mirror of https://gitee.com/openkylin/linux.git
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
Mark Brown
parent
af91706d5d
commit
fa558c2801
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@ -0,0 +1,68 @@
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Simple-Card:
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Simple-Card specifies audio DAI connection of SoC <-> codec.
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Required properties:
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- compatible : "simple-audio-card"
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Optional properties:
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- simple-audio-card,format : CPU/CODEC common audio format.
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"i2s", "right_j", "left_j" , "dsp_a"
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"dsp_b", "ac97", "pdm", "msb", "lsb"
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Required subnodes:
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- simple-audio-card,cpu : CPU sub-node
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- simple-audio-card,codec : CODEC sub-node
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Required CPU/CODEC subnodes properties:
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- sound-dai : phandle and port of CPU/CODEC
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Optional CPU/CODEC subnodes properties:
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- format : CPU/CODEC specific audio format if needed.
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see simple-audio-card,format
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- frame-master : bool property. add this if subnode is frame master
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- bitclock-master : bool property. add this if subnode is bitclock master
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- bitclock-inversion : bool property. add this if subnode has clock inversion
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- frame-inversion : bool property. add this if subnode has frame inversion
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- clocks / system-clock-frequency : specify subnode's clock if needed.
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it can be specified via "clocks" if system has
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clock node (= common clock), or "system-clock-frequency"
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(if system doens't support common clock)
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Example:
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sound {
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compatible = "simple-audio-card";
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simple-audio-card,format = "left_j";
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simple-audio-card,cpu {
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sound-dai = <&sh_fsi2 0>;
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};
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simple-audio-card,codec {
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sound-dai = <&ak4648>;
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bitclock-master;
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frame-master;
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clocks = <&osc>;
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};
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};
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&i2c0 {
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ak4648: ak4648@12 {
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#sound-dai-cells = <0>;
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compatible = "asahi-kasei,ak4648";
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reg = <0x12>;
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};
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};
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sh_fsi2: sh_fsi2@ec230000 {
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#sound-dai-cells = <1>;
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compatible = "renesas,sh_fsi2";
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reg = <0xec230000 0x400>;
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interrupt-parent = <&gic>;
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interrupts = <0 146 0x4>;
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};
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@ -8,7 +8,8 @@
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/clk.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <sound/simple_card.h>
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@ -57,11 +58,144 @@ static int asoc_simple_card_dai_init(struct snd_soc_pcm_runtime *rtd)
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return 0;
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}
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static int
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asoc_simple_card_sub_parse_of(struct device_node *np,
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struct asoc_simple_dai *dai,
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struct device_node **node)
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{
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struct clk *clk;
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int ret;
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/*
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* get node via "sound-dai = <&phandle port>"
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* it will be used as xxx_of_node on soc_bind_dai_link()
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*/
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*node = of_parse_phandle(np, "sound-dai", 0);
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if (!*node)
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return -ENODEV;
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/* get dai->name */
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ret = snd_soc_of_get_dai_name(np, &dai->name);
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if (ret < 0)
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goto parse_error;
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/*
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* bitclock-inversion, frame-inversion
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* bitclock-master, frame-master
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* and specific "format" if it has
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*/
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dai->fmt = snd_soc_of_parse_daifmt(np, NULL);
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/*
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* dai->sysclk come from
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* "clocks = <&xxx>" (if system has common clock)
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* or "system-clock-frequency = <xxx>"
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*/
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clk = of_clk_get(np, 0);
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if (IS_ERR(clk))
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of_property_read_u32(np,
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"system-clock-frequency",
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&dai->sysclk);
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else
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dai->sysclk = clk_get_rate(clk);
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ret = 0;
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parse_error:
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of_node_put(*node);
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return ret;
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}
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static int asoc_simple_card_parse_of(struct device_node *node,
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struct asoc_simple_card_info *info,
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struct device *dev,
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struct device_node **of_cpu,
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struct device_node **of_codec,
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struct device_node **of_platform)
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{
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struct device_node *np;
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char *name;
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int ret = 0;
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/* get CPU/CODEC common format via simple-audio-card,format */
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info->daifmt = snd_soc_of_parse_daifmt(node, "simple-audio-card,") &
