€•	3      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ,/translations/zh_CN/sound/soc/codec-to-codec”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ,/translations/zh_TW/sound/soc/codec-to-codec”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ,/translations/it_IT/sound/soc/codec-to-codec”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ,/translations/ja_JP/sound/soc/codec-to-codec”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ,/translations/ko_KR/sound/soc/codec-to-codec”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ,/translations/sp_SP/sound/soc/codec-to-codec”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒ.Creating codec to codec dai link for ALSA dapm”h]”hŒ.Creating codec to codec dai link for ALSA dapm”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒF/var/lib/git/docbuild/linux/Documentation/sound/soc/codec-to-codec.rst”h KubhŒ	paragraph”“”)”}”(hŒZMostly the flow of audio is always from CPU to codec so your system
will look as below:
::”h]”hŒWMostly the flow of audio is always from CPU to codec so your system
will look as below:”…””}”(hh¹hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubhŒliteral_block”“”)”}”(hŒ– ---------          ---------
|         |  dai   |         |
    CPU    ------->    codec
|         |        |         |
 ---------          ---------”h]”hŒ– ---------          ---------
|         |  dai   |         |
    CPU    ------->    codec
|         |        |         |
 ---------          ---------”…””}”hhÉsbah}”(h]”h ]”h"]”h$]”h&]”Œ	xml:space”Œpreserve”uh1hÇhŸh¶h K	hh£hžhubh¸)”}”(hŒ&In case your system looks as below:
::”h]”hŒ#In case your system looks as below:”…””}”(hhÙhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Khh£hžhubhÈ)”}”(hXx                       ---------
                    |         |
                      codec-2
                    |         |
                    ---------
                         |
                       dai-2
                         |
 ----------          ---------
|          |  dai-1 |         |
    CPU     ------->  codec-1
|          |        |         |
 ----------          ---------
                         |
                       dai-3
                         |
                     ---------
                    |         |
                      codec-3
                    |         |
                     ---------”h]”hXx                       ---------
                    |         |
                      codec-2
                    |         |
                    ---------
                         |
                       dai-2
                         |
 ----------          ---------
|          |  dai-1 |         |
    CPU     ------->  codec-1
|          |        |         |
 ----------          ---------
                         |
                       dai-3
                         |
                     ---------
                    |         |
                      codec-3
                    |         |
                     ---------”…””}”hhçsbah}”(h]”h ]”h"]”h$]”h&]”h×hØuh1hÇhŸh¶h Khh£hžhubh¸)”}”(hX6  Suppose codec-2 is a bluetooth chip and codec-3 is connected to
a speaker and you have a below scenario:
codec-2 will receive the audio data and the user wants to play that
audio through codec-3 without involving the CPU.This
aforementioned case is the ideal case when codec to codec
connection should be used.”h]”hX6  Suppose codec-2 is a bluetooth chip and codec-3 is connected to
a speaker and you have a below scenario:
codec-2 will receive the audio data and the user wants to play that
audio through codec-3 without involving the CPU.This
aforementioned case is the ideal case when codec to codec
connection should be used.”…””}”(hhõhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K(hh£hžhubh¸)”}”(hŒ=Your dai_link should appear as below in your machine
file:
::”h]”hŒ:Your dai_link should appear as below in your machine
file:”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K/hh£hžhubhÈ)”}”(hXï  /*
 * this pcm stream only supports 24 bit, 2 channel and
 * 48k sampling rate.
 */
static const struct snd_soc_pcm_stream dsp_codec_params = {
       .formats = SNDRV_PCM_FMTBIT_S24_LE,
       .rate_min = 48000,
       .rate_max = 48000,
       .channels_min = 2,
       .channels_max = 2,
};

{
   .name = "CPU-DSP",
   .stream_name = "CPU-DSP",
   .cpu_dai_name = "samsung-i2s.0",
   .codec_name = "codec-2,
   .codec_dai_name = "codec-2-dai_name",
   .platform_name = "samsung-i2s.0",
   .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
           | SND_SOC_DAIFMT_CBP_CFP,
   .ignore_suspend = 1,
   .c2c_params = &dsp_codec_params,
   .num_c2c_params = 1,
},
{
   .name = "DSP-CODEC",
   .stream_name = "DSP-CODEC",
   .cpu_dai_name = "wm0010-sdi2",
   .codec_name = "codec-3,
   .codec_dai_name = "codec-3-dai_name",
   .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
           | SND_SOC_DAIFMT_CBP_CFP,
   .ignore_suspend = 1,
   .c2c_params = &dsp_codec_params,
   .num_c2c_params = 1,
},”h]”hXï  /*
 * this pcm stream only supports 24 bit, 2 channel and
 * 48k sampling rate.
