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Date:   Fri, 22 Jun 2018 18:06:59 +0100
From:   Jonathan Cameron <jonathan.cameron@huawei.com>
To:     William Breathitt Gray <vilhelm.gray@gmail.com>
CC:     <gregkh@linuxfoundation.org>, <jic23@kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <linux-iio@vger.kernel.org>, <fabrice.gasnier@st.com>,
        <benjamin.gaignard@st.com>, <robh+dt@kernel.org>,
        <knaack.h@gmx.de>, <lars@metafoo.de>, <pmeerw@pmeerw.net>,
        <mark.rutland@arm.com>
Subject: Re: [PATCH v7 08/10] counter: stm32-lptimer: add counter device
Message-ID: <20180622180659.00002de8@huawei.com>
In-Reply-To: <e7a693fc6d716f8f948737be23375c8c92be3590.1529607879.git.vilhelm.gray@gmail.com>
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        <e7a693fc6d716f8f948737be23375c8c92be3590.1529607879.git.vilhelm.gray@gmail.com>
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On Thu, 21 Jun 2018 17:08:46 -0400
William Breathitt Gray <vilhelm.gray@gmail.com> wrote:

> From: Fabrice Gasnier <fabrice.gasnier@st.com>
> 
> Add support for new counter device to stm32-lptimer.
> 
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

> ---
>  drivers/counter/Kconfig                       |  10 +
>  drivers/counter/Makefile                      |   1 +
>  drivers/{iio => }/counter/stm32-lptimer-cnt.c | 361 ++++++++++++++++--
>  drivers/iio/Kconfig                           |   1 -
>  drivers/iio/Makefile                          |   1 -
>  drivers/iio/counter/Kconfig                   |  17 -
>  drivers/iio/counter/Makefile                  |   7 -
>  7 files changed, 350 insertions(+), 48 deletions(-)
>  rename drivers/{iio => }/counter/stm32-lptimer-cnt.c (48%)
>  delete mode 100644 drivers/iio/counter/Kconfig
>  delete mode 100644 drivers/iio/counter/Makefile
> 
> diff --git a/drivers/counter/Kconfig b/drivers/counter/Kconfig
> index fcfbaa935122..fc072b97e5d2 100644
> --- a/drivers/counter/Kconfig
> +++ b/drivers/counter/Kconfig
> @@ -46,4 +46,14 @@ config STM32_TIMER_CNT
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called stm32-timer-cnt.
>  
> +config STM32_LPTIMER_CNT
> +	tristate "STM32 LP Timer encoder counter driver"
> +	depends on (MFD_STM32_LPTIMER || COMPILE_TEST) && IIO
> +	help
> +	  Select this option to enable STM32 Low-Power Timer quadrature encoder
> +	  and counter driver.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called stm32-lptimer-cnt.
> +
>  endif # COUNTER
> diff --git a/drivers/counter/Makefile b/drivers/counter/Makefile
> index ff024259fb46..8ff19b32022b 100644
> --- a/drivers/counter/Makefile
> +++ b/drivers/counter/Makefile
> @@ -9,3 +9,4 @@ counter-y := generic-counter.o
>  
>  obj-$(CONFIG_104_QUAD_8)	+= 104-quad-8.o
>  obj-$(CONFIG_STM32_TIMER_CNT)	+= stm32-timer-cnt.o
> +obj-$(CONFIG_STM32_LPTIMER_CNT)	+= stm32-lptimer-cnt.o
> diff --git a/drivers/iio/counter/stm32-lptimer-cnt.c b/drivers/counter/stm32-lptimer-cnt.c
> similarity index 48%
> rename from drivers/iio/counter/stm32-lptimer-cnt.c
> rename to drivers/counter/stm32-lptimer-cnt.c
> index 42fb8ba67090..80fc883f84e7 100644
> --- a/drivers/iio/counter/stm32-lptimer-cnt.c
