Move dai-link level properties away from dai subnodes

The properties like format, bitclock-master, frame-master, bitclock-inversion, and frame-inversion should be common to the dais connected with a dai-link. For bitclock-master and frame-master properties to be unambiguous they need to indicate the mastering dai node with a phandle.

Signed-off-by Jyri Sarha <[email protected]>

---
 .../devicetree/bindings/sound/simple-card.txt      |   91 ++++----
 sound/soc/generic/simple-card.c                    |  237 ++++++++++++--------
 2 files changed, 191 insertions(+), 137 deletions(-)

Documentation/devicetree/bindings/sound/simple-card.txt +10 -7

index 131aa2a..3cafa9e 100644
@@ -1,6 +1,6 @@
 Simple-Card:
 
-Simple-Card specifies audio DAI connection of SoC <-> codec.
+Simple-Card specifies audio DAI connections of SoC <-> codec.
 
 Required properties:
 

@@ -8,28 +8,54 @@ Required properties:
 
 Optional properties:
 
-- simple-audio-card,name		: User specified audio sound card name, one string
+- simple-audio-card,name		: User specified audio sound card name,
+one string
 					  property.
-- 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,widgets		: Please refer to widgets.txt.
 - 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.
-- dai-tdm-slot-num			: Please refer to tdm-slot.txt.
-- dai-tdm-slot-width			: Please refer to tdm-slot.txt.
+Optional subnodes:
+
+- simple-audio-card,dai-link		: Container for dai-link level
+					  properties and the CPU and CODEC
+					  sub-nodes. This container may be
+					  omitted when the card has only one
+					  DAI link. See the examples and the

Documentation/devicetree/bindings/sound/simple-card.txt +15 -6

-- simple-audio-card,dai-link		: container for the CPU and CODEC sub-nodes
-					  This container may be omitted when the
-					  card has only one DAI link.
-					  See the examples.
+- cpu					: CPU   sub-node
+- codec					: CODEC sub-node
 
-- simple-audio-card,cpu			: CPU   sub-node
-- simple-audio-card,codec		: CODEC sub-node
+Optional dai-link subnode properties:
+
+- format				: CPU/CODEC common audio format.
+					  "i2s", "right_j", "left_j" , "dsp_a"
+					  "dsp_b", "ac97", "pdm", "msb", "lsb"
+- frame-master				: Indicates dai-link frame master.
+					  phandle to a cpu or codec subnode.
+- bitclock-master			: Indicates dai-link bit clock master.
+					  phandle to a cpu or codec subnode.
+- bitclock-inversion			: bool property. Add this if the
+					  dai-link uses bit clock inversion.
+- frame-inversion			: bool property. Add this if the
+					  dai-link uses frame clock inversion.

sound/soc/generic/simple-card.c +59 -33

 #include <linux/clk.h>
 #include <linux/device.h>
 #include <linux/module.h>

@@ -88,7 +89,6 @@ static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
 
 static int
 asoc_simple_card_sub_parse_of(struct device_node *np,
-			      unsigned int daifmt,
 			      struct asoc_simple_dai *dai,
 			      const struct device_node **p_node,
 			      const char **name)

@@ -117,14 +117,6 @@ asoc_simple_card_sub_parse_of(struct device_node *np,
 		return ret;
 
 	/*
-	 * bitclock-inversion, frame-inversion
-	 * bitclock-master,    frame-master
-	 * and specific "format" if it has
-	 */
-	dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
-	dai->fmt |= daifmt;
-
-	/*
 	 * dai->sysclk come from
 	 *  "clocks = <&xxx>" (if system has common clock)
 	 *  or "system-clock-frequency = <xxx>"

@@ -151,37 +143,134 @@ asoc_simple_card_sub_parse_of(struct device_node *np,
 	return 0;
 }
 
-static int simple_card_cpu_codec_of(struct device_node *node,
-				int daifmt,
-				struct snd_soc_dai_link *dai_link,
-				struct simple_dai_props *dai_props)
+static int simple_card_dai_link_of(struct device_node *node,
+				   struct device *dev,
+				   struct snd_soc_dai_link *dai_link,
+				   struct simple_dai_props *dai_props)
 {
-	struct device_node *np;
+	struct device_node *np = NULL;
+	struct device_node *bitclkmaster = NULL;
+	struct device_node *framemaster = NULL;
+	unsigned int daifmt;
+	char *name;
+	char prop[128];
+	char *prefix = "";
 	int ret;
 
