the operations 
of mailbox framework from adsp ipc users. The mtk-adsp-ipc is not defined 
in the dts file and we don't need it to be defined. The creation of mtk-adsp-ipc 
device is requested by adsp ipc users via the use of 'platform_device_register_data'[1].

the driver implemented the mailbox framework is 'mtk-adsp-mailbox'[2]. it has 
corresponding hardwares and a yaml file[3] to describe it.

I'll send a patch to change the mbox name at next version.
It's better to have some meaningful names as you said.

[1] 
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?id=e0100bfd383c7d994d2e957e85ca56a5fe5a3f43
[2] 
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?id=af2dfa96c52d042df5deb29fb6e32d3ff4d76a61
[3] 
https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git/commit/?id=afa092e1e8824363d3174fef329c034445c111d5

Thanks,
TingHan