ASoC: samsung: Add Odroid ASoC machine driver

This dedicated driver allows to support SoC specific clock
settings and helps to ensure proper number of channels gets
negotiated in multicodec system configurations.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

3 files changed, 229 insertions, 0 deletions

diff --git a/sound/soc/samsung/Kconfig b/sound/soc/samsung/Kconfig
index f1f1d7959a1b..0520f5afd7cc 100644
--- a/sound/soc/samsung/Kconfig
+++ b/sound/soc/samsung/Kconfig
@@ -185,6 +185,14 @@ config SND_SOC_SNOW
           Say Y if you want to add audio support for various Snow
           boards based on Exynos5 series of SoCs.
 
+config SND_SOC_ODROID
+        tristate "Audio support for Odroid XU3/XU4"
+        depends on SND_SOC_SAMSUNG && I2C
+        select SND_SOC_MAX98090
+        select SND_SAMSUNG_I2S
+        help
+          Say Y here to enable audio support for the Odroid XU3/XU4.
+
 config SND_SOC_ARNDALE_RT5631_ALC5631
         tristate "Audio support for RT5631(ALC5631) on Arndale Board"
         depends on I2C
diff --git a/sound/soc/samsung/Makefile b/sound/soc/samsung/Makefile
index b5df5e2e3d94..b6c2ee358333 100644
--- a/sound/soc/samsung/Makefile
+++ b/sound/soc/samsung/Makefile
@@ -40,6 +40,7 @@ snd-soc-tobermory-objs := tobermory.o
 snd-soc-lowland-objs := lowland.o
 snd-soc-littlemill-objs := littlemill.o
 snd-soc-bells-objs := bells.o
+snd-soc-odroid-objs := odroid.o
 snd-soc-arndale-rt5631-objs := arndale_rt5631.o
 snd-soc-tm2-wm5110-objs := tm2_wm5110.o
 