> +++ b/drivers/counter/stm32-lptimer-cnt.c
> @@ -11,16 +11,18 @@
>   */
>  
>  #include <linux/bitfield.h>
> +#include <linux/counter.h>
>  #include <linux/iio/iio.h>
>  #include <linux/mfd/stm32-lptimer.h>
>  #include <linux/module.h>
>  #include <linux/platform_device.h>
>  
>  struct stm32_lptim_cnt {
> +	struct counter_device counter;
>  	struct device *dev;
>  	struct regmap *regmap;
>  	struct clk *clk;
> -	u32 preset;
> +	u32 ceiling;
>  	u32 polarity;
>  	u32 quadrature_mode;
>  };
> @@ -54,7 +56,7 @@ static int stm32_lptim_set_enable_state(struct stm32_lptim_cnt *priv,
>  	}
>  
>  	/* LP timer must be enabled before writing CMP & ARR */
> -	ret = regmap_write(priv->regmap, STM32_LPTIM_ARR, priv->preset);
> +	ret = regmap_write(priv->regmap, STM32_LPTIM_ARR, priv->ceiling);
>  	if (ret)
>  		return ret;
>  
> @@ -247,44 +249,57 @@ static const struct iio_enum stm32_lptim_cnt_polarity_en = {
>  	.set = stm32_lptim_cnt_set_polarity,
>  };
>  
> -static ssize_t stm32_lptim_cnt_get_preset(struct iio_dev *indio_dev,
> -					  uintptr_t private,
> -					  const struct iio_chan_spec *chan,
> -					  char *buf)
> +static ssize_t stm32_lptim_cnt_get_ceiling(struct stm32_lptim_cnt *priv,
> +					   char *buf)
>  {
> -	struct stm32_lptim_cnt *priv = iio_priv(indio_dev);
> -
> -	return snprintf(buf, PAGE_SIZE, "%u\n", priv->preset);
> +	return snprintf(buf, PAGE_SIZE, "%u\n", priv->ceiling);
>  }
>  
> -static ssize_t stm32_lptim_cnt_set_preset(struct iio_dev *indio_dev,
> -					  uintptr_t private,
> -					  const struct iio_chan_spec *chan,
> -					  const char *buf, size_t len)
> +static ssize_t stm32_lptim_cnt_set_ceiling(struct stm32_lptim_cnt *priv,
> +					   const char *buf, size_t len)
>  {
> -	struct stm32_lptim_cnt *priv = iio_priv(indio_dev);
>  	int ret;
>  
>  	if (stm32_lptim_is_enabled(priv))
>  		return -EBUSY;
>  
> -	ret = kstrtouint(buf, 0, &priv->preset);
> +	ret = kstrtouint(buf, 0, &priv->ceiling);
>  	if (ret)
>  		return ret;
>  
> -	if (priv->preset > STM32_LPTIM_MAX_ARR)
> +	if (priv->ceiling > STM32_LPTIM_MAX_ARR)
>  		return -EINVAL;
>  
>  	return len;
>  }
>  
> +static ssize_t stm32_lptim_cnt_get_preset_iio(struct iio_dev *indio_dev,
> +					      uintptr_t private,
> +					      const struct iio_chan_spec *chan,
> +					      char *buf)
> +{
> +	struct stm32_lptim_cnt *priv = iio_priv(indio_dev);
> +
> +	return stm32_lptim_cnt_get_ceiling(priv, buf);
> +}
> +
> +static ssize_t stm32_lptim_cnt_set_preset_iio(struct iio_dev *indio_dev,
> +					      uintptr_t private,
> +					      const struct iio_chan_spec *chan,
> +					      const char *buf, size_t len)
> +{
> +	struct stm32_lptim_cnt *priv = iio_priv(indio_dev);
> +
> +	return stm32_lptim_cnt_set_ceiling(priv, buf, len);
> +}
> +
>  /* LP timer with encoder */
>  static const struct iio_chan_spec_ext_info stm32_lptim_enc_ext_info[] = {
>  	{
>  		.name = "preset",
>  		.shared = IIO_SEPARATE,
> -		.read = stm32_lptim_cnt_get_preset,
> -		.write = stm32_lptim_cnt_set_preset,
> +		.read = stm32_lptim_cnt_get_preset_iio,
> +		.write = stm32_lptim_cnt_set_preset_iio,
>  	},