 */
static const struct snd_soc_pcm_stream dsp_codec_params = {
       .formats = SNDRV_PCM_FMTBIT_S24_LE,
       .rate_min = 48000,
       .rate_max = 48000,
       .channels_min = 2,
       .channels_max = 2,
};

{
   .name = "CPU-DSP",
   .stream_name = "CPU-DSP",
   .cpu_dai_name = "samsung-i2s.0",
   .codec_name = "codec-2,
   .codec_dai_name = "codec-2-dai_name",
   .platform_name = "samsung-i2s.0",
   .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
           | SND_SOC_DAIFMT_CBP_CFP,
   .ignore_suspend = 1,
   .c2c_params = &dsp_codec_params,
   .num_c2c_params = 1,
},
{
   .name = "DSP-CODEC",
   .stream_name = "DSP-CODEC",
   .cpu_dai_name = "wm0010-sdi2",
   .codec_name = "codec-3,
   .codec_dai_name = "codec-3-dai_name",
   .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF
           | SND_SOC_DAIFMT_CBP_CFP,
   .ignore_suspend = 1,
   .c2c_params = &dsp_codec_params,
   .num_c2c_params = 1,
},”…””}”hj  sbah}”(h]”h ]”h"]”h$]”h&]”h×hØuh1hÇhŸh¶h K3hh£hžhubh¸)”}”(hŒBAbove code snippet is motivated from sound/soc/samsung/speyside.c.”h]”hŒBAbove code snippet is motivated from sound/soc/samsung/speyside.c.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h KYhh£hžhubh¸)”}”(hŒjNote the "c2c_params" callback which lets the dapm know that this
dai_link is a codec to codec connection.”h]”hŒnNote the â€œc2c_paramsâ€ callback which lets the dapm know that this
dai_link is a codec to codec connection.”…””}”(hj-  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K[hh£hžhubh¸)”}”(hX[  In dapm core a route is created between cpu_dai playback widget
and codec_dai capture widget for playback path and vice-versa is
true for capture path. In order for this aforementioned route to get
triggered, DAPM needs to find a valid endpoint which could be either
a sink or source widget corresponding to playback and capture path
respectively.”h]”hX[  In dapm core a route is created between cpu_dai playback widget
and codec_dai capture widget for playback path and vice-versa is
true for capture path. In order for this aforementioned route to get
triggered, DAPM needs to find a valid endpoint which could be either
a sink or source widget corresponding to playback and capture path
respectively.”…””}”(hj;  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h K^hh£hžhubh¸)”}”(hŒÎIn order to trigger this dai_link widget, a thin codec driver for
the speaker amp can be created as demonstrated in wm8727.c file, it
sets appropriate constraints for the device even if it needs no control.”h]”hŒÎIn order to trigger this dai_link widget, a thin codec driver for
the speaker amp can be created as demonstrated in wm8727.c file, it
sets appropriate constraints for the device even if it needs no control.”…””}”(hjI  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kehh£hžhubh¸)”}”(hŒÂMake sure to name your corresponding cpu and codec playback and capture
dai names ending with "Playback" and "Capture" respectively as dapm core
will link and power those dais based on the name.”h]”hŒÊMake sure to name your corresponding cpu and codec playback and capture
dai names ending with â€œPlaybackâ€ and â€œCaptureâ€ respectively as dapm core
will link and power those dais based on the name.”…””}”(hjW  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kihh£hžhubh¸)”}”(hXÖ  A dai_link in a "simple-audio-card" will automatically be detected as
codec to codec when all DAIs on the link belong to codec components.
The dai_link will be initialized with the subset of stream parameters
(channels, format, sample rate) supported by all DAIs on the link. Since
there is no way to provide these parameters in the device tree, this is
mostly useful for communication with simple fixed-function codecs, such
as a Bluetooth controller or cellular modem.”h]”hXÚ  A dai_link in a â€œsimple-audio-cardâ€ will automatically be detected as
codec to codec when all DAIs on the link belong to codec components.
