sound: ASoC: add ASoC board driver for Armada 370 DB

This commit adds a simple ASoC board driver fo the Armada 370
Development Board, which connects the audio unit of the Armada 370 SoC
to the I2C-based CS42L51.

For now, only the analog audio input and output through the CS42L51
are supported, but a followup patch adds S/PDIF support to this
driver.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

diff --git a/Documentation/devicetree/bindings/sound/armada-370db-audio.txt b/Documentation/devicetree/bindings/sound/armada-370db-audio.txt
new file mode 100644 (file)
index 0000000..3893b4d
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/armada-370db-audio.txt
@@ -0,0 +1,24 @@
+Device Tree bindings for the Armada 370 DB audio
+================================================
+
+These Device Tree bindings are used to describe the audio complex
+found on the Armada 370 DB platform.
+
+Mandatory properties:
+
+ * compatible: must be "marvell,a370db-audio"
+
+ * marvell,audio-controller: a phandle that points to the audio
+   controller of the Armada 370 SoC.
+
+ * marvell,audio-codec: a phandle that points to the analog audio
+   codec connected to the Armada 370 SoC.
+
+Example:
+
+       sound {
+             compatible = "marvell,a370db-audio";
+             marvell,audio-controller = <&audio_controller>;
+             marvell,audio-codec = <&audio_codec>;
+             status = "okay";
+       };

diff --git a/sound/soc/kirkwood/Kconfig b/sound/soc/kirkwood/Kconfig
index 764a0ef..2dc3ecf 100644 (file)
--- a/sound/soc/kirkwood/Kconfig
+++ b/sound/soc/kirkwood/Kconfig
@@ -6,6 +6,14 @@ config SND_KIRKWOOD_SOC
          the Kirkwood I2S interface. You will also need to select the
          audio interfaces to support below.
 
+config SND_KIRKWOOD_SOC_ARMADA370_DB
+       tristate "SoC Audio support for Armada 370 DB"
+       depends on SND_KIRKWOOD_SOC && (ARCH_MVEBU || COMPILE_TEST) && I2C
+       select SND_SOC_CS42L51
+       help
+         Say Y if you want to add support for SoC audio on
+         the Armada 370 Development Board.
+
 config SND_KIRKWOOD_SOC_OPENRD
        tristate "SoC Audio support for Kirkwood Openrd Client"
        depends on SND_KIRKWOOD_SOC && (MACH_OPENRD_CLIENT || MACH_OPENRD_ULTIMATE || COMPILE_TEST)

diff --git a/sound/soc/kirkwood/Makefile b/sound/soc/kirkwood/Makefile
index 9e78138..7c1d8fe 100644 (file)
--- a/sound/soc/kirkwood/Makefile
+++ b/sound/soc/kirkwood/Makefile
@@ -4,6 +4,8 @@ obj-$(CONFIG_SND_KIRKWOOD_SOC) += snd-soc-kirkwood.o
 
 snd-soc-openrd-objs := kirkwood-openrd.o
 snd-soc-t5325-objs := kirkwood-t5325.o
+snd-soc-armada-370-db-objs := armada-370-db.o
 
+obj-$(CONFIG_SND_KIRKWOOD_SOC_ARMADA370_DB) += snd-soc-armada-370-db.o
 obj-$(CONFIG_SND_KIRKWOOD_SOC_OPENRD) += snd-soc-openrd.o
 obj-$(CONFIG_SND_KIRKWOOD_SOC_T5325) += snd-soc-t5325.o

diff --git a/sound/soc/kirkwood/armada-370-db.c b/sound/soc/kirkwood/armada-370-db.c
new file mode 100644 (file)
index 0000000..977639b
--- /dev/null
+++ b/sound/soc/kirkwood/armada-370-db.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2014 Marvell
+ *
+ * Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <sound/soc.h>
+#include <linux/of.h>
+#include <linux/platform_data/asoc-kirkwood.h>
+#include "../codecs/cs42l51.h"
+
+static int a370db_hw_params(struct snd_pcm_substream *substream,
+                           struct snd_pcm_hw_params *params)
+{
+       struct snd_soc_pcm_runtime *rtd = substream->private_data;
+       struct snd_soc_dai *codec_dai = rtd->codec_dai;
+       unsigned int freq;
+
+       switch (params_rate(params)) {
+       default:
+       case 44100:
+               freq = 11289600;
+               break;
+       case 48000:
+               freq = 12288000;
+               break;
+       case 96000:
+               freq = 24576000;
+               break;
+       }
+
+       return snd_soc_dai_set_sysclk(codec_dai, 0, freq, SND_SOC_CLOCK_IN);
+}
+
+static struct snd_soc_ops a370db_ops = {
+       .hw_params = a370db_hw_params,
+};
+
+static const struct snd_soc_dapm_widget a370db_dapm_widgets[] = {
+       SND_SOC_DAPM_HP("Out Jack", NULL),
+       SND_SOC_DAPM_LINE("In Jack", NULL),
+};
+
+static const struct snd_soc_dapm_route a370db_route[] = {
+       { "Out Jack",   NULL,   "HPL" },
+       { "Out Jack",   NULL,   "HPR" },
+       { "AIN1L",      NULL,   "In Jack" },
+       { "AIN1L",      NULL,   "In Jack" },
+};
+
+static struct snd_soc_dai_link a370db_dai[] = {
+{
+       .name = "CS42L51",
+       .stream_name = "analog",
+       .cpu_dai_name = "i2s",
+       .codec_dai_name = "cs42l51-hifi",
+       .dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_CBS_CFS,
+       .ops = &a370db_ops,
+},
+};
+
+static struct snd_soc_card a370db = {
+       .name = "a370db",
+       .owner = THIS_MODULE,
+       .dai_link = a370db_dai,
+       .num_links = ARRAY_SIZE(a370db_dai),
+       .dapm_widgets = a370db_dapm_widgets,
+       .num_dapm_widgets = ARRAY_SIZE(a370db_dapm_widgets),
+       .dapm_routes = a370db_route,
+       .num_dapm_routes = ARRAY_SIZE(a370db_route),
+};
+
+static int a370db_probe(struct platform_device *pdev)
+{
+       struct snd_soc_card *card = &a370db;
+
+       card->dev = &pdev->dev;
+
+       a370db_dai[0].cpu_of_node =
+               of_parse_phandle(pdev->dev.of_node,
+                                "marvell,audio-controller", 0);
+       a370db_dai[0].platform_of_node = a370db_dai[0].cpu_of_node;
+
+       a370db_dai[0].codec_of_node =
+               of_parse_phandle(pdev->dev.of_node,
+                                "marvell,audio-codec", 0);
+
+       return devm_snd_soc_register_card(card->dev, card);
+}
+
+static const struct of_device_id a370db_dt_ids[] = {
+       { .compatible = "marvell,a370db-audio" },
+       { },
+};
+
+static struct platform_driver a370db_driver = {
+       .driver         = {
+               .name   = "a370db-audio",
+               .owner  = THIS_MODULE,
+               .of_match_table = of_match_ptr(a370db_dt_ids),
+       },
+       .probe          = a370db_probe,
+};
+
+module_platform_driver(a370db_driver);
+
+MODULE_AUTHOR("Thomas Petazzoni <thomas.petazzoni@free-electrons.com>");
+MODULE_DESCRIPTION("ALSA SoC a370db audio client");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:a370db-audio");