linux-kernel - [PATCH v2 2/3] ASoC: core: add slot information parsing supports

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Date:	Wed, 12 Feb 2014 15:45:11 +0800
From:	Xiubo Li <Li.Xiubo@...escale.com>
To:	<broonie@...nel.org>, <lgirdwood@...il.com>
CC:	<kuninori.morimoto.gx@...esas.com>, <alsa-devel@...a-project.org>,
	<linux-kernel@...r.kernel.org>, <tiwai@...e.de>, <perex@...ex.cz>,
	Xiubo Li <Li.Xiubo@...escale.com>
Subject: [PATCH v2 2/3] ASoC: core: add slot information parsing supports

For some CPU/CODEC DAI devices the slot infomation maybe needed. This
patch adds the slot parsing from DT supports.

The style of the slot information in DT should be:
	<tx_mask, rx_mask, slots, slot_width>

For instance:
	simple-slot-info = <0xffffffc 0xffffffc 2 0>;

Please refer to tdm-slot.txt for more detail.

Signed-off-by: Xiubo Li <Li.Xiubo@...escale.com>
---
 include/sound/soc.h  | 10 ++++++++++
 sound/soc/soc-core.c | 23 +++++++++++++++++++++++
 2 files changed, 33 insertions(+)

diff --git a/include/sound/soc.h b/include/sound/soc.h
index 21d025e..1aa85d0 100644
--- a/include/sound/soc.h
+++ b/include/sound/soc.h
@@ -1110,6 +1110,13 @@ struct soc_enum {
 	const unsigned int *values;
 };
 
+struct soc_slot_info {
+	unsigned int tx_mask;
+	unsigned int rx_mask;
+	int slots;
+	int slot_width;
+};
+
 /* codec IO */
 unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg);
 unsigned int snd_soc_write(struct snd_soc_codec *codec,
@@ -1190,6 +1197,9 @@ int snd_soc_of_parse_card_name(struct snd_soc_card *card,
 			       const char *propname);
 int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
 					  const char *propname);
+int snd_soc_of_parse_slot_info(struct device_node *np,
+			      struct soc_slot_info *info,
+			      const char *propname);
 int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
 				   const char *propname);
 unsigned int snd_soc_of_parse_daifmt(struct device_node *np,
diff --git a/sound/soc/soc-core.c b/sound/soc/soc-core.c
index abee5f4..3ad4b88 100644
--- a/sound/soc/soc-core.c
+++ b/sound/soc/soc-core.c
@@ -4558,6 +4558,29 @@ int snd_soc_of_parse_audio_simple_widgets(struct snd_soc_card *card,
 }
 EXPORT_SYMBOL_GPL(snd_soc_of_parse_audio_simple_widgets);
 
+int snd_soc_of_parse_slot_info(struct device_node *np,
+			       struct soc_slot_info *info,
+			       const char *propname)
+{
+	u32 out_value[4];
+	int ret;
+
+	if (!info)
+		return -EINVAL;
+
+	ret = of_property_read_u32_array(np, propname, out_value, 4);
+	if (ret)
+		return ret;
+
+	info->tx_mask = out_value[0];
+	info->rx_mask = out_value[1];
+	info->slots = out_value[2];
+	info->slot_width = out_value[3];
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(snd_soc_of_parse_slot_info);
+
 int snd_soc_of_parse_audio_routing(struct snd_soc_card *card,
 				   const char *propname)
 {
-- 
1.8.4


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