[alsa-devel] [RFC][PATCH 2/2 v3] ASoC: simple-card: add Device Tree support

Kuninori Morimoto kuninori.morimoto.gx at renesas.com
Wed Jan 30 10:09:22 CET 2013


Support for loading the simple-card module via devicetree.
It requests cpu/codec information for probing.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx at renesas.com>
---
v2 -> v3

 - modify simple-card.txt
 - remove "platform" from DT
 - DT used sub-node

 .../devicetree/bindings/sound/simple-card.txt      |   71 +++++++++++++
 sound/soc/generic/simple-card.c                    |  105 +++++++++++++++++++-
 2 files changed, 171 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/sound/simple-card.txt

diff --git a/Documentation/devicetree/bindings/sound/simple-card.txt b/Documentation/devicetree/bindings/sound/simple-card.txt
new file mode 100644
index 0000000..0d8627d
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/simple-card.txt
@@ -0,0 +1,71 @@
+Simple-Card:
+
+Required properties:
+
+- compatible			: "simple-audio"
+- simple-audio,card-name	: simple-audio card name
+- simple-audio,format		: see below
+
+Optional properties:
+
+- simple-audio,bitclock-inversion
+- simple-audio,frame-inversion
+
+CPU / CODEC DAI is represented as a sub-node.
+Then, sub-node name should be "simple-audio,cpu" or "simple-audio,codec".
+
+Required subnode properties:
+- simple-audio,dev		: phandle for CPU/CODEC
+
+Optional subnode properties:
+
+- simple-audio,dai-name			: simple-audio CPU/CODEC DAI name
+- simple-audio,system-clock-frequency	: system clock rate
+- simple-audio,frame-master
+- simple-audio,bitclock-master
+
+simple-audio,format
+	"i2s"
+	"right_j"
+	"left_j"
+	"dsp_a"
+	"dsp_b"
+	"ac97"
+	"pdm"
+	"msb"
+	"lsb"
+
+Example:
+
+sound {
+	compatible = "simple-audio";
+
+	simple-audio,card-name = "FSI2A-AK4648";
+	simple-audio,format = "left_j";
+
+	simple-audio,cpu {
+		simple-audio,dev = <&sh_fsi2>;
+	};
+
+	simple-audio,codec {
+		simple-audio,dev = <&ak4648>;
+		simple-audio,dai-name = "ak4642-hifi";
+		simple-audio,bitclock-master;
+		simple-audio,frame-master;
+		simple-audio,system-clock-frequency = <11289600>;
+	};
+};
+
+&i2c0 {
+	ak4648: ak4648 at 0x12 {
+		compatible = "asahi-kasei,ak4648";
+		reg = <0x12>;
+	};
+};
+
+sh_fsi2: sh_fsi2 at 0xec230000 {
+	compatible = "renesas,sh_fsi2";
+	reg = <0xec230000 0x400>;
+	interrupt-parent = <&gic>;
+	interrupts = <0 146 0x4>;
+};
diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index 6cf8355..21ad779 100644
--- a/sound/soc/generic/simple-card.c
+++ b/sound/soc/generic/simple-card.c
@@ -9,6 +9,7 @@
  * published by the Free Software Foundation.
  */
 
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/module.h>
 #include <sound/simple_card.h>
@@ -52,11 +53,95 @@ static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
 	return 0;
 }
 
