Date:   Tue, 13 Jun 2017 22:09:03 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Sugar Zhang <sugar.zhang@...k-chips.com>
Cc:     Mark Brown <broonie@...nel.org>, heiko@...ech.de,
        broonie@...nel.org, Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Takashi Iwai <tiwai@...e.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        linux-rockchip@...ts.infradead.org,
        Rob Herring <robh+dt@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, alsa-devel@...a-project.org
Subject: Applied "ASoC: rockchip: add support for pdm controller" to the asoc tree

The patch

   ASoC: rockchip: add support for pdm controller

has been applied to the asoc tree at

   git://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git 

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.  

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

>From fc05a5b222530617d99d0e803abb262130fdb0c4 Mon Sep 17 00:00:00 2001
From: Sugar Zhang <sugar.zhang@...k-chips.com>
Date: Tue, 13 Jun 2017 15:27:46 +0800
Subject: [PATCH] ASoC: rockchip: add support for pdm controller

The Pulse Density Modulation Interface Controller (PDMC) is
a PDM interface controller and decoder that support PDM format.
It integrates a clock generator driving the PDM microphone
and embeds filters which decimate the incoming bit stream to
obtain most common audio rates.

Signed-off-by: Sugar Zhang <sugar.zhang@...k-chips.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 .../devicetree/bindings/sound/rockchip,pdm.txt     |  39 ++
 sound/soc/rockchip/Kconfig                         |   9 +
 sound/soc/rockchip/Makefile                        |   2 +
 sound/soc/rockchip/rockchip_pdm.c                  | 516 +++++++++++++++++++++
 sound/soc/rockchip/rockchip_pdm.h                  |  83 ++++
 5 files changed, 649 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/sound/rockchip,pdm.txt
 create mode 100644 sound/soc/rockchip/rockchip_pdm.c
 create mode 100644 sound/soc/rockchip/rockchip_pdm.h

diff --git a/Documentation/devicetree/bindings/sound/rockchip,pdm.txt b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
new file mode 100644
index 000000000000..921729de7346
--- /dev/null
+++ b/Documentation/devicetree/bindings/sound/rockchip,pdm.txt
@@ -0,0 +1,39 @@
+* Rockchip PDM controller
+
+Required properties:
+
+- compatible: "rockchip,pdm"
+- reg: physical base address of the controller and length of memory mapped
+  region.
+- dmas: DMA specifiers for rx dma. See the DMA client binding,
+	Documentation/devicetree/bindings/dma/dma.txt
+- dma-names: should include "rx".
+- clocks: a list of phandle + clock-specifer pairs, one for each entry in clock-names.
+- clock-names: should contain following:
+   - "pdm_hclk": clock for PDM BUS
+   - "pdm_clk" : clock for PDM controller
+- pinctrl-names: Must contain a "default" entry.
+- pinctrl-N: One property must exist for each entry in
+	     pinctrl-names. See ../pinctrl/pinctrl-bindings.txt
+	     for details of the property values.
+
+Example for rk3328 PDM controller:
+
+pdm: pdm@...40000 {
+	compatible = "rockchip,pdm";
+	reg = <0x0 0xff040000 0x0 0x1000>;
+	clocks = <&clk_pdm>, <&clk_gates28 0>;
+	clock-names = "pdm_clk", "pdm_hclk";
+	dmas = <&pdma 16>;
+	#dma-cells = <1>;
+	dma-names = "rx";
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&pdmm0_clk
+		     &pdmm0_fsync
+		     &pdmm0_sdi0
+		     &pdmm0_sdi1
+		     &pdmm0_sdi2
+		     &pdmm0_sdi3>;
+	pinctrl-1 = <&pdmm0_sleep>;
+	status = "disabled";
+};
diff --git a/sound/soc/rockchip/Kconfig b/sound/soc/rockchip/Kconfig
index e3ca1e973de5..c84487805876 100644
--- a/sound/soc/rockchip/Kconfig
+++ b/sound/soc/rockchip/Kconfig
@@ -15,6 +15,15 @@ config SND_SOC_ROCKCHIP_I2S
 	  Rockchip I2S device. The device supports upto maximum of
 	  8 channels each for play and record.
 
