iio: adc: Add Renesas GyroADC driver
authorMarek Vasut <marek.vasut+renesas@gmail.com>
Fri, 27 Jan 2017 23:08:37 +0000 (00:08 +0100)
committerJonathan Cameron <jic23@kernel.org>
Sat, 28 Jan 2017 11:33:53 +0000 (11:33 +0000)
Add IIO driver for the Renesas RCar GyroADC block. This block is a
simple 4/8-channel ADC which samples 12/15/24 bits of data every
cycle from all channels.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Simon Horman <horms+renesas@verge.net.au>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: linux-renesas-soc@vger.kernel.org
Cc: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
MAINTAINERS
drivers/iio/adc/Kconfig
drivers/iio/adc/Makefile
drivers/iio/adc/rcar-gyroadc.c [new file with mode: 0644]

index 5f0420a0da5b674b314718fa5393201aa61815b7..89e0877e1399507be5f5b64323427c4eb35271c7 100644 (file)
@@ -10439,6 +10439,12 @@ L:     linux-renesas-soc@vger.kernel.org
 F:     drivers/net/ethernet/renesas/
 F:     include/linux/sh_eth.h
 
+RENESAS R-CAR GYROADC DRIVER
+M:     Marek Vasut <marek.vasut@gmail.com>
+L:     linux-iio@vger.kernel.org
+S:     Supported
+F:     drivers/iio/adc/rcar_gyro_adc.c
+
 RENESAS USB2 PHY DRIVER
 M:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
 L:     linux-renesas-soc@vger.kernel.org
index 1a73e03defac134cee6ac89fdcb8969fe6f6cbce..5f395d4983ed0a3b6146a212b0c88925bd0b6860 100644 (file)
@@ -458,6 +458,19 @@ config QCOM_SPMI_VADC
          To compile this driver as a module, choose M here: the module will
          be called qcom-spmi-vadc.
 
+config RCAR_GYRO_ADC
+       tristate "Renesas R-Car GyroADC driver"
+       depends on ARCH_RCAR_GEN2 || (ARM && COMPILE_TEST)
+       help
+         Say yes here to build support for the GyroADC found in Renesas
+         R-Car Gen2 SoCs. This block is a simple SPI offload engine for
+         reading data out of attached compatible ADCs in a round-robin
+         fashion. Up to 4 or 8 ADC channels are supported by this block,
+         depending on which ADCs are attached.
+
+         To compile this driver as a module, choose M here: the
+         module will be called rcar-gyroadc.
+
 config ROCKCHIP_SARADC
        tristate "Rockchip SARADC driver"
        depends on ARCH_ROCKCHIP || (ARM && COMPILE_TEST)
index 9475fd572e5bc3b8521eecf19ac5697fe935d9af..d27f8475712eab69b8f4894c535b7773627de991 100644 (file)
@@ -43,6 +43,7 @@ obj-$(CONFIG_NAU7802) += nau7802.o
 obj-$(CONFIG_PALMAS_GPADC) += palmas_gpadc.o
 obj-$(CONFIG_QCOM_SPMI_IADC) += qcom-spmi-iadc.o
 obj-$(CONFIG_QCOM_SPMI_VADC) += qcom-spmi-vadc.o
+obj-$(CONFIG_RCAR_GYRO_ADC) += rcar-gyroadc.o
 obj-$(CONFIG_ROCKCHIP_SARADC) += rockchip_saradc.o
 obj-$(CONFIG_STX104) += stx104.o
 obj-$(CONFIG_STM32_ADC_CORE) += stm32-adc-core.o
diff --git a/drivers/iio/adc/rcar-gyroadc.c b/drivers/iio/adc/rcar-gyroadc.c
new file mode 100644 (file)
index 0000000..0c44f72
--- /dev/null
@@ -0,0 +1,631 @@
+/*
+ * Renesas R-Car GyroADC driver
+ *
+ * Copyright 2016 Marek Vasut <marek.vasut@gmail.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.
