linux-kernel - Re: [alsa-devel] [RFC][PATCH 1/3] ASoC: core: Move the default regmap I/O setting to snd_soc_register

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Date:	Tue, 04 Mar 2014 10:50:59 +0100
From:	Lars-Peter Clausen <lars@...afoo.de>
To:	Xiubo Li <Li.Xiubo@...escale.com>
CC:	broonie@...nel.org, lgirdwood@...il.com,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: Re: [alsa-devel] [RFC][PATCH 1/3] ASoC: core: Move the default regmap
 I/O setting to snd_soc_register_codec()

On 03/04/2014 09:25 AM, Xiubo Li wrote:
> Add the default regmap I/O setting to snd_soc_register_codec() while
> the CODEC is initialising, which will be called by CODEC driver device
> probe(), and then we can make set_cache_io() go away entirely from each
> CODEC ASoC probe.
>
> Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
> ---
>   include/sound/soc.h  |  3 +++
>   sound/soc/soc-core.c | 11 +++++++++++
>   2 files changed, 14 insertions(+)
>
> diff --git a/include/sound/soc.h b/include/sound/soc.h
> index 4c4d7e1..94bc1c4 100644
> --- a/include/sound/soc.h
> +++ b/include/sound/soc.h
> @@ -749,6 +749,9 @@ struct snd_soc_codec_driver {
>   	int (*set_pll)(struct snd_soc_codec *codec, int pll_id, int source,
>   		unsigned int freq_in, unsigned int freq_out);
>
> +	/* codec regmap */
> +	struct regmap *regmap;
> +

Nope. The driver struct is globally shared between all device instances, the 
regmap struct is device instance specific. The proper way to solve this is 
to have a function like snd_soc_register_codec_with_io() which takes a 
pointer to the regmap struct.
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