-	/* CPU sub-node */
-	ret = -EINVAL;
-	np = of_get_child_by_name(node, "simple-audio-card,cpu");
-	if (np) {
-		ret = asoc_simple_card_sub_parse_of(np, daifmt,
-						&dai_props->cpu_dai,
-						&dai_link->cpu_of_node,
-						&dai_link->cpu_dai_name);
-		of_node_put(np);
+	if (!strcmp("sound", node->name))
+		prefix = "simple-audio-card,";
+
+	daifmt = snd_soc_of_parse_daifmt(node, prefix,
+					 &bitclkmaster, &framemaster);
+	daifmt &= ~SND_SOC_DAIFMT_MASTER_MASK;
+
+	snprintf(prop, sizeof(prop), "%scpu", prefix);
+	np = of_get_child_by_name(node, prop);
+	if (!np) {
+		ret = -EINVAL;
+		dev_err(dev, "%s: Can't find simple-audio-card,cpu DT node\n",
+			__func__);
+		goto dai_link_of_err;
 	}
+
+	ret = asoc_simple_card_sub_parse_of(np, &dai_props->cpu_dai,
+					    &dai_link->cpu_of_node,
+					    &dai_link->cpu_dai_name);
 	if (ret < 0)
-		return ret;
+		goto dai_link_of_err;
+
+	dai_props->cpu_dai.fmt = daifmt;
+	switch (((np == bitclkmaster)<<4)|(np == framemaster)) {
+	case 0x11:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBS_CFS;
+		break;
+	case 0x10:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBS_CFM;
+		break;
+	case 0x01:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBM_CFS;
+		break;
+	default:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBM_CFM;
+		break;
+	}
 
-	/* CODEC sub-node */
-	ret = -EINVAL;
-	np = of_get_child_by_name(node, "simple-audio-card,codec");
-	if (np) {
-		ret = asoc_simple_card_sub_parse_of(np, daifmt,
-						&dai_props->codec_dai,
-						&dai_link->codec_of_node,
-						&dai_link->codec_dai_name);
-		of_node_put(np);
+	of_node_put(np);
+	snprintf(prop, sizeof(prop), "%scodec", prefix);
+	np = of_get_child_by_name(node, prop);
+	if (!np) {
+		ret = -EINVAL;
+		dev_err(dev, "%s: Can't find simple-audio-card,codec DT node\n",
+			__func__);
+		goto dai_link_of_err;
 	}
+
+	ret = asoc_simple_card_sub_parse_of(np, &dai_props->codec_dai,
+					    &dai_link->codec_of_node,
+					    &dai_link->codec_dai_name);
+	if (ret < 0)

sound/soc/generic/simple-card.c +54 -26

+	} else {
+		dai_props->codec_dai.fmt = daifmt;
+		switch (((np == bitclkmaster)<<4)|(np == framemaster)) {
+		case 0x11:
+			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBM_CFM;
+			break;
+		case 0x10:
+			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBM_CFS;
+			break;
+		case 0x01:
+			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBS_CFM;
+			break;
+		default:
+			dai_props->codec_dai.fmt |= SND_SOC_DAIFMT_CBS_CFS;
+			break;
+		}
+	}
+
+	if (!dai_link->cpu_dai_name || !dai_link->codec_dai_name) {
+			ret = -EINVAL;
+			goto dai_link_of_err;
+	}
+
+	/* simple-card assumes platform == cpu */
+	dai_link->platform_of_node = dai_link->cpu_of_node;
+
+	/* Link name is created from CPU/CODEC dai name */
+	name = devm_kzalloc(dev,
+			    strlen(dai_link->cpu_dai_name)   +
+			    strlen(dai_link->codec_dai_name) + 2,
+			    GFP_KERNEL);
+	sprintf(name, "%s-%s", dai_link->cpu_dai_name,
+				dai_link->codec_dai_name);
+	dai_link->name = dai_link->stream_name = name;
+
+	dev_dbg(dev, "\tname : %s\n", dai_link->stream_name);
+	dev_dbg(dev, "\tcpu : %s / %04x / %d\n",
+		dai_link->cpu_dai_name,
+		dai_props->cpu_dai.fmt,
+		dai_props->cpu_dai.sysclk);
+	dev_dbg(dev, "\tcodec : %s / %04x / %d\n",
+		dai_link->codec_dai_name,
+		dai_props->codec_dai.fmt,
+		dai_props->codec_dai.sysclk);
+
+dai_link_of_err:
+	if (np)
+		of_node_put(np);
+	if (bitclkmaster)
+		of_node_put(bitclkmaster);
+	if (framemaster)
+		of_node_put(framemaster);
 	return ret;
 }
 