+ *
+ * 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/platform_device.h>
+#include <linux/delay.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/clk.h>
+#include <linux/of.h>
+#include <linux/of_irq.h>
+#include <linux/regulator/consumer.h>
+#include <linux/of_platform.h>
+#include <linux/err.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+
+#define DRIVER_NAME                            "rcar-gyroadc"
+
+/* GyroADC registers. */
+#define RCAR_GYROADC_MODE_SELECT               0x00
+#define RCAR_GYROADC_MODE_SELECT_1_MB88101A    0x0
+#define RCAR_GYROADC_MODE_SELECT_2_ADCS7476    0x1
+#define RCAR_GYROADC_MODE_SELECT_3_MAX1162     0x3
+
+#define RCAR_GYROADC_START_STOP                        0x04
+#define RCAR_GYROADC_START_STOP_START          BIT(0)
+
+#define RCAR_GYROADC_CLOCK_LENGTH              0x08
+#define RCAR_GYROADC_1_25MS_LENGTH             0x0c
+
+#define RCAR_GYROADC_REALTIME_DATA(ch)         (0x10 + ((ch) * 4))
+#define RCAR_GYROADC_100MS_ADDED_DATA(ch)      (0x30 + ((ch) * 4))
+#define RCAR_GYROADC_10MS_AVG_DATA(ch)         (0x50 + ((ch) * 4))
+
+#define RCAR_GYROADC_FIFO_STATUS               0x70
+#define RCAR_GYROADC_FIFO_STATUS_EMPTY(ch)     BIT(0 + (4 * (ch)))
+#define RCAR_GYROADC_FIFO_STATUS_FULL(ch)      BIT(1 + (4 * (ch)))
+#define RCAR_GYROADC_FIFO_STATUS_ERROR(ch)     BIT(2 + (4 * (ch)))
+
+#define RCAR_GYROADC_INTR                      0x74
+#define RCAR_GYROADC_INTR_INT                  BIT(0)
+
+#define RCAR_GYROADC_INTENR                    0x78
+#define RCAR_GYROADC_INTENR_INTEN              BIT(0)
+
+#define RCAR_GYROADC_SAMPLE_RATE               800     /* Hz */
+
+#define RCAR_GYROADC_RUNTIME_PM_DELAY_MS       2000
+
+enum rcar_gyroadc_model {
+       RCAR_GYROADC_MODEL_DEFAULT,
+       RCAR_GYROADC_MODEL_R8A7792,
+};
+
+struct rcar_gyroadc {
+       struct device                   *dev;
+       void __iomem                    *regs;
+       struct clk                      *iclk;
+       struct regulator                *vref[8];
+       unsigned int                    num_channels;
+       enum rcar_gyroadc_model         model;
+       unsigned int                    mode;
+       unsigned int                    sample_width;
+};
+
+static void rcar_gyroadc_hw_init(struct rcar_gyroadc *priv)
+{
+       const unsigned long clk_mhz = clk_get_rate(priv->iclk) / 1000000;
+       const unsigned long clk_mul =
+               (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) ? 10 : 5;
+       unsigned long clk_len = clk_mhz * clk_mul;
+
+       /*
+        * According to the R-Car Gen2 datasheet Rev. 1.01, Sept 08 2014,
+        * page 77-7, clock length must be even number. If it's odd number,
+        * add one.
+        */
+       if (clk_len & 1)
+               clk_len++;
+
+       /* Stop the GyroADC. */
+       writel(0, priv->regs + RCAR_GYROADC_START_STOP);
+
+       /* Disable IRQ on V2H. */
+       if (priv->model == RCAR_GYROADC_MODEL_R8A7792)
+               writel(0, priv->regs + RCAR_GYROADC_INTENR);
+
+       /* Set mode and timing. */
+       writel(priv->mode, priv->regs + RCAR_GYROADC_MODE_SELECT);
+       writel(clk_len, priv->regs + RCAR_GYROADC_CLOCK_LENGTH);
+       writel(clk_mhz * 1250, priv->regs + RCAR_GYROADC_1_25MS_LENGTH);
+}
+
+static void rcar_gyroadc_hw_start(struct rcar_gyroadc *priv)
+{
+       /* Start sampling. */
+       writel(RCAR_GYROADC_START_STOP_START,
+              priv->regs + RCAR_GYROADC_START_STOP);
+
+       /*
+        * Wait for the first conversion to complete. This is longer than
+        * the 1.25 mS in the datasheet because 1.25 mS is not enough for
+        * the hardware to deliver the first sample and the hardware does
+        * then return zeroes instead of valid data.
