From d76f41982f2fc88492efd96c7c3178044f32e125 Mon Sep 17 00:00:00 2001 From: Anatol Pomozov Date: Mon, 31 Aug 2015 08:24:23 -0700 Subject: [PATCH] ASoC: Document snd-soc-dummy-dai purpose Signed-off-by: Anatol Pomozov Signed-off-by: Mark Brown --- sound/soc/soc-utils.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/sound/soc/soc-utils.c b/sound/soc/soc-utils.c index 362c69ac1d6c..53dd085d3ee2 100644 --- a/sound/soc/soc-utils.c +++ b/sound/soc/soc-utils.c @@ -101,6 +101,15 @@ static struct snd_soc_codec_driver dummy_codec; SNDRV_PCM_FMTBIT_S32_LE | \ SNDRV_PCM_FMTBIT_U32_LE | \ SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE) +/* + * The dummy CODEC is only meant to be used in situations where there is no + * actual hardware. + * + * If there is actual hardware even if it does not have a control bus + * the hardware will still have constraints like supported samplerates, etc. + * which should be modelled. And the data flow graph also should be modelled + * using DAPM. + */ static struct snd_soc_dai_driver dummy_dai = { .name = "snd-soc-dummy-dai", .playback = {