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ASoC: simple-card: add Device Tree support 

Support for loading the simple-card module via DeviceTree.
It requests CPU/CODEC information.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Kuninori Morimoto 2013-11-20 15:25:02 +09:00 committed by Mark Brown
parent af91706d5d
commit fa558c2801
2 changed files with 218 additions and 6 deletions
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68
Documentation/devicetree/bindings/sound/simple-card.txt Normal file
View File

@ -0,0 +1,68 @@
Simple-Card:
Simple-Card specifies audio DAI connection of SoC <-> codec.
Required properties:
- compatible : "simple-audio-card"
Optional properties:
- simple-audio-card,format : CPU/CODEC common audio format.
"i2s", "right_j", "left_j" , "dsp_a"
"dsp_b", "ac97", "pdm", "msb", "lsb"
Required subnodes:
- simple-audio-card,cpu : CPU sub-node
- simple-audio-card,codec : CODEC sub-node
Required CPU/CODEC subnodes properties:
- sound-dai : phandle and port of CPU/CODEC
Optional CPU/CODEC subnodes properties:
- format : CPU/CODEC specific audio format if needed.
see simple-audio-card,format
- frame-master : bool property. add this if subnode is frame master
- bitclock-master : bool property. add this if subnode is bitclock master
- bitclock-inversion : bool property. add this if subnode has clock inversion
- frame-inversion : bool property. add this if subnode has frame inversion
- clocks / system-clock-frequency : specify subnode's clock if needed.
it can be specified via "clocks" if system has
clock node (= common clock), or "system-clock-frequency"
(if system doens't support common clock)
Example:
sound {
compatible = "simple-audio-card";
simple-audio-card,format = "left_j";
simple-audio-card,cpu {
sound-dai = <&sh_fsi2 0>;
};
simple-audio-card,codec {
sound-dai = <&ak4648>;
bitclock-master;
frame-master;
clocks = <&osc>;
};
};
&i2c0 {
ak4648: ak4648@12 {
#sound-dai-cells = <0>;
compatible = "asahi-kasei,ak4648";
reg = <0x12>;
};
};
sh_fsi2: sh_fsi2@ec230000 {
#sound-dai-cells = <1>;
compatible = "renesas,sh_fsi2";
reg = <0xec230000 0x400>;
interrupt-parent = <&gic>;
interrupts = <0 146 0x4>;
};

156
sound/soc/generic/simple-card.c
View File

@ -8,7 +8,8 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/module.h>
#include <sound/simple_card.h>
@ -57,11 +58,144 @@ static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
return 0;
}
static int
asoc_simple_card_sub_parse_of(struct device_node *np,
struct asoc_simple_dai *dai,
struct device_node **node)
{
struct clk *clk;
int ret;
/*
* get node via "sound-dai = <&phandle port>"
* it will be used as xxx_of_node on soc_bind_dai_link()
*/
*node = of_parse_phandle(np, "sound-dai", 0);
if (!*node)
return -ENODEV;
/* get dai->name */
ret = snd_soc_of_get_dai_name(np, &dai->name);
if (ret < 0)
goto parse_error;
/*
* bitclock-inversion, frame-inversion
* bitclock-master, frame-master
* and specific "format" if it has
*/
dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
/*
* dai->sysclk come from
* "clocks = <&xxx>" (if system has common clock)
* or "system-clock-frequency = <xxx>"
*/
clk = of_clk_get(np, 0);
if (IS_ERR(clk))
of_property_read_u32(np,
"system-clock-frequency",
&dai->sysclk);
else
dai->sysclk = clk_get_rate(clk);
ret = 0;
parse_error:
of_node_put(*node);
return ret;
}
static int 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;
char *name;
int ret = 0;
/* get CPU/CODEC common format via simple-audio-card,format */
info->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
(SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
/* 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,
&info->cpu_dai,
of_cpu);
if (ret < 0)
return ret;
/* 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,
&info->codec_dai,
of_codec);
if (ret < 0)
return ret;
/* card name is created from CPU/CODEC dai name */
name = devm_kzalloc(dev,
strlen(info->cpu_dai.name) +
strlen(info->codec_dai.name) + 2,
GFP_KERNEL);
sprintf(name, "%s-%s", info->cpu_dai.name, info->codec_dai.name);
info->name = info->card = name;
/* simple-card assumes platform == cpu */
*of_platform = *of_cpu;
dev_dbg(dev, "card-name : %s\n", info->card);
dev_dbg(dev, "platform : %04x\n", info->daifmt);
dev_dbg(dev, "cpu : %s / %04x / %d\n",
info->cpu_dai.name,
info->cpu_dai.fmt,
info->cpu_dai.sysclk);
dev_dbg(dev, "codec : %s / %04x / %d\n",
info->codec_dai.name,
info->codec_dai.fmt,
info->codec_dai.sysclk);
return 0;
}
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) {
int ret;
ret = asoc_simple_card_parse_of(np, cinfo, dev,
&of_cpu,
&of_codec,
&of_platform);
if (ret < 0) {
if (ret != -EPROBE_DEFER)
dev_err(dev, "parse error %d\n", ret);
return ret;
}
}
} else {
cinfo = pdev->dev.platform_data;
}
if (!cinfo) {
dev_err(dev, "no info for asoc-simple-card\n");
return -EINVAL;
@ -69,10 +203,10 @@ 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;
}
@ -86,6 +220,9 @@ 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;
/*
@ -107,10 +244,17 @@ 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-card", },
{},
};
MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
static struct platform_driver asoc_simple_card = {
.driver = {
.name = "asoc-simple-card",
.owner = THIS_MODULE,
.of_match_table = asoc_simple_of_match,
},
.probe = asoc_simple_card_probe,
.remove = asoc_simple_card_remove,