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>

1 files changed, 150 insertions, 6 deletions

diff --git a/sound/soc/generic/simple-card.c b/sound/soc/generic/simple-card.c
index b2fbb7075a6c..7a9b6b4898c0 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 +58,144 @@ 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,