linux-kernel - Re: [alsa-devel] [PATCH v3 2/4] ASoC: simple-card: dynamically allocate the DAI link and properties

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Date:	Mon, 17 Mar 2014 11:29:42 +0200
From:	Jyri Sarha <jsarha@...com>
To:	Jean-Francois Moine <moinejf@...e.fr>,
	Mark Brown <broonie@...nel.org>
CC:	<alsa-devel@...a-project.org>, Xiubo Li <Li.Xiubo@...escale.com>,
	<linux-kernel@...r.kernel.org>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Subject: Re: [alsa-devel] [PATCH v3 2/4] ASoC: simple-card: dynamically allocate
 the DAI link and properties

On 03/15/2014 01:09 PM, Jean-Francois Moine wrote:
> The DAI link array and the properties (fmt, sysclk slots) are
> hard-coded for a single CPU / CODEC link.
>
> This patch dynamically allocates the DAI link array and the
> properties with the aim of supporting many DAI links.
>
> Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
> ---
>   sound/soc/generic/simple-card.c | 49 +++++++++++++++++++++++++----------------
>   1 file changed, 30 insertions(+), 19 deletions(-)
>
> diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
> index ca7e63e..a55dc46 100644
> --- a/sound/soc/generic/simple-card.c
> +++ b/sound/soc/generic/simple-card.c
> @@ -20,9 +20,11 @@
>
>   struct simple_card_data {
>   	struct snd_soc_card snd_card;
> -	struct asoc_simple_dai cpu_dai;
> -	struct asoc_simple_dai codec_dai;
> -	struct snd_soc_dai_link snd_link;
> +	struct simple_dais {
> +		struct asoc_simple_dai cpu_dai;
> +		struct asoc_simple_dai codec_dai;
> +	} *dais;
> +	struct snd_soc_dai_link dai_link[];	/* dynamically allocated */
>   };
>

This is only an implementation detail, but wouldn't it produce a cleaner 
implementation if you would write the above structure like this:

   struct simple_card_data {
   	struct snd_soc_card snd_card;
	struct simple_dai_links {
		struct snd_soc_dai_link dai_link;
		struct asoc_simple_dai cpu_dai;
		struct asoc_simple_dai codec_dai;
	} *dai_links;
   };

or even

   struct simple_card_data {
   	struct snd_soc_card snd_card;
	struct simple_dai_links {
		struct snd_soc_dai_link dai_link;
		struct asoc_simple_dai cpu_dai;
		struct asoc_simple_dai codec_dai;
	} dai_links[]; /* dynamically allocated */
   };

But, as said this only an implementation detail.

Best regards,
Jyri
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