+config SND_SOC_ROCKCHIP_PDM
+	tristate "Rockchip PDM Controller Driver"
+	depends on CLKDEV_LOOKUP && SND_SOC_ROCKCHIP
+	select SND_SOC_GENERIC_DMAENGINE_PCM
+	help
+	  Say Y or M if you want to add support for PDM driver for
+	  Rockchip PDM Controller. The Controller supports up to maximum of
+	  8 channels record.
+
 config SND_SOC_ROCKCHIP_SPDIF
 	tristate "Rockchip SPDIF Device Driver"
 	depends on CLKDEV_LOOKUP && SND_SOC_ROCKCHIP
diff --git a/sound/soc/rockchip/Makefile b/sound/soc/rockchip/Makefile
index 991f91bea9f9..105f0e14a4ab 100644
--- a/sound/soc/rockchip/Makefile
+++ b/sound/soc/rockchip/Makefile
@@ -1,8 +1,10 @@
 # ROCKCHIP Platform Support
 snd-soc-rockchip-i2s-objs := rockchip_i2s.o
+snd-soc-rockchip-pdm-objs := rockchip_pdm.o
 snd-soc-rockchip-spdif-objs := rockchip_spdif.o
 
 obj-$(CONFIG_SND_SOC_ROCKCHIP_I2S) += snd-soc-rockchip-i2s.o
+obj-$(CONFIG_SND_SOC_ROCKCHIP_PDM) += snd-soc-rockchip-pdm.o
 obj-$(CONFIG_SND_SOC_ROCKCHIP_SPDIF) += snd-soc-rockchip-spdif.o
 
