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authorMauro Carvalho Chehab <mchehab@s-opensource.com>2017-07-17 11:17:36 -0300
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2017-07-17 11:17:36 -0300
commita3db9d60a118571e696b684a6e8c692a2b064941 (patch)
treeff7bae0f79b7a2ee0bce03de4f883550200c52a9 /Documentation/devicetree/bindings/sound/simple-scu-card.txt
parentmedia: staging: cxd2099: Activate cxd2099 buffer mode (diff)
parentLinux v4.13-rc1 (diff)
downloadlinux-dev-a3db9d60a118571e696b684a6e8c692a2b064941.tar.xz
linux-dev-a3db9d60a118571e696b684a6e8c692a2b064941.zip
Merge tag 'v4.13-rc1' into patchwork
Linux v4.13-rc1 * tag 'v4.13-rc1': (11136 commits) Linux v4.13-rc1 random: reorder READ_ONCE() in get_random_uXX random: suppress spammy warnings about unseeded randomness replace incorrect strscpy use in FORTIFY_SOURCE kmod: throttle kmod thread limit kmod: add test driver to stress test the module loader MAINTAINERS: give kmod some maintainer love xtensa: use generic fb.h fault-inject: add /proc/<pid>/fail-nth fault-inject: simplify access check for fail-nth fault-inject: make fail-nth read/write interface symmetric fault-inject: parse as natural 1-based value for fail-nth write interface fault-inject: automatically detect the number base for fail-nth write interface kernel/watchdog.c: use better pr_fmt prefix MAINTAINERS: move the befs tree to kernel.org lib/atomic64_test.c: add a test that atomic64_inc_not_zero() returns an int mm: fix overflow check in expand_upwards() ubifs: Set double hash cookie also for RENAME_EXCHANGE ubifs: Massage assert in ubifs_xattr_set() wrt. init_xattrs ubifs: Don't leak kernel memory to the MTD ...
Diffstat (limited to 'Documentation/devicetree/bindings/sound/simple-scu-card.txt')
-rw-r--r--Documentation/devicetree/bindings/sound/simple-scu-card.txt67
1 files changed, 25 insertions, 42 deletions
diff --git a/Documentation/devicetree/bindings/sound/simple-scu-card.txt b/Documentation/devicetree/bindings/sound/simple-scu-card.txt
index d6fe47ed09af..327d229a51b2 100644
--- a/Documentation/devicetree/bindings/sound/simple-scu-card.txt
+++ b/Documentation/devicetree/bindings/sound/simple-scu-card.txt
@@ -1,35 +1,29 @@
-ASoC simple SCU Sound Card
+ASoC Simple SCU Sound Card
-Simple-Card specifies audio DAI connections of SoC <-> codec.
+Simple SCU Sound Card is "Simple Sound Card" + "ALSA DPCM".
+For example, you can use this driver if you want to exchange sampling rate convert,
+Mixing, etc...
Required properties:
- compatible : "simple-scu-audio-card"
"renesas,rsrc-card"
-
Optional properties:
-- simple-audio-card,name : User specified audio sound card name, one string
- property.
-- simple-audio-card,cpu : CPU sub-node
-- simple-audio-card,codec : CODEC sub-node
+- simple-audio-card,name : see simple-audio-card.txt
+- simple-audio-card,cpu : see simple-audio-card.txt
+- simple-audio-card,codec : see simple-audio-card.txt
Optional subnode properties:
-- simple-audio-card,format : CPU/CODEC common audio format.
- "i2s", "right_j", "left_j" , "dsp_a"
- "dsp_b", "ac97", "pdm", "msb", "lsb"
-- simple-audio-card,frame-master : Indicates dai-link frame master.
- phandle to a cpu or codec subnode.
-- simple-audio-card,bitclock-master : Indicates dai-link bit clock master.
- phandle to a cpu or codec subnode.
-- simple-audio-card,bitclock-inversion : bool property. Add this if the
- dai-link uses bit clock inversion.
-- simple-audio-card,frame-inversion : bool property. Add this if the
- dai-link uses frame clock inversion.
+- simple-audio-card,format : see simple-audio-card.txt
+- simple-audio-card,frame-master : see simple-audio-card.txt
+- simple-audio-card,bitclock-master : see simple-audio-card.txt
+- simple-audio-card,bitclock-inversion : see simple-audio-card.txt
+- simple-audio-card,frame-inversion : see simple-audio-card.txt
- simple-audio-card,convert-rate : platform specified sampling rate convert
- simple-audio-card,convert-channels : platform specified converted channel size (2 - 8 ch)
-- simple-audio-card,prefix : see audio-routing
+- simple-audio-card,prefix : see routing
- simple-audio-card,routing : A list of the connections between audio components.
Each entry is a pair of strings, the first being the connection's sink,
the second being the connection's source. Valid names for sources.
@@ -38,32 +32,23 @@ Optional subnode properties:
Required CPU/CODEC subnodes properties:
-- sound-dai : phandle and port of CPU/CODEC
+- sound-dai : see simple-audio-card.txt
Optional CPU/CODEC subnodes properties:
-- clocks / system-clock-frequency : specify subnode's clock if needed.
- it can be specified via "clocks" if system has
- clock node (= common clock), or "system-clock-frequency"
- (if system doens't support common clock)
- If a clock is specified, it is
- enabled with clk_prepare_enable()
- in dai startup() and disabled with
- clk_disable_unprepare() in dai
- shutdown().
+- clocks / system-clock-frequency : see simple-audio-card.txt
-Example 1. Sampling Rate Covert
+Example 1. Sampling Rate Conversion
sound {
compatible = "simple-scu-audio-card";
simple-audio-card,name = "rsnd-ak4643";
simple-audio-card,format = "left_j";
- simple-audio-card,format = "left_j";
simple-audio-card,bitclock-master = <&sndcodec>;
simple-audio-card,frame-master = <&sndcodec>;
- simple-audio-card,convert-rate = <48000>; /* see audio_clk_a */
+ simple-audio-card,convert-rate = <48000>;
simple-audio-card,prefix = "ak4642";
simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
@@ -79,20 +64,18 @@ sound {
};
};
-Example 2. 2 CPU 1 Codec
+Example 2. 2 CPU 1 Codec (Mixing)
sound {
- compatible = "renesas,rsrc-card";
-
- card-name = "rsnd-ak4643";
- format = "left_j";
- bitclock-master = <&dpcmcpu>;
- frame-master = <&dpcmcpu>;
+ compatible = "simple-scu-audio-card";
- convert-rate = <48000>; /* see audio_clk_a */
+ simple-audio-card,name = "rsnd-ak4643";
+ simple-audio-card,format = "left_j";
+ simple-audio-card,bitclock-master = <&dpcmcpu>;
+ simple-audio-card,frame-master = <&dpcmcpu>;
- audio-prefix = "ak4642";
- audio-routing = "ak4642 Playback", "DAI0 Playback",
+ simple-audio-card,prefix = "ak4642";
+ simple-audio-card,routing = "ak4642 Playback", "DAI0 Playback",
"ak4642 Playback", "DAI1 Playback";
dpcmcpu: cpu@0 {