@@ -192,18 +281,11 @@ static int asoc_simple_card_parse_of(struct device_node *node,
 {
 	struct snd_soc_dai_link *dai_link = priv->snd_card.dai_link;
 	struct simple_dai_props *dai_props = priv->dai_props;
-	struct device_node *np;
-	char *name;
-	unsigned int daifmt;
 	int ret;
 
 	/* parsing the card name from DT */
 	snd_soc_of_parse_card_name(&priv->snd_card, "simple-audio-card,name");
 
-	/* get CPU/CODEC common format via simple-audio-card,format */
-	daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
-		(SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
-
 	/* off-codec widgets */
 	if (of_property_read_bool(node, "simple-audio-card,widgets")) {
 		ret = snd_soc_of_parse_audio_simple_widgets(&priv->snd_card,

@@ -220,71 +302,30 @@ static int asoc_simple_card_parse_of(struct device_node *node,
 			return ret;
 	}
 
-	/* loop on the DAI links */
-	np = NULL;
-	for (;;) {
-		if (multi) {
-			np = of_get_next_child(node, np);
-			if (!np)
-				break;
-		}
-
-		ret = simple_card_cpu_codec_of(multi ? np : node,
-					daifmt, dai_link, dai_props);
-		if (ret < 0)
-			goto err;
-
-		/*
-		 * overwrite cpu_dai->fmt as its DAIFMT_MASTER bit is based on CODEC
-		 * while the other bits should be identical unless buggy SW/HW design.
-		 */
-		dai_props->cpu_dai.fmt = dai_props->codec_dai.fmt;
+	dev_dbg(dev, "New simple-card: %s\n", priv->snd_card.name ?
+		priv->snd_card.name : "");
 

sound/soc/generic/simple-card.c +5 -36

 		}
-
-		/* simple-card assumes platform == cpu */
-		dai_link->platform_of_node = dai_link->cpu_of_node;
-
-		name = devm_kzalloc(dev,
-				    strlen(dai_link->cpu_dai_name)   +
-				    strlen(dai_link->codec_dai_name) + 2,
-				    GFP_KERNEL);
-		sprintf(name, "%s-%s", dai_link->cpu_dai_name,
-					dai_link->codec_dai_name);
-		dai_link->name = dai_link->stream_name = name;
-
-		if (!multi)
-			break;
-
-		dai_link++;
-		dai_props++;
+	} else {
+		ret = simple_card_dai_link_of(node, dev, dai_link, dai_props);
+		if (ret < 0)
+			return ret;
 	}
 
-	/* card name is created from CPU/CODEC dai name */
-	dai_link = priv->snd_card.dai_link;
 	if (!priv->snd_card.name)
-		priv->snd_card.name = dai_link->name;
-
-	dev_dbg(dev, "card-name : %s\n", priv->snd_card.name);
-	dev_dbg(dev, "platform : %04x\n", daifmt);
-	dai_props = priv->dai_props;
-	dev_dbg(dev, "cpu : %s / %04x / %d\n",
-		dai_link->cpu_dai_name,
-		dai_props->cpu_dai.fmt,
-		dai_props->cpu_dai.sysclk);
-	dev_dbg(dev, "codec : %s / %04x / %d\n",
-		dai_link->codec_dai_name,
-		dai_props->codec_dai.fmt,
-		dai_props->codec_dai.sysclk);
+		priv->snd_card.name = priv->snd_card.dai_link->name;
 
 	return 0;
-
-err:
-	of_node_put(np);
-	return ret;
 }
 
 /* update the reference count of the devices nodes at end of probe */

Quoted 8 lines · On Fri, 21 Mar 2014 18:47:23 +0200 Jyri Sarha <[email protected]> wrote:

The properties like format, bitclock-master, frame-master, bitclock-inversion, and frame-inversion should be common to the dais connected with a dai-link. For bitclock-master and frame-master properties to be unambiguous they need to indicate the mastering dai node with a phandle.

Signed-off-by Jyri Sarha <[email protected]>

---

Documentation/devicetree/bindings/sound/simple-card.txt Required properties: · line 34

Quoted 2 lines

Documentation/devicetree/bindings/sound/simple-card.txt +1 -1

-Required subnodes:
+Requred dai-link subnodes:

Typo: 'Required'

sound/soc/generic/simple-card.c line 11

Quoted 7 lines

sound/soc/generic/simple-card.c +1 -0

@@ -8,6 +8,7 @@
   * it under the terms of the GNU General Public License version 2 as
   * published by the Free Software Foundation.
   */
+#define DEBUG

Should be removed.

