linux-kernel - Re: [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock

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Date:   Thu, 11 Mar 2021 16:35:03 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Michael Walle <michael@...le.cc>
CC:     <alsa-devel@...a-project.org>, <broonie@...nel.org>,
        <devicetree@...r.kernel.org>, <jonathanh@...dia.com>,
        <kuninori.morimoto.gx@...esas.com>, <linux-kernel@...r.kernel.org>,
        <linux-tegra@...r.kernel.org>, <robh@...nel.org>,
        <sharadg@...dia.com>, <thierry.reding@...il.com>
Subject: Re: [PATCH 1/3] ASoC: simple-card-utils: Fix device module clock



On 3/11/2021 3:57 PM, Michael Walle wrote:
> I've had a closer look at this and it seems you're messing around
> with the clock of the codec's node (which is _not_ a subnode of
> the simple-audio-card). I don't think this is correct.
>
> I guess you should rather set the clock property in the codec
> subnode of the simple-audio-card, which is then picked up by the
> simple-audio-card driver and changed accordingly.
>
> For example:
>                simple-audio-card,dai-link@0 {
>                        reg = <0>;
>                        bitclock-master = <&dailink0_master>;
>                        frame-master = <&dailink0_master>;
>                        format = "i2s";
>
>                        cpu {
>                                sound-dai = <&sai6>;
>                        };
>
>                        dailink0_master: codec {
>                                sound-dai = <&wm8904>;
>                                clocks = <&mclk>;
>                        };
>                };
>
> In this case mclk will be enabled and disabled accordingly.
>
> Could you test this?
>

It would work and initially I had similar patch, see [0] and related 
series. Suggestion is to always use "clocks" property with devices only.


[0] 
https://patchwork.kernel.org/project/alsa-devel/patch/1611944866-29373-4-git-send-email-spujar@nvidia.com/