>  	IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en),
>  	IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en),
> @@ -309,8 +324,8 @@ static const struct iio_chan_spec_ext_info stm32_lptim_cnt_ext_info[] = {
>  	{
>  		.name = "preset",
>  		.shared = IIO_SEPARATE,
> -		.read = stm32_lptim_cnt_get_preset,
> -		.write = stm32_lptim_cnt_set_preset,
> +		.read = stm32_lptim_cnt_get_preset_iio,
> +		.write = stm32_lptim_cnt_set_preset_iio,
>  	},
>  	IIO_ENUM("polarity", IIO_SEPARATE, &stm32_lptim_cnt_polarity_en),
>  	IIO_ENUM_AVAILABLE("polarity", &stm32_lptim_cnt_polarity_en),
> @@ -327,11 +342,293 @@ static const struct iio_chan_spec stm32_lptim_cnt_channels = {
>  	.indexed = 1,
>  };
>  
> +/**
> + * stm32_lptim_cnt_function - enumerates stm32 LPTimer counter & encoder modes
> + * @STM32_LPTIM_COUNTER_INCREASE: up count on IN1 rising, falling or both edges
> + * @STM32_LPTIM_ENCODER_BOTH_EDGE: count on both edges (IN1 & IN2 quadrature)
> + */
> +enum stm32_lptim_cnt_function {
> +	STM32_LPTIM_COUNTER_INCREASE,
> +	STM32_LPTIM_ENCODER_BOTH_EDGE,
> +};
> +
> +static enum count_function stm32_lptim_cnt_functions[] = {
> +	[STM32_LPTIM_COUNTER_INCREASE] = COUNT_FUNCTION_INCREASE,
> +	[STM32_LPTIM_ENCODER_BOTH_EDGE] = COUNT_FUNCTION_QUADRATURE_X4,
> +};
> +
> +enum stm32_lptim_synapse_action {
> +	STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE,
> +	STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE,
> +	STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES,
> +	STM32_LPTIM_SYNAPSE_ACTION_NONE,
> +};
> +
> +static enum synapse_action stm32_lptim_cnt_synapse_actions[] = {
> +	/* Index must match with stm32_lptim_cnt_polarity[] (priv->polarity) */
> +	[STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE] = SYNAPSE_ACTION_RISING_EDGE,
> +	[STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE] = SYNAPSE_ACTION_FALLING_EDGE,
> +	[STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES] = SYNAPSE_ACTION_BOTH_EDGES,
> +	[STM32_LPTIM_SYNAPSE_ACTION_NONE] = SYNAPSE_ACTION_NONE,
> +};
> +
> +static int stm32_lptim_cnt_read(struct counter_device *counter,
> +				struct counter_count *count,
> +				struct count_read_value *val)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +	u32 cnt;
> +	int ret;
> +
> +	ret = regmap_read(priv->regmap, STM32_LPTIM_CNT, &cnt);
> +	if (ret)
> +		return ret;
> +
> +	count_read_value_set(val, COUNT_POSITION, &cnt);
> +
> +	return 0;
> +}
> +
> +static int stm32_lptim_cnt_function_get(struct counter_device *counter,
> +					struct counter_count *count,
> +					size_t *function)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +
> +	if (!priv->quadrature_mode) {
> +		*function = STM32_LPTIM_COUNTER_INCREASE;
> +		return 0;
> +	}
> +
> +	if (priv->polarity == STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES) {
> +		*function = STM32_LPTIM_ENCODER_BOTH_EDGE;
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int stm32_lptim_cnt_function_set(struct counter_device *counter,
> +					struct counter_count *count,
> +					size_t function)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +
> +	if (stm32_lptim_is_enabled(priv))