Quoted 4 lines

sound/soc/generic/simple-card.c +4 -0

+	if (!bitclkmaster && !framemaster) {
+		/* Master setting not found from dai_link level, revert back
+		   to legacy DT parsing and take settings from codec node. */
+		dev_dbg(dev, "%s: Revert to legacy daifmt parsing\n",

sound/soc/generic/simple-card.c asoc_simple_card_sub_parse_of(struct device_node *np, · line 221

Quoted 4 lines

sound/soc/generic/simple-card.c +4 -0

+			__func__);
+		dai_props->cpu_dai.fmt = dai_props->codec_dai.fmt =
+			snd_soc_of_parse_daifmt(np, NULL, NULL, NULL) |
+			(daifmt & ~SND_SOC_DAIFMT_CLOCK_MASK);

We are here each time there is no bitclock-master and no frame-master, i.e. each time for me. It could be simpler to keep the first 'daifmt' instead of parsing again.

sound/soc/generic/simple-card.c static int asoc_simple_card_parse_of(struct device_node *node, · line 314

Quoted 7 lines

sound/soc/generic/simple-card.c +7 -0

+	if (multi) {
+		struct device_node *np = NULL;
+		int i;
+		for (i = 0; (np = of_get_next_child(node, np)); i++) {
+			dev_dbg(dev, "\tlink %d:\n", i);
+			ret = simple_card_dai_link_of(np, dev, dai_link + i,
+						      dai_props + i);

I feel that my loop was quicker:

		struct device_node *np = NULL;

		for (;;) {
			np = of_get_next_child(node, np);
			if (!np)
				break;
			dev_dbg(dev, "\tlink %d:\n", dai_link - priv->snd_card.dai_link);
			ret = simple_card_dai_link_of(np, dev, dai_link++,
						      dai_props++);

sound/soc/generic/simple-card.c static int asoc_simple_card_parse_of(struct device_node *node, · line 317

Quoted 3 lines

sound/soc/generic/simple-card.c +3 -0

+			of_node_put(np);
+			if (ret < 0)
+				return ret;

The np reference count is updated in of_get_next_child(), so:

			if (ret < 0) {
				of_node_put(np);
				return ret;
			}

Otherwise, it works for me.

Tested-by Jean-Francois Moine <[email protected]>

The properties like format, bitclock-master, frame-master, bitclock-inversion, and frame-inversion should be common to the dais connected with a dai-link. For bitclock-master and frame-master properties to be unambiguous they need to indicate the mastering dai node with a phandle.

Signed-off-by Jyri Sarha <[email protected]>

---

sound/soc/generic/simple-card.c +5 -0

+	dai_props->cpu_dai.fmt = daifmt;
+	switch (((np == bitclkmaster)<<4)|(np == framemaster)) {
+	case 0x11:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBS_CFS;
+		break;

Hi Jyri

Quoted 8 lines

The properties like format, bitclock-master, frame-master, bitclock-inversion, and frame-inversion should be common to the dais connected with a dai-link. For bitclock-master and frame-master properties to be unambiguous they need to indicate the mastering dai node with a phandle.

Signed-off-by Jyri Sarha <[email protected]>

---

(snip)

sound/soc/generic/simple-card.c asoc_simple_card_sub_parse_of(struct device_node *np, · line 122

Quoted 12 lines

/*

sound/soc/generic/simple-card.c +0 -8

-	 * bitclock-inversion, frame-inversion
-	 * bitclock-master,    frame-master
-	 * and specific "format" if it has
-	 */
-	dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
-	dai->fmt |= daifmt;
-
-	/*
  	 * dai->sysclk come from
  	 *  "clocks = <&xxx>" (if system has common clock)
  	 *  or "system-clock-frequency = <xxx>"

[1/2] patch exchanged snd_soc_of_parse_daifmt() parameter, but, user code exchanged in [2/2].
It breaks git-bisect.

Quoted 11 lines

sound/soc/generic/simple-card.c +11 -0

+	dai_props->cpu_dai.fmt = daifmt;
+	switch (((np == bitclkmaster)<<4)|(np == framemaster)) {
+	case 0x11:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBS_CFS;
+		break;
+	case 0x10:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBS_CFM;
+		break;
+	case 0x01:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBM_CFS;
+		break;

sound/soc/generic/simple-card.c asoc_simple_card_sub_parse_of(struct device_node *np, · line 196

Quoted 4 lines

sound/soc/generic/simple-card.c +4 -0

+	default:
+		dai_props->cpu_dai.fmt |= SND_SOC_DAIFMT_CBM_CFM;
+		break;
+	}

The user of snd_soc_of_parse_daifmt() is only simple-card (?) I think SND_SOC_DAIFMT_CBxx_CFx cared by snd_soc_of_parse_daifmt() somehow is very reasonable.