[alsa-devel] [PATCH v2 1/3] ASoC: rockchip: Parse dai links from dts

[Jeffy Chen]

Refactor rockchip_sound_probe, parse dai links from dts instead of
hard coding them.

Signed-off-by: Jeffy Chen <jeffy.chen at rock-chips.com>
---

Changes in v2:
Let rockchip,codec-names be a required property, because we plan to
add more supported codecs to the fixed dai link list in the driver.

 sound/soc/rockchip/rk3399_gru_sound.c | 125 ++++++++++++++++++++++------------
 1 file changed, 81 insertions(+), 44 deletions(-)

diff --git a/sound/soc/rockchip/rk3399_gru_sound.c b/sound/soc/rockchip/rk3399_gru_sound.c
index 3475c61..03b7fae 100644
--- a/sound/soc/rockchip/rk3399_gru_sound.c
+++ b/sound/soc/rockchip/rk3399_gru_sound.c
@@ -247,9 +247,7 @@ enum {
 	DAILINK_RT5514_DSP,
 };
 
-#define DAILINK_ENTITIES	(DAILINK_DA7219 + 1)
-
-static struct snd_soc_dai_link rockchip_dailinks[] = {
+static const struct snd_soc_dai_link rockchip_dais[] = {
 	[DAILINK_MAX98357A] = {
 		.name = "MAX98357A",
 		.stream_name = "MAX98357A PCM",
@@ -290,8 +288,6 @@ static struct snd_soc_dai_link rockchip_dailinks[] = {
 static struct snd_soc_card rockchip_sound_card = {
 	.name = "rk3399-gru-sound",
 	.owner = THIS_MODULE,
-	.dai_link = rockchip_dailinks,
-	.num_links =  ARRAY_SIZE(rockchip_dailinks),
 	.dapm_widgets = rockchip_dapm_widgets,
 	.num_dapm_widgets = ARRAY_SIZE(rockchip_dapm_widgets),
 	.dapm_routes = rockchip_dapm_routes,
@@ -305,71 +301,112 @@ static int rockchip_sound_match_stub(struct device *dev, void *data)
 	return 1;
 }
 
-static int rockchip_sound_probe(struct platform_device *pdev)
+static int rockchip_sound_of_parse_dais(struct device *dev,
+					struct snd_soc_card *card)
 {
-	struct snd_soc_card *card = &rockchip_sound_card;
+	struct device *rt5514_dev;
+	struct device_driver *rt5514_drv;
 	struct device_node *cpu_node;
-	struct device *dev;
-	struct device_driver *drv;
-	int i, ret;
-
-	cpu_node = of_parse_phandle(pdev->dev.of_node, "rockchip,cpu", 0);
-	if (!cpu_node) {
-		dev_err(&pdev->dev, "Property 'rockchip,cpu' missing or invalid\n");
-		return -EINVAL;
-	}
-
-	for (i = 0; i < DAILINK_ENTITIES; i++) {
-		rockchip_dailinks[i].platform_of_node = cpu_node;
-		rockchip_dailinks[i].cpu_of_node = cpu_node;
+	struct device_node *np_codec;
+	struct snd_soc_dai_link *dai;
+	bool has_rt5514 = false;
+	int i, index, ret;
+
+	card->dai_link = devm_kzalloc(dev, sizeof(rockchip_dais),
+				      GFP_KERNEL);
+	if (!card->dai_link)
+		return -ENOMEM;
+
+	cpu_node = of_parse_phandle(dev->of_node, "rockchip,cpu", 0);
+
+	card->num_links = 0;
+	for (i = 0; i < DAILINK_RT5514_DSP; i++) {
+		index = of_property_match_string(dev->of_node,
+				"rockchip,codec-names",
+				rockchip_dais[i].name);
+		if (index < 0)
+			continue;
+
+		np_codec = of_parse_phandle(dev->of_node,
+					    "rockchip,codec", index);
+		if (!np_codec) {
+			dev_err(dev, "Missing 'rockchip,codec' for %s\n",
+				rockchip_dais[i].name);
+			return -EINVAL;
+		}
+		if (!of_device_is_available(np_codec))
+			continue;
 