+        */
+       mdelay(3);
+}
+
+static void rcar_gyroadc_hw_stop(struct rcar_gyroadc *priv)
+{
+       /* Stop the GyroADC. */
+       writel(0, priv->regs + RCAR_GYROADC_START_STOP);
+}
+
+#define RCAR_GYROADC_CHAN(_idx) {                              \
+       .type                   = IIO_VOLTAGE,                  \
+       .indexed                = 1,                            \
+       .channel                = (_idx),                       \
+       .info_mask_separate     = BIT(IIO_CHAN_INFO_RAW) |      \
+                                 BIT(IIO_CHAN_INFO_SCALE),     \
+       .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+}
+
+static const struct iio_chan_spec rcar_gyroadc_iio_channels_1[] = {
+       RCAR_GYROADC_CHAN(0),
+       RCAR_GYROADC_CHAN(1),
+       RCAR_GYROADC_CHAN(2),
+       RCAR_GYROADC_CHAN(3),
+};
+
+static const struct iio_chan_spec rcar_gyroadc_iio_channels_2[] = {
+       RCAR_GYROADC_CHAN(0),
+       RCAR_GYROADC_CHAN(1),
+       RCAR_GYROADC_CHAN(2),
+       RCAR_GYROADC_CHAN(3),
+       RCAR_GYROADC_CHAN(4),
+       RCAR_GYROADC_CHAN(5),
+       RCAR_GYROADC_CHAN(6),
+       RCAR_GYROADC_CHAN(7),
+};
+
+static const struct iio_chan_spec rcar_gyroadc_iio_channels_3[] = {
+       RCAR_GYROADC_CHAN(0),
+       RCAR_GYROADC_CHAN(1),
+       RCAR_GYROADC_CHAN(2),
+       RCAR_GYROADC_CHAN(3),
+       RCAR_GYROADC_CHAN(4),
+       RCAR_GYROADC_CHAN(5),
+       RCAR_GYROADC_CHAN(6),
+       RCAR_GYROADC_CHAN(7),
+};
+
+static int rcar_gyroadc_set_power(struct rcar_gyroadc *priv, bool on)
+{
+       struct device *dev = priv->dev;
+       int ret;
+
+       if (on) {
+               ret = pm_runtime_get_sync(dev);
+               if (ret < 0)
+                       pm_runtime_put_noidle(dev);
+       } else {
+               pm_runtime_mark_last_busy(dev);
+               ret = pm_runtime_put_autosuspend(dev);
+       }
+
+       return ret;
+}
+
+static int rcar_gyroadc_read_raw(struct iio_dev *indio_dev,
+                                struct iio_chan_spec const *chan,
+                                int *val, int *val2, long mask)
+{
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+       struct regulator *consumer;
+       unsigned int datareg = RCAR_GYROADC_REALTIME_DATA(chan->channel);
+       unsigned int vref;
+       int ret;
+
+       /*
+        * MB88101 is special in that it has only single regulator for
+        * all four channels.
