DAI links in ASoC can be turned into codec-to-codec links by populating
the .params field. This patch adds support for this to the simple-card
driver and exposes the feature via three new device-tree properties that
configure the pcm format, the sampling rate and the channel count.
Signed-off-by: Daniel Mack <daniel@xxxxxxxxxx>
---
.../devicetree/bindings/sound/simple-card.txt | 10 ++++++
include/sound/simple_card_utils.h | 6 +++-
sound/soc/generic/simple-card-utils.c | 34 +++++++++++++++++++
sound/soc/generic/simple-card.c | 19 +++++++++++
4 files changed, 68 insertions(+), 1 deletion(-)
diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt b/Documentation/devicetree/bindings/sound/simple-card.txt
index 79954cd6e37b..13f0c0da8b53 100644
--- a/Documentation/devicetree/bindings/sound/simple-card.txt
+++ b/Documentation/devicetree/bindings/sound/simple-card.txt
@@ -27,6 +27,16 @@ Optional properties:
- simple-audio-card,pin-switches : List of strings containing the widget names for
which pin switches must be created.
+Optional dai-link properies for CODEC-to-CODEC links:
+
+- codec-to-codec-format : Format to configure
+ "s16_le"; "s24_le", "s32_le", ...
+- codec-to-codec-rate : Sample rate to configure
+- codec-to-codec-channels : Number of channels to configure
+
+Note that for a CODEC-to-CODEC link to be activated, you also need to provide a
+valid DAPM path that connects the two components.
+
Optional subnodes:
- simple-audio-card,dai-link : Container for dai-link level
diff --git a/include/sound/simple_card_utils.h b/include/sound/simple_card_utils.h
index bbdd1542d6f1..a170f0656c1f 100644
--- a/include/sound/simple_card_utils.h
+++ b/include/sound/simple_card_utils.h
@@ -48,6 +48,7 @@ struct asoc_simple_priv {
struct snd_soc_dai_link_component platforms;
struct asoc_simple_data adata;
struct snd_soc_codec_conf *codec_conf;
+ struct snd_soc_pcm_stream c2c_params;
unsigned int mclk_fs;
} *dai_props;
struct asoc_simple_jack hp_jack;
@@ -121,7 +122,10 @@ void asoc_simple_convert_fixup(struct asoc_simple_data *data,
void asoc_simple_parse_convert(struct device *dev,
struct device_node *np, char *prefix,
struct asoc_simple_data *data);
-
+void asoc_simple_parse_c2c_params(struct device *dev,
+ struct device_node *np,
+ char *prefix,
+ struct snd_soc_pcm_stream *dest);
int asoc_simple_parse_routing(struct snd_soc_card *card,
char *prefix);
int asoc_simple_parse_widgets(struct snd_soc_card *card,
diff --git a/sound/soc/generic/simple-card-utils.c b/sound/soc/generic/simple-card-utils.c
index 9b794775df53..73e09b790040 100644
--- a/sound/soc/generic/simple-card-utils.c
+++ b/sound/soc/generic/simple-card-utils.c
@@ -52,6 +52,40 @@ void asoc_simple_parse_convert(struct device *dev,
}
EXPORT_SYMBOL_GPL(asoc_simple_parse_convert);
+void asoc_simple_parse_c2c_params(struct device *dev,
+ struct device_node *np,
+ char *prefix,
+ struct snd_soc_pcm_stream *dest)
+{
+ unsigned int rate, channels;
+ const char *format_string;
+ snd_pcm_format_t format;
+ char prop[128];
+ int ret;
+
+ if (!prefix)
+ prefix = "";
+
+ snprintf(prop, sizeof(prop), "%s%s", prefix, "codec-to-codec-rate");
+ of_property_read_u32(np, prop, &rate);
+
+ snprintf(prop, sizeof(prop), "%s%s", prefix, "codec-to-codec-channels");
+ of_property_read_u32(np, prop, &channels);
+
+ snprintf(prop, sizeof(prop), "%s%s", prefix, "codec-to-codec-format");
+ if (!of_property_read_string(np, prop, &format_string)) {
+ ret = snd_pcm_format_by_name(format_string, &format);
+ if (ret == 0) {
+ dest->formats = 1ULL << format;
+ dest->channels_min = dest->channels_max = channels;
+ dest->rate_min = dest->rate_max = rate;
+ } else {
+ dev_err(dev, "unknown dai format %s\n", format_string);
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(asoc_simple_parse_c2c_params);
+
int asoc_simple_parse_daifmt(struct device *dev,
struct device_node *node,
struct device_node *codec,
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index cbda6455d9c7..2aab1c9ebc4a 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -94,6 +94,21 @@ static void simple_parse_convert(struct device *dev,
of_node_put(node);
}
+static void simple_parse_c2c_params(struct device *dev,
+ struct device_node *np,
+ struct snd_soc_pcm_stream *dest)
+{
+ struct device_node *top = dev->of_node;
+ struct device_node *node = of_get_parent(np);
+
+ asoc_simple_parse_c2c_params(dev, top, PREFIX, dest);
+ asoc_simple_parse_c2c_params(dev, node, PREFIX, dest);
+ asoc_simple_parse_c2c_params(dev, node, NULL, dest);
+ asoc_simple_parse_c2c_params(dev, np, NULL, dest);
+
+ of_node_put(node);
+}
+
static void simple_parse_mclk_fs(struct device_node *top,
struct device_node *cpu,
struct device_node *codec,
@@ -334,6 +349,10 @@ static int simple_dai_link_of(struct asoc_simple_priv *priv,
dai_link->ops = &simple_ops;
dai_link->init = asoc_simple_dai_init;
+ simple_parse_c2c_params(dev, node, &dai_props->c2c_params);
+ if (dai_props->c2c_params.formats != 0)
+ dai_link->params = &dai_props->c2c_params;
+
asoc_simple_canonicalize_cpu(dai_link, single_cpu);
asoc_simple_canonicalize_platform(dai_link);
--
2.23.0
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