> +		return -EBUSY;
> +
> +	switch (function) {
> +	case STM32_LPTIM_COUNTER_INCREASE:
> +		priv->quadrature_mode = 0;
> +		return 0;
> +	case STM32_LPTIM_ENCODER_BOTH_EDGE:
> +		priv->quadrature_mode = 1;
> +		priv->polarity = STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES;
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static ssize_t stm32_lptim_cnt_enable_read(struct counter_device *counter,
> +					   struct counter_count *count,
> +					   void *private, char *buf)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +	int ret;
> +
> +	ret = stm32_lptim_is_enabled(priv);
> +	if (ret < 0)
> +		return ret;
> +
> +	return scnprintf(buf, PAGE_SIZE, "%u\n", ret);
> +}
> +
> +static ssize_t stm32_lptim_cnt_enable_write(struct counter_device *counter,
> +					    struct counter_count *count,
> +					    void *private,
> +					    const char *buf, size_t len)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +	bool enable;
> +	int ret;
> +
> +	ret = kstrtobool(buf, &enable);
> +	if (ret)
> +		return ret;
> +
> +	/* Check nobody uses the timer, or already disabled/enabled */
> +	ret = stm32_lptim_is_enabled(priv);
> +	if ((ret < 0) || (!ret && !enable))
> +		return ret;
> +	if (enable && ret)
> +		return -EBUSY;
> +
> +	ret = stm32_lptim_setup(priv, enable);
> +	if (ret)
> +		return ret;
> +
> +	ret = stm32_lptim_set_enable_state(priv, enable);
> +	if (ret)
> +		return ret;
> +
> +	return len;
> +}
> +
> +static ssize_t stm32_lptim_cnt_ceiling_read(struct counter_device *counter,
> +					    struct counter_count *count,
> +					    void *private, char *buf)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +
> +	return stm32_lptim_cnt_get_ceiling(priv, buf);
> +}
> +
> +static ssize_t stm32_lptim_cnt_ceiling_write(struct counter_device *counter,
> +					     struct counter_count *count,
> +					     void *private,
> +					     const char *buf, size_t len)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +
> +	return stm32_lptim_cnt_set_ceiling(priv, buf, len);
> +}
> +
> +static const struct counter_count_ext stm32_lptim_cnt_ext[] = {
> +	{
> +		.name = "enable",
> +		.read = stm32_lptim_cnt_enable_read,
> +		.write = stm32_lptim_cnt_enable_write
> +	},
> +	{
> +		.name = "ceiling",
> +		.read = stm32_lptim_cnt_ceiling_read,
> +		.write = stm32_lptim_cnt_ceiling_write
> +	},
> +};
> +
> +static int stm32_lptim_cnt_action_get(struct counter_device *counter,
> +				      struct counter_count *count,
> +				      struct counter_synapse *synapse,
> +				      size_t *action)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +	size_t function;
> +	int err;
> +
> +	err = stm32_lptim_cnt_function_get(counter, count, &function);
> +	if (err)
> +		return err;
> +
> +	switch (function) {
> +	case STM32_LPTIM_COUNTER_INCREASE:
> +		/* LP Timer acts as up-counter on input 1 */
> +		if (synapse->signal->id == count->synapses[0].signal->id)
> +			*action = priv->polarity;
> +		else
> +			*action = STM32_LPTIM_SYNAPSE_ACTION_NONE;
> +		return 0;
> +	case STM32_LPTIM_ENCODER_BOTH_EDGE:
> +		*action = priv->polarity;
> +		return 0;