+        */
+       if (priv->mode == RCAR_GYROADC_MODE_SELECT_1_MB88101A)
+               consumer = priv->vref[0];
+       else
+               consumer = priv->vref[chan->channel];
+
+       switch (mask) {
+       case IIO_CHAN_INFO_RAW:
+               if (chan->type != IIO_VOLTAGE)
+                       return -EINVAL;
+
+               /* Channel not connected. */
+               if (!consumer)
+                       return -EINVAL;
+
+               ret = iio_device_claim_direct_mode(indio_dev);
+               if (ret)
+                       return ret;
+
+               ret = rcar_gyroadc_set_power(priv, true);
+               if (ret < 0) {
+                       iio_device_release_direct_mode(indio_dev);
+                       return ret;
+               }
+
+               *val = readl(priv->regs + datareg);
+               *val &= BIT(priv->sample_width) - 1;
+
+               ret = rcar_gyroadc_set_power(priv, false);
+               iio_device_release_direct_mode(indio_dev);
+               if (ret < 0)
+                       return ret;
+
+               return IIO_VAL_INT;
+       case IIO_CHAN_INFO_SCALE:
+               /* Channel not connected. */
+               if (!consumer)
+                       return -EINVAL;
+
+               vref = regulator_get_voltage(consumer);
+               *val = vref / 1000;
+               *val2 = 1 << priv->sample_width;
+
+               return IIO_VAL_FRACTIONAL;
+       case IIO_CHAN_INFO_SAMP_FREQ:
+               *val = RCAR_GYROADC_SAMPLE_RATE;
+
+               return IIO_VAL_INT;
+       default:
+               return -EINVAL;
+       }
+}
+
+static int rcar_gyroadc_reg_access(struct iio_dev *indio_dev,
+                                  unsigned int reg, unsigned int writeval,
+                                  unsigned int *readval)
+{
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+       unsigned int maxreg = RCAR_GYROADC_FIFO_STATUS;
+
+       if (readval == NULL)
+               return -EINVAL;
+
+       if (reg % 4)
+               return -EINVAL;
+
+       /* Handle the V2H case with extra interrupt block. */
+       if (priv->model == RCAR_GYROADC_MODEL_R8A7792)
+               maxreg = RCAR_GYROADC_INTENR;
+
+       if (reg > maxreg)
+               return -EINVAL;
+
+       *readval = readl(priv->regs + reg);
+
+       return 0;
+}
+
+static const struct iio_info rcar_gyroadc_iio_info = {
+       .driver_module          = THIS_MODULE,
+       .read_raw               = rcar_gyroadc_read_raw,
+       .debugfs_reg_access     = rcar_gyroadc_reg_access,
+};
+
+static const struct of_device_id rcar_gyroadc_match[] = {
+       {
+               /* R-Car compatible GyroADC */
+               .compatible     = "renesas,rcar-gyroadc",
+               .data           = (void *)RCAR_GYROADC_MODEL_DEFAULT,
+       }, {
+               /* R-Car V2H specialty with interrupt registers. */
+               .compatible     = "renesas,r8a7792-gyroadc",
+               .data           = (void *)RCAR_GYROADC_MODEL_R8A7792,
+       }, {
+               /* sentinel */
+       }
+};
+
+MODULE_DEVICE_TABLE(of, rcar_gyroadc_match);
+
+static const struct of_device_id rcar_gyroadc_child_match[] = {
+       /* Mode 1 ADCs */
+       {
+               .compatible     = "fujitsu,mb88101a",
+               .data           = (void *)RCAR_GYROADC_MODE_SELECT_1_MB88101A,
+       },
+       /* Mode 2 ADCs */
+       {
+               .compatible     = "ti,adcs7476",
+               .data           = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476,
+       }, {
+               .compatible     = "ti,adc121",
+               .data           = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476,
+       }, {
+               .compatible     = "adi,ad7476",
+               .data           = (void *)RCAR_GYROADC_MODE_SELECT_2_ADCS7476,
+       },
+       /* Mode 3 ADCs */
+       {
+               .compatible     = "maxim,max1162",
+               .data           = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162,
+       }, {
+               .compatible     = "maxim,max11100",
+               .data           = (void *)RCAR_GYROADC_MODE_SELECT_3_MAX1162,
+       },
+       { /* sentinel */ }
+};
+
+static int rcar_gyroadc_parse_subdevs(struct iio_dev *indio_dev)
+{
+       const struct of_device_id *of_id;
+       const struct iio_chan_spec *channels;
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+       struct device *dev = priv->dev;
+       struct device_node *np = dev->of_node;
+       struct device_node *child;
+       struct regulator *vref;
+       unsigned int reg;
+       unsigned int adcmode, childmode;
+       unsigned int sample_width;
+       unsigned int num_channels;
+       int ret, first = 1;
+
+       for_each_child_of_node(np, child) {
+               of_id = of_match_node(rcar_gyroadc_child_match, child);
+               if (!of_id) {
+                       dev_err(dev, "Ignoring unsupported ADC \"%s\".",
+                               child->name);
+                       continue;
+               }
+
+               childmode = (unsigned int)of_id->data;
+               switch (childmode) {
+               case RCAR_GYROADC_MODE_SELECT_1_MB88101A:
+                       sample_width = 12;
+                       channels = rcar_gyroadc_iio_channels_1;
+                       num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_1);
+                       break;
+               case RCAR_GYROADC_MODE_SELECT_2_ADCS7476:
+                       sample_width = 15;
+                       channels = rcar_gyroadc_iio_channels_2;
+                       num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_2);
+                       break;
+               case RCAR_GYROADC_MODE_SELECT_3_MAX1162:
+                       sample_width = 16;
+                       channels = rcar_gyroadc_iio_channels_3;
+                       num_channels = ARRAY_SIZE(rcar_gyroadc_iio_channels_3);
+                       break;
+               }
+
+               /*
+                * MB88101 is special in that it's only a single chip taking
+                * up all the CHS lines. Thus, the DT binding is also special
+                * and has no reg property. If we run into such ADC, handle
+                * it here.