-		rockchip_dailinks[i].codec_of_node =
-			of_parse_phandle(pdev->dev.of_node, "rockchip,codec", i);
-		if (!rockchip_dailinks[i].codec_of_node) {
-			dev_err(&pdev->dev,
-				"Property[%d] 'rockchip,codec' missing or invalid\n", i);
+		if (!cpu_node) {
+			dev_err(dev, "Missing 'rockchip,cpu' for %s\n",
+				rockchip_dais[i].name);
 			return -EINVAL;
 		}
+
+		dai = &card->dai_link[card->num_links++];
+		*dai = rockchip_dais[i];
+
+		dai->codec_of_node = np_codec;
+		dai->platform_of_node = cpu_node;
+		dai->cpu_of_node = cpu_node;
+
+		if (i == DAILINK_RT5514)
+			has_rt5514 = true;
 	}
 
+	if (!has_rt5514)
+		return 0;
+
 	/**
 	 * To acquire the spi driver of the rt5514 and set the dai-links names
 	 * for soc_bind_dai_link
 	 */
-	drv = driver_find("rt5514", &spi_bus_type);
-	if (!drv) {
-		dev_err(&pdev->dev, "Can not find the rt5514 driver at the spi bus\n");
+	rt5514_drv = driver_find("rt5514", &spi_bus_type);
+	if (!rt5514_drv) {
+		dev_err(dev, "Can not find the rt5514 driver at the spi bus\n");
 		return -EINVAL;
 	}
 
-	dev = driver_find_device(drv, NULL, NULL, rockchip_sound_match_stub);
-	if (!dev) {
-		dev_err(&pdev->dev, "Can not find the rt5514 device\n");
+	rt5514_dev = driver_find_device(rt5514_drv, NULL, NULL,
+					rockchip_sound_match_stub);
+	if (!rt5514_dev) {
+		dev_err(dev, "Can not find the rt5514 device\n");
 		return -ENODEV;
 	}
 
 	/* Set DMIC delay */
-	ret = device_property_read_u32(&pdev->dev, "dmic-delay",
-					&rt5514_dmic_delay);
-	if (ret) {
+	ret = device_property_read_u32(dev, "dmic-delay", &rt5514_dmic_delay);
+	if (ret < 0) {
 		rt5514_dmic_delay = 0;
-		dev_dbg(&pdev->dev,
+		dev_dbg(dev,
 			"no optional property 'dmic-delay' found, default: no delay\n");
 	}
 
-	rockchip_dailinks[DAILINK_RT5514_DSP].cpu_name = kstrdup_const(dev_name(dev), GFP_KERNEL);
-	rockchip_dailinks[DAILINK_RT5514_DSP].cpu_dai_name = kstrdup_const(dev_name(dev), GFP_KERNEL);
-	rockchip_dailinks[DAILINK_RT5514_DSP].platform_name = kstrdup_const(dev_name(dev), GFP_KERNEL);
+	dai = &card->dai_link[card->num_links++];
+	*dai = rockchip_dais[DAILINK_RT5514_DSP];
+
+	dai->cpu_name = devm_kstrdup(dev, dev_name(rt5514_dev), GFP_KERNEL);
+	dai->cpu_dai_name = dai->cpu_name;
+	dai->platform_name = dai->cpu_name;
+
+	return 0;
+}
+
+static int rockchip_sound_probe(struct platform_device *pdev)
+{
+	struct snd_soc_card *card = &rockchip_sound_card;
+	int ret;
+
+	ret = rockchip_sound_of_parse_dais(&pdev->dev, card);
+	if (ret < 0) {
+		dev_err(&pdev->dev, "Failed to parse dais: %d\n", ret);
+		return ret;
+	}
 
 	card->dev = &pdev->dev;
 	platform_set_drvdata(pdev, card);
 
-	ret = devm_snd_soc_register_card(&pdev->dev, card);
-	if (ret)
-		dev_err(&pdev->dev, "%s snd_soc_register_card fail %d\n",
-			__func__, ret);
-
-	return ret;
+	return devm_snd_soc_register_card(&pdev->dev, card);
 }
 
 static const struct of_device_id rockchip_sound_of_match[] = {
-- 
2.1.4