+static struct device_node*
+__asoc_simple_card_parse_of(struct device_node *np,
+			    struct asoc_simple_dai *dai)
+{
+	struct device_node *node;
+
+	/* get "simple-audio,dev = <xxx>" */
+	node = of_parse_phandle(np, "simple-audio,dev", 0);
+	if (node)
+		of_node_put(node);
+
+	/* get "simple-audio,dai-name = xxx" */
+	of_property_read_string(np, "simple-audio,dai-name", &dai->name);
+
+	/* get dai specific format */
+	dai->fmt = snd_soc_of_parse_daifmt(np, "simple-audio,");
+
+	/* get "simple-audio,system-clock-frequency = <xxx>" */
+	of_property_read_u32(np, "simple-audio,system-clock-frequency",
+			     &dai->sysclk);
+
+	return node;
+}
+
+static void asoc_simple_card_parse_of(struct device_node *node,
+				      struct asoc_simple_card_info *info,
+				      struct device *dev,
+				      struct device_node **of_cpu,
+				      struct device_node **of_codec,
+				      struct device_node **of_platform)
+{
+	struct device_node *np;
+
+	of_property_read_string(node, "simple-audio,card-name", &info->card);
+	info->name = info->card;
+
+	info->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio,") &
+		(SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
+
+	for_each_child_of_node(node, np) {
+		if (0 == strcmp("simple-audio,cpu", np->name))
+			*of_cpu = __asoc_simple_card_parse_of(
+						np, &info->cpu_dai);
+		if (0 == strcmp("simple-audio,codec", np->name))
+			*of_codec = __asoc_simple_card_parse_of(
+						np, &info->codec_dai);
+	}
+
+	/* simple-card assumes platform == cpu */
+	*of_platform = *of_cpu;
+
+	dev_dbg(dev, "card-name : %s\n", info->card);
+	dev_dbg(dev, "platform : %04x / %p\n",
+		info->daifmt,
+		*of_platform);
+	dev_dbg(dev, "cpu : %s / %04x / %d / %p\n",
+		info->cpu_dai.name,
+		info->cpu_dai.fmt,
+		info->cpu_dai.sysclk,
+		*of_cpu);
+	dev_dbg(dev, "codec : %s / %04x / %d / %p\n",
+		info->codec_dai.name,
+		info->codec_dai.fmt,
+		info->codec_dai.sysclk,
+		*of_codec);
+}
+
 static int asoc_simple_card_probe(struct platform_device *pdev)
 {
-	struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;
+	struct asoc_simple_card_info *cinfo;
+	struct device_node *np = pdev->dev.of_node;
+	struct device_node *of_cpu, *of_codec, *of_platform;
 	struct device *dev = &pdev->dev;
 
+	cinfo		= NULL;
+	of_cpu		= NULL;
+	of_codec	= NULL;
+	of_platform	= NULL;
+	if (np && of_device_is_available(np)) {
+		cinfo = devm_kzalloc(dev, sizeof(*cinfo), GFP_KERNEL);
+		if (cinfo)
+			asoc_simple_card_parse_of(np, cinfo, dev,
+						  &of_cpu,
+						  &of_codec,
+						  &of_platform);
+	} else {
+		cinfo = pdev->dev.platform_data;
+	}
+
 	if (!cinfo) {
 		dev_err(dev, "no info for asoc-simple-card\n");
 		return -EINVAL;
@@ -64,10 +149,10 @@ static int asoc_simple_card_probe(struct platform_device *pdev)
 
 	if (!cinfo->name	||
 	    !cinfo->card	||
-	    !cinfo->codec	||
-	    !cinfo->platform	||
-	    !cinfo->cpu_dai.name ||
-	    !cinfo->codec_dai.name) {
+	    !cinfo->codec_dai.name	||
+	    !(cinfo->codec		|| of_codec)	||
+	    !(cinfo->platform		|| of_platform)	||
+	    !(cinfo->cpu_dai.name	|| of_cpu)) {
 		dev_err(dev, "insufficient asoc_simple_card_info settings\n");
 		return -EINVAL;
 	}
@@ -81,6 +166,9 @@ static int asoc_simple_card_probe(struct platform_device *pdev)
 	cinfo->snd_link.platform_name	= cinfo->platform;
 	cinfo->snd_link.codec_name	= cinfo->codec;
 	cinfo->snd_link.codec_dai_name	= cinfo->codec_dai.name;
+	cinfo->snd_link.cpu_of_node	= of_cpu;
+	cinfo->snd_link.codec_of_node	= of_codec;
+	cinfo->snd_link.platform_of_node = of_platform;
 	cinfo->snd_link.init		= asoc_simple_card_dai_init;
 
 	/*
@@ -102,9 +190,16 @@ static int asoc_simple_card_remove(struct platform_device *pdev)
 	return snd_soc_unregister_card(&cinfo->snd_card);
 }
 
+static const struct of_device_id asoc_simple_of_match[] = {
+	{ .compatible = "simple-audio", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
+
 static struct platform_driver asoc_simple_card = {
 	.driver = {
 		.name	= "asoc-simple-card",
+		.of_match_table = asoc_simple_of_match,
 	},
 	.probe		= asoc_simple_card_probe,
 	.remove		= asoc_simple_card_remove,
-- 
1.7.9.5



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