Support for loading the simple-card module via DeviceTree. It requests CPU/CODEC information.
Signed-off-by: Kuninori Morimoto kuninori.morimoto.gx@renesas.com --- v4 -> v5
- fixup spell miss - removed un-needed "clock node" example from simple-card.txt - add explain that clocks can be used if system has "common clock"
.../devicetree/bindings/sound/simple-card.txt | 66 ++++++++ sound/soc/generic/simple-card.c | 157 +++++++++++++++++++- 2 files changed, 217 insertions(+), 6 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..615a655 --- /dev/null +++ b/Documentation/devicetree/bindings/sound/simple-card.txt @@ -0,0 +1,66 @@ +Simple-Card: + +Simple-Card specifies audio DAI connection of SoC <-> codec. + +Required properties: + +- compatible : "simple-audio" + +Optional properties: + +- simple-audio,format : CPU/CODEC common audio format. + "i2s", "right_j", "left_j" , "dsp_a" + "dsp_b", "ac97", "pdm", "msb", "lsb" +Required subnodes: + +- simple-audio,cpu : CPU sub-node +- simple-audio,codec : CODEC sub-node + +Required CPU/CODEC subnodes properties: + +- sound-dai : phandle and port of CPU/CODEC + +Optional CPU/CODEC subnodes properties: + +- 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 can't use it. + +Example: + +sound { + compatible = "simple-audio"; + simple-audio,format = "left_j"; + + simple-audio,cpu { + sound-dai = <&sh_fsi2 0>; + }; + + simple-audio,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>; +}; diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c index b2fbb70..da1fd7e 100644 --- a/sound/soc/generic/simple-card.c +++ b/sound/soc/generic/simple-card.c @@ -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 +58,145 @@ 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,format */ + info->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio,") & + (SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK); + + /* CPU sub-node */ + ret = -EINVAL; + np = of_get_child_by_name(node, "simple-audio,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,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 */ + of_property_read_string(node, "simple-audio,card-name", &info->card); + 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 +204,10 @@ 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 +221,9 @@ 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 +245,17 @@ 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", }, + {}, +}; +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,