The dai_link will be initialized with the subset of stream parameters
(channels, format, sample rate) supported by all DAIs on the link. Since
there is no way to provide these parameters in the device tree, this is
mostly useful for communication with simple fixed-function codecs, such
as a Bluetooth controller or cellular modem.”…””}”(hje  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hŸh¶h Kmhh£hžhubeh}”(h]”Œ.creating-codec-to-codec-dai-link-for-alsa-dapm”ah ]”h"]”Œ.creating codec to codec dai link for alsa dapm”ah$]”h&]”uh1h¡hhhžhhŸh¶h Kubeh}”(h]”h ]”h"]”h$]”h&]”Œsource”h¶uh1hŒcurrent_source”NŒcurrent_line”NŒsettings”Œdocutils.frontend”ŒValues”“”)”}”(h¦NŒ	generator”NŒ	datestamp”NŒsource_link”NŒ
source_url”NŒtoc_backlinks”Œentry”Œfootnote_backlinks”KŒsectnum_xform”KŒstrip_comments”NŒstrip_elements_with_classes”NŒstrip_classes”NŒreport_level”KŒ
halt_level”KŒexit_status_level”KŒdebug”NŒwarning_stream”NŒ	traceback”ˆŒinput_encoding”Œ	utf-8-sig”Œinput_encoding_error_handler”Œstrict”Œoutput_encoding”Œutf-8”Œoutput_encoding_error_handler”jž  Œerror_encoding”Œutf-8”Œerror_encoding_error_handler”Œbackslashreplace”Œlanguage_code”Œen”Œrecord_dependencies”NŒconfig”NŒ	id_prefix”hŒauto_id_prefix”Œid”Œdump_settings”NŒdump_internals”NŒdump_transforms”NŒdump_pseudo_xml”NŒexpose_internals”NŒstrict_visitor”NŒ_disable_config”NŒ_source”h¶Œ_destination”NŒ_config_files”]”Œ7/var/lib/git/docbuild/linux/Documentation/docutils.conf”aŒfile_insertion_enabled”ˆŒraw_enabled”KŒline_length_limit”M'Œpep_references”NŒpep_base_url”Œhttps://peps.python.org/”Œpep_file_url_template”Œpep-%04d”Œrfc_references”NŒrfc_base_url”Œ&https://datatracker.ietf.org/doc/html/”Œ	tab_width”KŒtrim_footnote_reference_space”‰Œsyntax_highlight”Œlong”Œsmart_quotes”ˆŒsmartquotes_locales”]”Œcharacter_level_inline_markup”‰Œdoctitle_xform”‰Œdocinfo_xform”KŒsectsubtitle_xform”‰Œimage_loading”Œlink”Œembed_stylesheet”‰Œcloak_email_addresses”ˆŒsection_self_link”‰Œenv”NubŒreporter”NŒindirect_targets”]”Œsubstitution_defs”}”Œsubstitution_names”}”Œrefnames”}”Œrefids”}”Œnameids”}”jx  ju  sŒ	nametypes”}”jx  ‰sh}”ju  h£sŒfootnote_refs”}”Œcitation_refs”}”Œautofootnotes”]”Œautofootnote_refs”]”Œsymbol_footnotes”]”Œsymbol_footnote_refs”]”Œ	footnotes”]”Œ	citations”]”Œautofootnote_start”KŒsymbol_footnote_start”K Œ
id_counter”Œcollections”ŒCounter”“”}”…”R”Œparse_messages”]”hŒsystem_message”“”)”}”(hhh]”h¸)”}”(hŒfPossible title underline, too short for the title.
Treating it as ordinary text because it's so short.”h]”hŒhPossible title underline, too short for the title.
Treating it as ordinary text because itâ€™s so short.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h·hj  ubah}”(h]”h ]”h"]”h$]”h&]”Œlevel”KŒtype”ŒINFO”Œline”KŒsource”h¶uh1j   hh£hžhhŸh¶h KubaŒtransform_messages”]”Œtransformer”NŒinclude_log”]”Œ
decoration”Nhžhub.