 snd-soc-rockchip-max98090-objs := rockchip_max98090.o
diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
new file mode 100644
index 000000000000..c5ddeed97260
--- /dev/null
+++ b/sound/soc/rockchip/rockchip_pdm.c
@@ -0,0 +1,516 @@
+/*
+ * Rockchip PDM ALSA SoC Digital Audio Interface(DAI)  driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <sound/dmaengine_pcm.h>
+#include <sound/pcm_params.h>
+
+#include "rockchip_pdm.h"
+
+#define PDM_DMA_BURST_SIZE	(16) /* size * width: 16*4 = 64 bytes */
+
+struct rk_pdm_dev {
+	struct device *dev;
+	struct clk *clk;
+	struct clk *hclk;
+	struct regmap *regmap;
+	struct snd_dmaengine_dai_dma_data capture_dma_data;
+};
+
+struct rk_pdm_clkref {
+	unsigned int sr;
+	unsigned int clk;
+};
+
+static struct rk_pdm_clkref clkref[] = {
+	{ 8000, 40960000 },
+	{ 11025, 56448000 },
+	{ 12000, 61440000 },
+};
+
+static unsigned int get_pdm_clk(unsigned int sr)
+{
+	unsigned int i, count, clk, div;
+
+	clk = 0;
+	if (!sr)
+		return clk;
+
+	count = ARRAY_SIZE(clkref);
+	for (i = 0; i < count; i++) {
+		if (sr % clkref[i].sr)
+			continue;
+		div = sr / clkref[i].sr;
+		if ((div & (div - 1)) == 0) {
+			clk = clkref[i].clk;
+			break;
+		}
+	}
+
+	return clk;
+}
+
+static inline struct rk_pdm_dev *to_info(struct snd_soc_dai *dai)
+{
+	return snd_soc_dai_get_drvdata(dai);
+}
+
+static void rockchip_pdm_rxctrl(struct rk_pdm_dev *pdm, int on)
+{
+	if (on) {
+		regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
+				   PDM_DMA_RD_MSK, PDM_DMA_RD_EN);
+		regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
+				   PDM_RX_MASK, PDM_RX_START);
+	} else {
+		regmap_update_bits(pdm->regmap, PDM_DMA_CTRL,
+				   PDM_DMA_RD_MSK, PDM_DMA_RD_DIS);
+		regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
+				   PDM_RX_MASK | PDM_RX_CLR_MASK,
+				   PDM_RX_STOP | PDM_RX_CLR_WR);
+	}
+}
+
+static int rockchip_pdm_hw_params(struct snd_pcm_substream *substream,
+				  struct snd_pcm_hw_params *params,
+				  struct snd_soc_dai *dai)
+{
+	struct rk_pdm_dev *pdm = to_info(dai);
+	unsigned int val = 0;
+	unsigned int clk_rate, clk_div, samplerate;
+	int ret;
+
+	samplerate = params_rate(params);
+	clk_rate = get_pdm_clk(samplerate);
+	if (!clk_rate)
+		return -EINVAL;
+
+	ret = clk_set_rate(pdm->clk, clk_rate);
+	if (ret)
+		return -EINVAL;
+
+	clk_div = DIV_ROUND_CLOSEST(clk_rate, samplerate);
+
+	switch (clk_div) {
+	case 320:
+		val = PDM_CLK_320FS;
+		break;
+	case 640:
+		val = PDM_CLK_640FS;
+		break;
+	case 1280:
+		val = PDM_CLK_1280FS;
+		break;
+	case 2560:
+		val = PDM_CLK_2560FS;
+		break;
+	case 5120:
+		val = PDM_CLK_5120FS;
+		break;
+	default:
+		dev_err(pdm->dev, "unsupported div: %d\n", clk_div);
+		return -EINVAL;
+	}
+
+	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_DS_RATIO_MSK, val);
+	regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
+			   PDM_HPF_CF_MSK, PDM_HPF_60HZ);
+	regmap_update_bits(pdm->regmap, PDM_HPF_CTRL,
+			   PDM_HPF_LE | PDM_HPF_RE, PDM_HPF_LE | PDM_HPF_RE);
+	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, PDM_CLK_EN, PDM_CLK_EN);
+
+	val = 0;
+	switch (params_format(params)) {
+	case SNDRV_PCM_FORMAT_S8:
+		val |= PDM_VDW(8);
+		break;
+	case SNDRV_PCM_FORMAT_S16_LE:
+		val |= PDM_VDW(16);
+		break;
+	case SNDRV_PCM_FORMAT_S20_3LE:
+		val |= PDM_VDW(20);
+		break;
+	case SNDRV_PCM_FORMAT_S24_LE:
+		val |= PDM_VDW(24);
+		break;
+	case SNDRV_PCM_FORMAT_S32_LE:
+		val |= PDM_VDW(32);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	switch (params_channels(params)) {
+	case 8:
+		val |= PDM_PATH3_EN;
+		/* fallthrough */
+	case 6:
+		val |= PDM_PATH2_EN;
+		/* fallthrough */
+	case 4:
+		val |= PDM_PATH1_EN;
+		/* fallthrough */
+	case 2:
+		val |= PDM_PATH0_EN;
+		break;
+	default:
+		dev_err(pdm->dev, "invalid channel: %d\n",
+			params_channels(params));
+		return -EINVAL;
+	}
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+		regmap_update_bits(pdm->regmap, PDM_CTRL0,
+				   PDM_PATH_MSK | PDM_VDW_MSK,
+				   val);
+		regmap_update_bits(pdm->regmap, PDM_DMA_CTRL, PDM_DMA_RDL_MSK,
+				   PDM_DMA_RDL(16));
+		regmap_update_bits(pdm->regmap, PDM_SYSCONFIG,
+				   PDM_RX_MASK | PDM_RX_CLR_MASK,
+				   PDM_RX_STOP | PDM_RX_CLR_WR);
+	}
+
+	return 0;
+}
+
+static int rockchip_pdm_set_fmt(struct snd_soc_dai *cpu_dai,
+				unsigned int fmt)
+{
+	struct rk_pdm_dev *pdm = to_info(cpu_dai);
+	unsigned int mask = 0, val = 0;
+
+	mask = PDM_CKP_MSK;
+	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+	case SND_SOC_DAIFMT_NB_NF:
+		val = PDM_CKP_NORMAL;
+		break;
+	case SND_SOC_DAIFMT_IB_NF:
+		val = PDM_CKP_INVERTED;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	regmap_update_bits(pdm->regmap, PDM_CLK_CTRL, mask, val);
+
+	return 0;
+}
+
+static int rockchip_pdm_trigger(struct snd_pcm_substream *substream, int cmd,
+				struct snd_soc_dai *dai)
+{
+	struct rk_pdm_dev *pdm = to_info(dai);
+	int ret = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+			rockchip_pdm_rxctrl(pdm, 1);
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_STOP:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+			rockchip_pdm_rxctrl(pdm, 0);
+		break;
+	default:
+		ret = -EINVAL;
+		break;
+	}
+
+	return ret;
+}
+
+static int rockchip_pdm_dai_probe(struct snd_soc_dai *dai)
+{
+	struct rk_pdm_dev *pdm = to_info(dai);
+
+	dai->capture_dma_data = &pdm->capture_dma_data;
+
+	return 0;
+}
+
+static struct snd_soc_dai_ops rockchip_pdm_dai_ops = {
+	.set_fmt = rockchip_pdm_set_fmt,
+	.trigger = rockchip_pdm_trigger,
+	.hw_params = rockchip_pdm_hw_params,
+};
+
+#define ROCKCHIP_PDM_RATES SNDRV_PCM_RATE_8000_192000
+#define ROCKCHIP_PDM_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | \
+			      SNDRV_PCM_FMTBIT_S20_3LE | \
+			      SNDRV_PCM_FMTBIT_S24_LE | \
+			      SNDRV_PCM_FMTBIT_S32_LE)
+
+static struct snd_soc_dai_driver rockchip_pdm_dai = {
+	.probe = rockchip_pdm_dai_probe,
+	.capture = {
+		.stream_name = "Capture",
+		.channels_min = 2,
+		.channels_max = 8,
+		.rates = ROCKCHIP_PDM_RATES,
+		.formats = ROCKCHIP_PDM_FORMATS,
+	},
+	.ops = &rockchip_pdm_dai_ops,
+	.symmetric_rates = 1,
+};
+
+static const struct snd_soc_component_driver rockchip_pdm_component = {
+	.name = "rockchip-pdm",
+};
+
+static int rockchip_pdm_runtime_suspend(struct device *dev)
+{
+	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+
+	clk_disable_unprepare(pdm->clk);
+	clk_disable_unprepare(pdm->hclk);
+
+	return 0;
+}
+
+static int rockchip_pdm_runtime_resume(struct device *dev)
+{
+	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+	int ret;
+
+	ret = clk_prepare_enable(pdm->clk);
+	if (ret) {
+		dev_err(pdm->dev, "clock enable failed %d\n", ret);
+		return ret;
+	}
+
+	ret = clk_prepare_enable(pdm->hclk);
+	if (ret) {
+		dev_err(pdm->dev, "hclock enable failed %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static bool rockchip_pdm_wr_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case PDM_SYSCONFIG:
+	case PDM_CTRL0:
+	case PDM_CTRL1:
+	case PDM_CLK_CTRL:
+	case PDM_HPF_CTRL:
+	case PDM_FIFO_CTRL:
+	case PDM_DMA_CTRL:
+	case PDM_INT_EN:
+	case PDM_INT_CLR:
+	case PDM_DATA_VALID:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case PDM_SYSCONFIG:
+	case PDM_CTRL0:
+	case PDM_CTRL1:
+	case PDM_CLK_CTRL:
+	case PDM_HPF_CTRL:
+	case PDM_FIFO_CTRL:
+	case PDM_DMA_CTRL:
+	case PDM_INT_EN:
+	case PDM_INT_CLR:
+	case PDM_INT_ST:
+	case PDM_DATA_VALID:
+	case PDM_VERSION:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case PDM_SYSCONFIG:
+	case PDM_INT_CLR:
+	case PDM_INT_ST:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static const struct regmap_config rockchip_pdm_regmap_config = {
+	.reg_bits = 32,
+	.reg_stride = 4,
+	.val_bits = 32,
+	.max_register = PDM_VERSION,
+	.writeable_reg = rockchip_pdm_wr_reg,
+	.readable_reg = rockchip_pdm_rd_reg,
+	.volatile_reg = rockchip_pdm_volatile_reg,
+	.cache_type = REGCACHE_FLAT,
+};
+
+static int rockchip_pdm_probe(struct platform_device *pdev)
+{
+	struct rk_pdm_dev *pdm;
+	struct resource *res;
+	void __iomem *regs;
+	int ret;
+
+	pdm = devm_kzalloc(&pdev->dev, sizeof(*pdm), GFP_KERNEL);
+	if (!pdm)
+		return -ENOMEM;
+
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	regs = devm_ioremap_resource(&pdev->dev, res);
+	if (IS_ERR(regs))
+		return PTR_ERR(regs);
+
+	pdm->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
+					    &rockchip_pdm_regmap_config);
+	if (IS_ERR(pdm->regmap))
+		return PTR_ERR(pdm->regmap);
+
+	pdm->capture_dma_data.addr = res->start + PDM_RXFIFO_DATA;
+	pdm->capture_dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+	pdm->capture_dma_data.maxburst = PDM_DMA_BURST_SIZE;
+
+	pdm->dev = &pdev->dev;
+	dev_set_drvdata(&pdev->dev, pdm);
+
+	pdm->clk = devm_clk_get(&pdev->dev, "pdm_clk");
+	if (IS_ERR(pdm->clk))
+		return PTR_ERR(pdm->clk);
+
+	pdm->hclk = devm_clk_get(&pdev->dev, "pdm_hclk");
+	if (IS_ERR(pdm->hclk))
+		return PTR_ERR(pdm->hclk);
+
+	ret = clk_prepare_enable(pdm->hclk);
+	if (ret)
+		return ret;
+
+	pm_runtime_enable(&pdev->dev);
+	if (!pm_runtime_enabled(&pdev->dev)) {
+		ret = rockchip_pdm_runtime_resume(&pdev->dev);
+		if (ret)
+			goto err_pm_disable;
+	}
+
+	ret = devm_snd_soc_register_component(&pdev->dev,
+					      &rockchip_pdm_component,
+					      &rockchip_pdm_dai, 1);
+
+	if (ret) {
+		dev_err(&pdev->dev, "could not register dai: %d\n", ret);
+		goto err_suspend;
+	}
+
+	ret = devm_snd_dmaengine_pcm_register(&pdev->dev, NULL, 0);
+	if (ret) {
+		dev_err(&pdev->dev, "could not register pcm: %d\n", ret);
+		goto err_suspend;
+	}
+
+	return 0;
+
+err_suspend:
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		rockchip_pdm_runtime_suspend(&pdev->dev);
+err_pm_disable:
+	pm_runtime_disable(&pdev->dev);
+
+	clk_disable_unprepare(pdm->hclk);
+
+	return ret;
+}
+
+static int rockchip_pdm_remove(struct platform_device *pdev)
+{
+	struct rk_pdm_dev *pdm = dev_get_drvdata(&pdev->dev);
+
+	pm_runtime_disable(&pdev->dev);
+	if (!pm_runtime_status_suspended(&pdev->dev))
+		rockchip_pdm_runtime_suspend(&pdev->dev);
+
+	clk_disable_unprepare(pdm->clk);
+	clk_disable_unprepare(pdm->hclk);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int rockchip_pdm_suspend(struct device *dev)
+{
+	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+
+	regcache_mark_dirty(pdm->regmap);
+
+	return 0;
+}
+