@@ -62,5 +63,6 @@ obj-$(CONFIG_SND_SOC_TOBERMORY) += snd-soc-tobermory.o
 obj-$(CONFIG_SND_SOC_LOWLAND) += snd-soc-lowland.o
 obj-$(CONFIG_SND_SOC_LITTLEMILL) += snd-soc-littlemill.o
 obj-$(CONFIG_SND_SOC_BELLS) += snd-soc-bells.o
+obj-$(CONFIG_SND_SOC_ODROID) += snd-soc-odroid.o
 obj-$(CONFIG_SND_SOC_ARNDALE_RT5631_ALC5631) += snd-soc-arndale-rt5631.o
 obj-$(CONFIG_SND_SOC_SAMSUNG_TM2_WM5110) += snd-soc-tm2-wm5110.o
diff --git a/sound/soc/samsung/odroid.c b/sound/soc/samsung/odroid.c
new file mode 100644
index 000000000000..0c0b00e40646
--- /dev/null
+++ b/sound/soc/samsung/odroid.c
@@ -0,0 +1,219 @@
+/*
+ * Copyright (C) 2017 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * 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/of_device.h>
+#include <linux/module.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include "i2s.h"
+#include "i2s-regs.h"
+
+struct odroid_priv {
+        struct snd_soc_card card;
+        struct snd_soc_dai_link dai_link;
+
+        struct clk *pll;
+        struct clk *rclk;
+};
+
+static int odroid_card_startup(struct snd_pcm_substream *substream)
+{
+        struct snd_pcm_runtime *runtime = substream->runtime;
+
+        snd_pcm_hw_constraint_single(runtime, SNDRV_PCM_HW_PARAM_CHANNELS, 2);
+        return 0;
+}
+
+static int odroid_card_hw_params(struct snd_pcm_substream *substream,
+                                      struct snd_pcm_hw_params *params)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct odroid_priv *priv = snd_soc_card_get_drvdata(rtd->card);
+        unsigned int pll_freq, rclk_freq;
+        int ret;
+
+        switch (params_rate(params)) {
+        case 32000:
+        case 64000:
+                pll_freq = 131072000U;
+                break;
+        case 44100:
+        case 88200:
+        case 176400:
+                pll_freq = 180633600U;
+                break;
+        case 48000:
+        case 96000:
+        case 192000:
+                pll_freq = 196608000U;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        ret = clk_set_rate(priv->pll, pll_freq + 1);
+        if (ret < 0)
+                return ret;
+
+        rclk_freq = params_rate(params) * 256 * 4;
+
+        ret = clk_set_rate(priv->rclk, rclk_freq);
+        if (ret < 0)
+                return ret;
+
+        if (rtd->num_codecs > 1) {
+                struct snd_soc_dai *codec_dai = rtd->codec_dais[1];
+
+                ret = snd_soc_dai_set_sysclk(codec_dai, 0, rclk_freq,
+                                             SND_SOC_CLOCK_IN);
+                if (ret < 0)
+                        return ret;
+        }
+
+        return 0;
+}
+
+static const struct snd_soc_ops odroid_card_ops = {
+        .startup = odroid_card_startup,
+        .hw_params = odroid_card_hw_params,
+};
+
+static void odroid_put_codec_of_nodes(struct snd_soc_dai_link *link)
+{
+        struct snd_soc_dai_link_component *component = link->codecs;
+        int i;
+
+        for (i = 0; i < link->num_codecs; i++, component++) {
+                if (!component->of_node)
+                        break;
+                of_node_put(component->of_node);
+        }
+}
+
+static int odroid_audio_probe(struct platform_device *pdev)
+{
+        struct device *dev = &pdev->dev;
+        struct device_node *cpu, *codec;
+        struct odroid_priv *priv;
+        struct snd_soc_dai_link *link;
+        struct snd_soc_card *card;
+        int ret;
+
+        priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+        if (!priv)
+                return -ENOMEM;
+
+        card = &priv->card;
+        card->dev = dev;
+
+        card->owner = THIS_MODULE;
+        card->fully_routed = true;
+
+        snd_soc_card_set_drvdata(card, priv);
+
+        priv->pll = devm_clk_get(dev, "epll");
+        if (IS_ERR(priv->pll))
+                return PTR_ERR(priv->pll);
+
+        priv->rclk = devm_clk_get(dev, "i2s_rclk");
+        if (IS_ERR(priv->rclk))
+                return PTR_ERR(priv->rclk);
+
+        ret = snd_soc_of_parse_card_name(card, "model");
+        if (ret < 0)
+                return ret;
+
+        if (of_property_read_bool(dev->of_node, "samsung,audio-widgets")) {
+                ret = snd_soc_of_parse_audio_simple_widgets(card,
+                                                "samsung,audio-widgets");
+                if (ret < 0)
+                        return ret;
+        }
+
+        if (of_property_read_bool(dev->of_node, "samsung,audio-routing")) {
+                ret = snd_soc_of_parse_audio_routing(card,
+                                                "samsung,audio-routing");
+                if (ret < 0)
+                        return ret;
+        }
+
+        link = &priv->dai_link;
+
+        link->ops = &odroid_card_ops;
+        link->dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
+                        SND_SOC_DAIFMT_CBS_CFS;
+
+        card->dai_link = &priv->dai_link;
+        card->num_links = 1;
+
+        cpu = of_get_child_by_name(dev->of_node, "cpu");
+        codec = of_get_child_by_name(dev->of_node, "codec");
+
+        link->cpu_of_node = of_parse_phandle(cpu, "sound-dai", 0);
+        if (!link->cpu_of_node) {
+                dev_err(dev, "Failed parsing cpu/sound-dai property\n");
+                return -EINVAL;
+        }
+
+        ret = snd_soc_of_get_dai_link_codecs(dev, codec, link);
+        if (ret < 0)
+                goto err_put_codec_n;
+
+        link->platform_of_node = link->cpu_of_node;
+
+        link->name = "Primary";
+        link->stream_name = link->name;
+
+        ret = devm_snd_soc_register_card(dev, card);
+        if (ret < 0) {
+                dev_err(dev, "snd_soc_register_card() failed: %d\n", ret);
+                goto err_put_i2s_n;
+        }
+
+        return 0;
+
+err_put_i2s_n:
+        of_node_put(link->cpu_of_node);
+err_put_codec_n:
+        odroid_put_codec_of_nodes(link);
+        return ret;
+}
+
+static int odroid_audio_remove(struct platform_device *pdev)
+{
+        struct odroid_priv *priv = platform_get_drvdata(pdev);
+
+        of_node_put(priv->dai_link.cpu_of_node);
+        odroid_put_codec_of_nodes(&priv->dai_link);
+
+        return 0;
+}
+
+static const struct of_device_id odroid_audio_of_match[] = {
+        { .compatible   = "samsung,odroid-xu3-audio" },
+        { .compatible   = "samsung,odroid-xu4-audio"},
+        { },
+};
+MODULE_DEVICE_TABLE(of, odroid_audio_of_match);
+
+static struct platform_driver odroid_audio_driver = {
+        .driver = {
+                .name           = "odroid-audio",
+                .of_match_table = odroid_audio_of_match,
+                .pm             = &snd_soc_pm_ops,
+        },
+        .probe  = odroid_audio_probe,
+        .remove = odroid_audio_remove,
+};
+module_platform_driver(odroid_audio_driver);
+
+MODULE_AUTHOR("Sylwester Nawrocki <s.nawrocki@samsung.com>");
+MODULE_DESCRIPTION("Odroid XU3/XU4 audio support");
+MODULE_LICENSE("GPL v2");