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static int stm32_lptim_cnt_action_set(struct counter_device *counter,
> +				      struct counter_count *count,
> +				      struct counter_synapse *synapse,
> +				      size_t action)
> +{
> +	struct stm32_lptim_cnt *const priv = counter->priv;
> +	size_t function;
> +	int err;
> +
> +	if (stm32_lptim_is_enabled(priv))
> +		return -EBUSY;
> +
> +	err = stm32_lptim_cnt_function_get(counter, count, &function);
> +	if (err)
> +		return err;
> +
> +	/* only set polarity when in counter mode (on input 1) */
> +	if (function == STM32_LPTIM_COUNTER_INCREASE
> +	    && synapse->signal->id == count->synapses[0].signal->id) {
> +		switch (action) {
> +		case STM32_LPTIM_SYNAPSE_ACTION_RISING_EDGE:
> +		case STM32_LPTIM_SYNAPSE_ACTION_FALLING_EDGE:
> +		case STM32_LPTIM_SYNAPSE_ACTION_BOTH_EDGES:
> +			priv->polarity = action;
> +			return 0;
> +		}
> +	}
> +
> +	return -EINVAL;
> +}
> +
> +static const struct counter_ops stm32_lptim_cnt_ops = {
> +	.count_read = stm32_lptim_cnt_read,
> +	.function_get = stm32_lptim_cnt_function_get,
> +	.function_set = stm32_lptim_cnt_function_set,
> +	.action_get = stm32_lptim_cnt_action_get,
> +	.action_set = stm32_lptim_cnt_action_set,
> +};
> +
> +static struct counter_signal stm32_lptim_cnt_signals[] = {
> +	{
> +		.id = 0,
> +		.name = "Channel 1 Quadrature A"
> +	},
> +	{
> +		.id = 1,
> +		.name = "Channel 1 Quadrature B"
> +	}
> +};
> +
> +static struct counter_synapse stm32_lptim_cnt_synapses[] = {
> +	{
> +		.actions_list = stm32_lptim_cnt_synapse_actions,
> +		.num_actions = ARRAY_SIZE(stm32_lptim_cnt_synapse_actions),
> +		.signal = &stm32_lptim_cnt_signals[0]
> +	},
> +	{
> +		.actions_list = stm32_lptim_cnt_synapse_actions,
> +		.num_actions = ARRAY_SIZE(stm32_lptim_cnt_synapse_actions),
> +		.signal = &stm32_lptim_cnt_signals[1]
> +	}
> +};
> +
> +/* LP timer with encoder */
> +static struct counter_count stm32_lptim_enc_counts = {
> +	.id = 0,
> +	.name = "LPTimer Count",
> +	.functions_list = stm32_lptim_cnt_functions,
> +	.num_functions = ARRAY_SIZE(stm32_lptim_cnt_functions),
> +	.synapses = stm32_lptim_cnt_synapses,
> +	.num_synapses = ARRAY_SIZE(stm32_lptim_cnt_synapses),
> +	.ext = stm32_lptim_cnt_ext,
> +	.num_ext = ARRAY_SIZE(stm32_lptim_cnt_ext)
> +};
> +
> +/* LP timer without encoder (counter only) */
> +static struct counter_count stm32_lptim_in1_counts = {
> +	.id = 0,
> +	.name = "LPTimer Count",
> +	.functions_list = stm32_lptim_cnt_functions,
> +	.num_functions = 1,
> +	.synapses = stm32_lptim_cnt_synapses,
> +	.num_synapses = 1,
> +	.ext = stm32_lptim_cnt_ext,
> +	.num_ext = ARRAY_SIZE(stm32_lptim_cnt_ext)
> +};
> +
>  static int stm32_lptim_cnt_probe(struct platform_device *pdev)
>  {
>  	struct stm32_lptimer *ddata = dev_get_drvdata(pdev->dev.parent);
>  	struct stm32_lptim_cnt *priv;
>  	struct iio_dev *indio_dev;
> +	int ret;
>  
>  	if (IS_ERR_OR_NULL(ddata))
>  		return -EINVAL;
> @@ -344,8 +641,9 @@ static int stm32_lptim_cnt_probe(struct platform_device *pdev)
>  	priv->dev = &pdev->dev;
>  	priv->regmap = ddata->regmap;
>  	priv->clk = ddata->clk;
> -	priv->preset = STM32_LPTIM_MAX_ARR;
> +	priv->ceiling = STM32_LPTIM_MAX_ARR;