+                */
+               if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A) {
+                       reg = 0;
+               } else {
+                       ret = of_property_read_u32(child, "reg", &reg);
+                       if (ret) {
+                               dev_err(dev,
+                                       "Failed to get child reg property of ADC \"%s\".\n",
+                                       child->name);
+                               return ret;
+                       }
+
+                       /* Channel number is too high. */
+                       if (reg >= num_channels) {
+                               dev_err(dev,
+                                       "Only %i channels supported with %s, but reg = <%i>.\n",
+                                       num_channels, child->name, reg);
+                               return ret;
+                       }
+               }
+
+               /* Child node selected different mode than the rest. */
+               if (!first && (adcmode != childmode)) {
+                       dev_err(dev,
+                               "Channel %i uses different ADC mode than the rest.\n",
+                               reg);
+                       return ret;
+               }
+
+               /* Channel is valid, grab the regulator. */
+               dev->of_node = child;
+               vref = devm_regulator_get(dev, "vref");
+               dev->of_node = np;
+               if (IS_ERR(vref)) {
+                       dev_dbg(dev, "Channel %i 'vref' supply not connected.\n",
+                               reg);
+                       return PTR_ERR(vref);
+               }
+
+               priv->vref[reg] = vref;
+
+               if (!first)
+                       continue;
+
+               /* First child node which passed sanity tests. */
+               adcmode = childmode;
+               first = 0;
+
+               priv->num_channels = num_channels;
+               priv->mode = childmode;
+               priv->sample_width = sample_width;
+
+               indio_dev->channels = channels;
+               indio_dev->num_channels = num_channels;
+
+               /*
+                * MB88101 is special and we only have one such device
+                * attached to the GyroADC at a time, so if we found it,
+                * we can stop parsing here.
+                */
+               if (childmode == RCAR_GYROADC_MODE_SELECT_1_MB88101A)
+                       break;
+       }
+
+       if (first) {
+               dev_err(dev, "No valid ADC channels found, aborting.\n");
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+static void rcar_gyroadc_deinit_supplies(struct iio_dev *indio_dev)
+{
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+       unsigned int i;
+
+       for (i = 0; i < priv->num_channels; i++) {
+               if (!priv->vref[i])
+                       continue;
+
+               regulator_disable(priv->vref[i]);
+       }
+}
+
+static int rcar_gyroadc_init_supplies(struct iio_dev *indio_dev)
+{
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+       struct device *dev = priv->dev;
+       unsigned int i;
+       int ret;
+
+       for (i = 0; i < priv->num_channels; i++) {
+               if (!priv->vref[i])
+                       continue;
+
+               ret = regulator_enable(priv->vref[i]);
+               if (ret) {
+                       dev_err(dev, "Failed to enable regulator %i (ret=%i)\n",
+                               i, ret);
+                       goto err;
+               }
+       }
+
+       return 0;
+
+err:
+       rcar_gyroadc_deinit_supplies(indio_dev);
+       return ret;
+}
+
+static int rcar_gyroadc_probe(struct platform_device *pdev)
+{
+       const struct of_device_id *of_id =
+               of_match_device(rcar_gyroadc_match, &pdev->dev);
+       struct device *dev = &pdev->dev;
+       struct rcar_gyroadc *priv;
+       struct iio_dev *indio_dev;