+static int rockchip_pdm_resume(struct device *dev)
+{
+	struct rk_pdm_dev *pdm = dev_get_drvdata(dev);
+	int ret;
+
+	ret = pm_runtime_get_sync(dev);
+	if (ret < 0)
+		return ret;
+
+	ret = regcache_sync(pdm->regmap);
+
+	pm_runtime_put(dev);
+
+	return ret;
+}
+#endif
+
+static const struct dev_pm_ops rockchip_pdm_pm_ops = {
+	SET_RUNTIME_PM_OPS(rockchip_pdm_runtime_suspend,
+			   rockchip_pdm_runtime_resume, NULL)
+	SET_SYSTEM_SLEEP_PM_OPS(rockchip_pdm_suspend, rockchip_pdm_resume)
+};
+
+static const struct of_device_id rockchip_pdm_match[] = {
+	{ .compatible = "rockchip,pdm", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, rockchip_pdm_match);
+
+static struct platform_driver rockchip_pdm_driver = {
+	.probe  = rockchip_pdm_probe,
+	.remove = rockchip_pdm_remove,
+	.driver = {
+		.name = "rockchip-pdm",
+		.of_match_table = of_match_ptr(rockchip_pdm_match),
+		.pm = &rockchip_pdm_pm_ops,
+	},
+};
+
+module_platform_driver(rockchip_pdm_driver);
+
+MODULE_AUTHOR("Sugar <sugar.zhang@...k-chips.com>");
+MODULE_DESCRIPTION("Rockchip PDM Controller Driver");
+MODULE_LICENSE("GPL v2");
diff --git a/sound/soc/rockchip/rockchip_pdm.h b/sound/soc/rockchip/rockchip_pdm.h
new file mode 100644
index 000000000000..886b48d128fd
--- /dev/null
+++ b/sound/soc/rockchip/rockchip_pdm.h
@@ -0,0 +1,83 @@
+/*
+ * Rockchip PDM ALSA SoC Digital Audio Interface(DAI)  driver
+ *
+ * Copyright (C) 2017 Fuzhou Rockchip Electronics Co., Ltd
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#ifndef _ROCKCHIP_PDM_H
+#define _ROCKCHIP_PDM_H
+
+/* PDM REGS */
+#define PDM_SYSCONFIG	(0x0000)
+#define PDM_CTRL0	(0x0004)
+#define PDM_CTRL1	(0x0008)
+#define PDM_CLK_CTRL	(0x000c)
+#define PDM_HPF_CTRL	(0x0010)
+#define PDM_FIFO_CTRL	(0x0014)
+#define PDM_DMA_CTRL	(0x0018)
+#define PDM_INT_EN	(0x001c)
+#define PDM_INT_CLR	(0x0020)
+#define PDM_INT_ST	(0x0024)
+#define PDM_RXFIFO_DATA	(0x0030)
+#define PDM_DATA_VALID	(0x0054)
+#define PDM_VERSION	(0x0058)
+
+/* PDM_SYSCONFIG */
+#define PDM_RX_MASK		(0x1 << 2)
+#define PDM_RX_START		(0x1 << 2)
+#define PDM_RX_STOP		(0x0 << 2)
+#define PDM_RX_CLR_MASK		(0x1 << 0)
+#define PDM_RX_CLR_WR		(0x1 << 0)
+#define PDM_RX_CLR_DONE		(0x0 << 0)
+
+/* PDM CTRL0 */
+#define PDM_PATH_MSK		(0xf << 27)
+#define PDM_PATH3_EN		BIT(30)
+#define PDM_PATH2_EN		BIT(29)
+#define PDM_PATH1_EN		BIT(28)
+#define PDM_PATH0_EN		BIT(27)
+#define PDM_HWT_EN		BIT(26)
+#define PDM_VDW_MSK		(0x1f << 0)
+#define PDM_VDW(X)		((X - 1) << 0)
+
+/* PDM CLK CTRL */
+#define PDM_CLK_MSK		BIT(5)
+#define PDM_CLK_EN		BIT(5)
+#define PDM_CLK_DIS		(0x0 << 5)
+#define PDM_CKP_MSK		BIT(3)
+#define PDM_CKP_NORMAL		(0x0 << 3)
+#define PDM_CKP_INVERTED	BIT(3)
+#define PDM_DS_RATIO_MSK	(0x7 << 0)
+#define PDM_CLK_320FS		(0x0 << 0)
+#define PDM_CLK_640FS		(0x1 << 0)
+#define PDM_CLK_1280FS		(0x2 << 0)
+#define PDM_CLK_2560FS		(0x3 << 0)
+#define PDM_CLK_5120FS		(0x4 << 0)
+
+/* PDM HPF CTRL */
+#define PDM_HPF_LE		BIT(3)
+#define PDM_HPF_RE		BIT(2)
+#define PDM_HPF_CF_MSK		(0x3 << 0)
+#define PDM_HPF_3P79HZ		(0x0 << 0)
+#define PDM_HPF_60HZ		(0x1 << 0)
+#define PDM_HPF_243HZ		(0x2 << 0)
+#define PDM_HPF_493HZ		(0x3 << 0)
+
+/* PDM DMA CTRL */
+#define PDM_DMA_RD_MSK		BIT(8)
+#define PDM_DMA_RD_EN		BIT(8)
+#define PDM_DMA_RD_DIS		(0x0 << 8)
+#define PDM_DMA_RDL_MSK		(0x7f << 0)
+#define PDM_DMA_RDL(X)		((X - 1) << 0)
+
+#endif /* _ROCKCHIP_PDM_H */
-- 
2.11.0

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