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(SND_SOC_DAIFMT_FORMAT_MASK | SND_SOC_DAIFMT_INV_MASK);
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/* CPU sub-node */
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ret = -EINVAL;
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np = of_get_child_by_name(node, "simple-audio-card,cpu");
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if (np)
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ret = asoc_simple_card_sub_parse_of(np,
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&info->cpu_dai,
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of_cpu);
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if (ret < 0)
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return ret;
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/* CODEC sub-node */
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ret = -EINVAL;
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np = of_get_child_by_name(node, "simple-audio-card,codec");
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if (np)
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ret = asoc_simple_card_sub_parse_of(np,
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&info->codec_dai,
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of_codec);
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if (ret < 0)
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return ret;
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/* card name is created from CPU/CODEC dai name */
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name = devm_kzalloc(dev,
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strlen(info->cpu_dai.name) +
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strlen(info->codec_dai.name) + 2,
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GFP_KERNEL);
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sprintf(name, "%s-%s", info->cpu_dai.name, info->codec_dai.name);
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info->name = info->card = name;
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/* simple-card assumes platform == cpu */
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*of_platform = *of_cpu;
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dev_dbg(dev, "card-name : %s\n", info->card);
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dev_dbg(dev, "platform : %04x\n", info->daifmt);
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dev_dbg(dev, "cpu : %s / %04x / %d\n",
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info->cpu_dai.name,
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info->cpu_dai.fmt,
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info->cpu_dai.sysclk);
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dev_dbg(dev, "codec : %s / %04x / %d\n",
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info->codec_dai.name,
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info->codec_dai.fmt,
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info->codec_dai.sysclk);
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return 0;
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}
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static int asoc_simple_card_probe(struct platform_device *pdev)
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{
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struct asoc_simple_card_info *cinfo = pdev->dev.platform_data;
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struct asoc_simple_card_info *cinfo;
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struct device_node *np = pdev->dev.of_node;
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struct device_node *of_cpu, *of_codec, *of_platform;
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struct device *dev = &pdev->dev;
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cinfo = NULL;
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of_cpu = NULL;
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of_codec = NULL;
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of_platform = NULL;
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if (np && of_device_is_available(np)) {
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cinfo = devm_kzalloc(dev, sizeof(*cinfo), GFP_KERNEL);
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if (cinfo) {
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int ret;
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ret = asoc_simple_card_parse_of(np, cinfo, dev,
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&of_cpu,
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&of_codec,
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&of_platform);
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if (ret < 0) {
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if (ret != -EPROBE_DEFER)
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dev_err(dev, "parse error %d\n", ret);
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return ret;
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}
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}
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} else {
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cinfo = pdev->dev.platform_data;
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}
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if (!cinfo) {
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dev_err(dev, "no info for asoc-simple-card\n");
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return -EINVAL;
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@ -69,10 +203,10 @@ static int asoc_simple_card_probe(struct platform_device *pdev)
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if (!cinfo->name ||
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!cinfo->card ||
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!cinfo->codec ||
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!cinfo->platform ||
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!cinfo->cpu_dai.name ||
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!cinfo->codec_dai.name) {
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!cinfo->codec_dai.name ||
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!(cinfo->codec || of_codec) ||
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!(cinfo->platform || of_platform) ||
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!(cinfo->cpu_dai.name || of_cpu)) {
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dev_err(dev, "insufficient asoc_simple_card_info settings\n");
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return -EINVAL;
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}
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@ -86,6 +220,9 @@ static int asoc_simple_card_probe(struct platform_device *pdev)
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cinfo->snd_link.platform_name = cinfo->platform;
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cinfo->snd_link.codec_name = cinfo->codec;
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cinfo->snd_link.codec_dai_name = cinfo->codec_dai.name;
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cinfo->snd_link.cpu_of_node = of_cpu;
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cinfo->snd_link.codec_of_node = of_codec;
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cinfo->snd_link.platform_of_node = of_platform;
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cinfo->snd_link.init = asoc_simple_card_dai_init;
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/*
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@ -107,10 +244,17 @@ static int asoc_simple_card_remove(struct platform_device *pdev)
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return snd_soc_unregister_card(&cinfo->snd_card);
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}
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static const struct of_device_id asoc_simple_of_match[] = {
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{ .compatible = "simple-audio-card", },
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{},
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};
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MODULE_DEVICE_TABLE(of, asoc_simple_of_match);
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static struct platform_driver asoc_simple_card = {
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.driver = {
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.name = "asoc-simple-card",
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.owner = THIS_MODULE,
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.of_match_table = asoc_simple_of_match,
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},
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.probe = asoc_simple_card_probe,
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.remove = asoc_simple_card_remove,
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