+       struct resource *mem;
+       int ret;
+
+       indio_dev = devm_iio_device_alloc(dev, sizeof(*priv));
+       if (!indio_dev) {
+               dev_err(dev, "Failed to allocate IIO device.\n");
+               return -ENOMEM;
+       }
+
+       priv = iio_priv(indio_dev);
+       priv->dev = dev;
+
+       mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       priv->regs = devm_ioremap_resource(dev, mem);
+       if (IS_ERR(priv->regs))
+               return PTR_ERR(priv->regs);
+
+       priv->iclk = devm_clk_get(dev, "if");
+       if (IS_ERR(priv->iclk)) {
+               ret = PTR_ERR(priv->iclk);
+               if (ret != -EPROBE_DEFER)
+                       dev_err(dev, "Failed to get IF clock (ret=%i)\n", ret);
+               return ret;
+       }
+
+       ret = rcar_gyroadc_parse_subdevs(indio_dev);
+       if (ret)
+               return ret;
+
+       ret = rcar_gyroadc_init_supplies(indio_dev);
+       if (ret)
+               return ret;
+
+       priv->model = (enum rcar_gyroadc_model)of_id->data;
+
+       platform_set_drvdata(pdev, indio_dev);
+
+       indio_dev->name = DRIVER_NAME;
+       indio_dev->dev.parent = dev;
+       indio_dev->dev.of_node = pdev->dev.of_node;
+       indio_dev->info = &rcar_gyroadc_iio_info;
+       indio_dev->modes = INDIO_DIRECT_MODE;
+
+       ret = clk_prepare_enable(priv->iclk);
+       if (ret) {
+               dev_err(dev, "Could not prepare or enable the IF clock.\n");
+               goto err_clk_if_enable;
+       }
+
+       pm_runtime_set_autosuspend_delay(dev, RCAR_GYROADC_RUNTIME_PM_DELAY_MS);
+       pm_runtime_use_autosuspend(dev);
+       pm_runtime_enable(dev);
+
+       pm_runtime_get_sync(dev);
+       rcar_gyroadc_hw_init(priv);
+       rcar_gyroadc_hw_start(priv);
+
+       ret = iio_device_register(indio_dev);
+       if (ret) {
+               dev_err(dev, "Couldn't register IIO device.\n");
+               goto err_iio_device_register;
+       }
+
+       pm_runtime_put_sync(dev);
+
+       return 0;
+
+err_iio_device_register:
+       rcar_gyroadc_hw_stop(priv);
+       pm_runtime_put_sync(dev);
+       pm_runtime_disable(dev);
+       pm_runtime_set_suspended(dev);
+       clk_disable_unprepare(priv->iclk);
+err_clk_if_enable:
+       rcar_gyroadc_deinit_supplies(indio_dev);
+
+       return ret;
+}
+
+static int rcar_gyroadc_remove(struct platform_device *pdev)
+{
+       struct iio_dev *indio_dev = platform_get_drvdata(pdev);
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+       struct device *dev = priv->dev;
+
+       iio_device_unregister(indio_dev);
+       pm_runtime_get_sync(dev);
+       rcar_gyroadc_hw_stop(priv);
+       pm_runtime_put_sync(dev);
+       pm_runtime_disable(dev);
+       pm_runtime_set_suspended(dev);
+       clk_disable_unprepare(priv->iclk);
+       rcar_gyroadc_deinit_supplies(indio_dev);
+
+       return 0;
+}
+
+#if defined(CONFIG_PM)
+static int rcar_gyroadc_suspend(struct device *dev)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+
+       rcar_gyroadc_hw_stop(priv);
+
+       return 0;
+}
+
+static int rcar_gyroadc_resume(struct device *dev)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct rcar_gyroadc *priv = iio_priv(indio_dev);
+
+       rcar_gyroadc_hw_start(priv);
+
+       return 0;
+}
+#endif
+
+static const struct dev_pm_ops rcar_gyroadc_pm_ops = {
+       SET_RUNTIME_PM_OPS(rcar_gyroadc_suspend, rcar_gyroadc_resume, NULL)
+};
+
+static struct platform_driver rcar_gyroadc_driver = {
+       .probe          = rcar_gyroadc_probe,
+       .remove         = rcar_gyroadc_remove,
+       .driver         = {
+               .name           = DRIVER_NAME,
+               .of_match_table = rcar_gyroadc_match,
+               .pm             = &rcar_gyroadc_pm_ops,
+       },
+};
+
+module_platform_driver(rcar_gyroadc_driver);
+
+MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
+MODULE_DESCRIPTION("Renesas R-Car GyroADC driver");
+MODULE_LICENSE("GPL");