linux-kernel - Re: [PATCH v3 06/13] ASoC: simple-card-utils: Expose new members for asoc_simple

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Date:   Fri, 2 Oct 2020 14:29:06 +0530
From:   Sameer Pujar <spujar@...dia.com>
To:     Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
CC:     <broonie@...nel.org>, <lgirdwood@...il.com>, <robh+dt@...nel.org>,
        <pierre-louis.bossart@...ux.intel.com>, <perex@...ex.cz>,
        <tiwai@...e.com>, <thierry.reding@...il.com>,
        <jonathanh@...dia.com>, <alsa-devel@...a-project.org>,
        <devicetree@...r.kernel.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <sharadg@...dia.com>,
        <mkumard@...dia.com>, <viswanathl@...dia.com>,
        <rlokhande@...dia.com>, <dramesh@...dia.com>,
        <atalambedu@...dia.com>, <nwartikar@...dia.com>,
        <swarren@...dia.com>, <nicoleotsuka@...il.com>
Subject: Re: [PATCH v3 06/13] ASoC: simple-card-utils: Expose new members for
 asoc_simple_priv


>> diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
>> index 86a1e95..9825308 100644
>> --- a/include/sound/simple_card_utils.h
>> +++ b/include/sound/simple_card_utils.h
>> @@ -56,6 +56,10 @@ struct asoc_simple_priv {
>>        struct asoc_simple_dai *dais;
>>        struct snd_soc_codec_conf *codec_conf;
>>        struct gpio_desc *pa_gpio;
>> +     const struct snd_soc_ops *ops;
>> +     unsigned int force_dpcm:1;
>> +     uintptr_t dpcm_selectable;
>> +     void *data;
>>   };
> I have opinions about these.
>

> About dpcm_selectable, indeed current audio-graph is using it as "uintptr_t",
> but as you know, it checks whether it was non-NULL or not only.
> This means we can use it as bit-field.

Yes that is true. Something like this would work?

graph_probe(...)
{
     ...

     if (of_device_get_match_data(dev))
         priv->dpcm_selectable = 1;

     ...
}


>
> BTW, do we need to have dpcm_selectable at priv ?

Tegra audio graph driver does not require this because already it is 
populating 'force_dpcm' flag and having 'selectable' does not make much 
sense for it.

>
> One note is that, -scu- user is only me (locally),
> and it will be removed when audio-graph2 was created.
> (My plan is keep code for you, but remove compatible)

Right now I am just keeping it to allow current code work. Later you can 
remove this during graph2.

>
> About *data, I think we can avoid *data
> if driver side priv includes asoc_simple_priv ?
>
>          struct my_priv {
>                  struct asoc_simple_priv *simple;
>                  ...
>          };
>
>          #define simple_to_priv(_simple) container_of((_simple), struct my_priv, simple)
>

This seems like a better plan, will do this.