>  
> +	/* Initialize IIO device */
>  	indio_dev->name = dev_name(&pdev->dev);
>  	indio_dev->dev.parent = &pdev->dev;
>  	indio_dev->dev.of_node = pdev->dev.of_node;
> @@ -356,9 +654,28 @@ static int stm32_lptim_cnt_probe(struct platform_device *pdev)
>  		indio_dev->channels = &stm32_lptim_cnt_channels;
>  	indio_dev->num_channels = 1;
>  
> +	/* Initialize Counter device */
> +	priv->counter.name = dev_name(&pdev->dev);
> +	priv->counter.parent = &pdev->dev;
> +	priv->counter.ops = &stm32_lptim_cnt_ops;
> +	if (ddata->has_encoder) {
> +		priv->counter.counts = &stm32_lptim_enc_counts;
> +		priv->counter.num_signals = ARRAY_SIZE(stm32_lptim_cnt_signals);
> +	} else {
> +		priv->counter.counts = &stm32_lptim_in1_counts;
> +		priv->counter.num_signals = 1;
> +	}
> +	priv->counter.num_counts = 1;
> +	priv->counter.signals = stm32_lptim_cnt_signals;
> +	priv->counter.priv = priv;
> +
>  	platform_set_drvdata(pdev, priv);
>  
> -	return devm_iio_device_register(&pdev->dev, indio_dev);
> +	ret = devm_iio_device_register(&pdev->dev, indio_dev);
> +	if (ret)
> +		return ret;
> +
> +	return devm_counter_register(&pdev->dev, &priv->counter);
>  }
>  
>  static const struct of_device_id stm32_lptim_cnt_of_match[] = {
> diff --git a/drivers/iio/Kconfig b/drivers/iio/Kconfig
> index d08aeb41cd07..ac764840483a 100644
> --- a/drivers/iio/Kconfig
> +++ b/drivers/iio/Kconfig
> @@ -74,7 +74,6 @@ source "drivers/iio/afe/Kconfig"
>  source "drivers/iio/amplifiers/Kconfig"
>  source "drivers/iio/chemical/Kconfig"
>  source "drivers/iio/common/Kconfig"
> -source "drivers/iio/counter/Kconfig"
>  source "drivers/iio/dac/Kconfig"
>  source "drivers/iio/dummy/Kconfig"
>  source "drivers/iio/frequency/Kconfig"
> diff --git a/drivers/iio/Makefile b/drivers/iio/Makefile
> index cb5993251381..bff682ad1cfb 100644
> --- a/drivers/iio/Makefile
> +++ b/drivers/iio/Makefile
> @@ -20,7 +20,6 @@ obj-y += amplifiers/
>  obj-y += buffer/
>  obj-y += chemical/
>  obj-y += common/
> -obj-y += counter/
>  obj-y += dac/
>  obj-y += dummy/
>  obj-y += gyro/
> diff --git a/drivers/iio/counter/Kconfig b/drivers/iio/counter/Kconfig
> deleted file mode 100644
> index eeb358122cbe..000000000000
> --- a/drivers/iio/counter/Kconfig
> +++ /dev/null
> @@ -1,17 +0,0 @@
> -#
> -# Counter devices
> -#
> -# When adding new entries keep the list in alphabetical order
> -
> -menu "Counters"
> -
> -config STM32_LPTIMER_CNT
> -	tristate "STM32 LP Timer encoder counter driver"
> -	depends on MFD_STM32_LPTIMER || COMPILE_TEST
> -	help
> -	  Select this option to enable STM32 Low-Power Timer quadrature encoder
> -	  and counter driver.
> -
> -	  To compile this driver as a module, choose M here: the
> -	  module will be called stm32-lptimer-cnt.
> -endmenu
> diff --git a/drivers/iio/counter/Makefile b/drivers/iio/counter/Makefile
> deleted file mode 100644
> index 93933ba49280..000000000000
> --- a/drivers/iio/counter/Makefile
> +++ /dev/null
> @@ -1,7 +0,0 @@
> -#
> -# Makefile for IIO counter devices
> -#
> -
> -# When adding new entries keep the list in alphabetical order
> -
> -obj-$(CONFIG_STM32_LPTIMER_CNT)	+= stm32-lptimer-cnt.o