MLK-13904-3: ASoC: fsl: add audio machine driver base on rpmsg

Add machine driver, which is using the dummy codec.

Signed-off-by: Shengjiu Wang <shengjiu.wang@freescale.com>
Acked-by: Robin Gong <yibin.gong@nxp.com>

Documentation/devicetree/bindings/sound/imx-audio-rpmsg.txt

@@ -0,0 +1,13 @@
+Freescale i.MX audio complex with rpmsg devices
+
+Required properties:
+- compatible : "fsl,imx-audio-rpmsg"
+- model : The user-visible name of this sound complex
+- cpu-dai : The phandle of the i.MX rpmsg i2s device.
+
+Example:
+sound-rpmsg {
+	compatible = "fsl,imx-audio-rpmsg";
+	model = "rpmsg-audio";
+	cpu-dai = <&rpmsg_i2s>;
+};

sound/soc/fsl/Kconfig

@@ -323,6 +323,17 @@ config SND_SOC_IMX_WM8962_ANDROID
 	  Say Y if you want to add support for SoC audio on an i.MX board with
 	  a wm8962 codec in android.
 
+config SND_SOC_IMX_RPMSG
+	tristate "SoC Audio support for i.MX boards with rpmsg"
+	depends on OF && I2C && INPUT
+	select SND_SOC_IMX_PCM_RPMSG
+	select SND_SOC_FSL_RPMSG_I2S
+	help
+	  SoC Audio support for i.MX boards with rpmsg.
+	  There should be rpmsg devices defined in other core
+	  Say Y if you want to add support for SoC audio on an i.MX board with
+	  a rpmsg devices.
+
 config SND_SOC_IMX_ES8328
 	tristate "SoC Audio support for i.MX boards with the ES8328 codec"
 	depends on OF && (I2C || SPI)

sound/soc/fsl/Makefile

@@ -71,6 +71,7 @@ snd-soc-imx-mc13783-objs := imx-mc13783.o
 snd-soc-imx-mqs-objs := imx-mqs.o
 snd-soc-imx-si476x-objs := imx-si476x.o
 snd-soc-imx-hdmi-objs := imx-hdmi.o
+snd-soc-imx-rpmsg-objs := imx-rpmsg.o
 
 obj-$(CONFIG_SND_SOC_EUKREA_TLV320) += snd-soc-eukrea-tlv320.o
 obj-$(CONFIG_SND_SOC_PHYCORE_AC97) += snd-soc-phycore-ac97.o
@@ -82,6 +83,7 @@ obj-$(CONFIG_SND_SOC_IMX_SGTL5000) += snd-soc-imx-sgtl5000.o
 obj-${CONFIG_SND_SOC_IMX_WM8958} += snd-soc-imx-wm8958.o
 obj-$(CONFIG_SND_SOC_IMX_WM8960) += snd-soc-imx-wm8960.o
 obj-$(CONFIG_SND_SOC_IMX_WM8962) += snd-soc-imx-wm8962.o
+obj-$(CONFIG_SND_SOC_IMX_RPMSG) += snd-soc-imx-rpmsg.o
 obj-$(CONFIG_SND_SOC_IMX_SII902X) += snd-soc-imx-sii902x.o
 obj-$(CONFIG_SND_SOC_IMX_SPDIF) += snd-soc-imx-spdif.o
 obj-$(CONFIG_SND_SOC_IMX_MC13783) += snd-soc-imx-mc13783.o

sound/soc/fsl/imx-rpmsg.c

@@ -0,0 +1,113 @@
+/*
+ * Copyright (C) 2017 NXP
+ *
+ * The code contained herein is licensed under the GNU General Public
+ * License. You may obtain a copy of the GNU General Public License
+ * Version 2 or later at the following locations:
+ *
+ * http://www.opensource.org/licenses/gpl-license.html
+ * http://www.gnu.org/copyleft/gpl.html
+ */
+
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/i2c.h>
+#include <linux/of_gpio.h>
+#include <linux/slab.h>
+#include <linux/gpio.h>
+#include <linux/clk.h>
+#include <sound/soc.h>
+#include <sound/jack.h>
+#include <sound/control.h>
+#include <sound/pcm_params.h>
+#include <sound/soc-dapm.h>
+#include <linux/pinctrl/consumer.h>
+#include "fsl_rpmsg_i2s.h"
+
+struct imx_rpmsg_data {
+	struct snd_soc_dai_link dai[1];
+	struct snd_soc_card card;
+};
+
+static int imx_rpmsg_probe(struct platform_device *pdev)
+{
+	struct device_node *cpu_np;
+	struct platform_device *cpu_pdev;
+	struct imx_rpmsg_data *data;
+	int ret;
+
+	cpu_np = of_parse_phandle(pdev->dev.of_node, "cpu-dai", 0);
+	if (!cpu_np) {
+		dev_err(&pdev->dev, "cpu dai phandle missing or invalid\n");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+	if (!data) {
+		ret = -ENOMEM;
+		goto fail;
+	}
+
+	cpu_pdev = of_find_device_by_node(cpu_np);
+	if (!cpu_pdev) {
+		dev_err(&pdev->dev, "failed to find rpmsg platform device\n");
+		ret = -EINVAL;
+		goto fail;
+	}
+
+	data->dai[0].name = "rpmsg hifi";
+	data->dai[0].stream_name = "rpmsg hifi";
+	data->dai[0].codec_dai_name = "snd-soc-dummy-dai";
+	data->dai[0].codec_name = "snd-soc-dummy";
+	data->dai[0].cpu_dai_name = dev_name(&cpu_pdev->dev);
+	data->dai[0].platform_of_node = cpu_np;
+	data->dai[0].playback_only = false;
+	data->dai[0].capture_only = false;
+	data->dai[0].dai_fmt = SND_SOC_DAIFMT_I2S |
+			    SND_SOC_DAIFMT_NB_NF |
+			    SND_SOC_DAIFMT_CBM_CFM;
+	data->card.num_links = 1;
+	data->card.dai_link = data->dai;
+
+	data->card.dev = &pdev->dev;
+	data->card.owner = THIS_MODULE;
+	ret = snd_soc_of_parse_card_name(&data->card, "model");
+	if (ret)
+		goto fail;
+
+	platform_set_drvdata(pdev, &data->card);
+	snd_soc_card_set_drvdata(&data->card, data);
+	ret = devm_snd_soc_register_card(&pdev->dev, &data->card);
+	if (ret) {
+		dev_err(&pdev->dev, "snd_soc_register_card failed (%d)\n", ret);
+		goto fail;
+	}
+
+fail:
+	if (cpu_np)
+		of_node_put(cpu_np);
+	return ret;
+}
+
+static const struct of_device_id imx_rpmsg_dt_ids[] = {
+	{ .compatible = "fsl,imx-audio-rpmsg", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, imx_rpmsg_dt_ids);
+
+static struct platform_driver imx_rpmsg_driver = {
+	.driver = {
+		.name = "imx-audio-rpmsg",
+		.owner = THIS_MODULE,
+		.pm = &snd_soc_pm_ops,
+		.of_match_table = imx_rpmsg_dt_ids,
+	},
+	.probe = imx_rpmsg_probe,
+};
+module_platform_driver(imx_rpmsg_driver);
+
+MODULE_AUTHOR("Freescale Semiconductor, Inc.");
+MODULE_DESCRIPTION("Freescale i.MX rpmsg audio ASoC machine driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:imx-rpmsg");