[PATCH v3 0/4] iio: adc: at91: misc driver cleanups

[PATCH v3 0/4] iio: adc: at91: misc driver cleanups

[Alexandru Ardelean]

This whole thing started because the lkp bot haunted me for a while with
this build warning:

>> drivers/iio/adc/at91_adc.c:1439:34: warning: unused variable
>> 'at91_adc_dt_ids' [-Wunused-const-variable]
   static const struct of_device_id at91_adc_dt_ids[] = {
                                    ^
   1 warning generated.

The fix may likely be patch 'iio: adc: at91_adc: add Kconfig dependency
on the OF symbol'; was pointed out by Jonathan.

Changelog v2 -> v3:
- https://lore.kernel.org/linux-iio/20200930060008.42134-1-alexandru.ardelean@analog.com/T/#t
- added 'Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>'
  for patches:
     iio: adc: at91_adc: use of_device_get_match_data() helper
     iio: adc: at91_adc: const-ify some driver data
- fixed description for patch 'iio: adc: at91_adc: add Kconfig dependency on the OF symbol'
- squash patches:
     iio: adc: at91_adc: add Kconfig dependency on the OF symbol
     iio: adc: at91_adc: remove of_match_ptr() usage
- added patch: 'iio: adc: at91_adc: remove platform data and move defs in driver file'

Changelog v1 -> v2:
- https://lore.kernel.org/linux-iio/CA+U=Dspd11N-pXXnnY_5CSzNp50iRr7h16zXTCxo8Fk+v48F7g@mail.gmail.com/T/#m7c0efef4dc623776fe8bafdb5f734b0eaca50f82
- for patch 'iio: adc: at91_adc: use of_device_get_match_data() helper'
  changed description; it's just tidy-up patch, not a fix
- added 2 more patches:
  - iio: adc: at91_adc: add Kconfig dependency on the OF symbol
  - iio: adc: at91_adc: remove of_match_ptr() usage

Alexandru Ardelean (4):
  iio: adc: at91_adc: use of_device_get_match_data() helper
  iio: adc: at91_adc: const-ify some driver data
  iio: adc: at91_adc: add Kconfig dep on the OF symbol and remove
    of_match_ptr()
  iio: adc: at91_adc: remove platform data and move defs in driver file

 drivers/iio/adc/Kconfig                |  2 +-
 drivers/iio/adc/at91_adc.c             | 64 ++++++++++----------------
 include/linux/platform_data/at91_adc.h | 49 --------------------
 3 files changed, 26 insertions(+), 89 deletions(-)
 delete mode 100644 include/linux/platform_data/at91_adc.h

-- 
2.17.1


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[PATCH v3 1/4] iio: adc: at91_adc: use of_device_get_match_data() helper

[Alexandru Ardelean]

This is a small tidy-up. The of_device_get_match_data() helper retrieves
the driver data from the OF table, without needed to explicitly know the
table variable (since it can retrieve it from the driver object).

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/at91_adc.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 9b2c548fae95..c9ec0a4a357e 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -829,8 +829,6 @@ static u32 calc_startup_ticks_9x5(u32 startup_time, u32 adc_clk_khz)
 	return ticks;
 }
 
-static const struct of_device_id at91_adc_dt_ids[];
-
 static int at91_adc_probe_dt_ts(struct device_node *node,
 	struct at91_adc_state *st, struct device *dev)
 {
@@ -878,8 +876,7 @@ static int at91_adc_probe_dt(struct iio_dev *idev,
 	if (!node)
 		return -EINVAL;
 
-	st->caps = (struct at91_adc_caps *)
-		of_match_device(at91_adc_dt_ids, &pdev->dev)->data;
+	st->caps = (struct at91_adc_caps *)of_device_get_match_data(&pdev->dev);
 
 	st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");
 
-- 
2.17.1


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[PATCH v3 2/4] iio: adc: at91_adc: const-ify some driver data

[Alexandru Ardelean]

The main intent is to get rid of the cast for the void-pointer returned by
of_device_get_match_data().

This requires const-ifying the 'caps' and 'registers' references on the
at91_adc_state struct.

The caps can be obtained also from the old platform_data (in the
at91_adc_probe_pdata() function), but that cast is not touched in this
patch, since the old platform_data should be removed/cleaned-away.
Also, that cast deals with converting a kernel_ulong_t type to a pointer.
So, updating that cast doesn't yield any benefit.

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/at91_adc.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index c9ec0a4a357e..7d846a2852a5 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -202,7 +202,7 @@ struct at91_adc_state {
 	struct mutex		lock;
 	u8			num_channels;
 	void __iomem		*reg_base;
-	struct at91_adc_reg_desc *registers;
+	const struct at91_adc_reg_desc *registers;
 	u32			startup_time;
 	u8			sample_hold_time;
 	bool			sleep_mode;
@@ -214,7 +214,7 @@ struct at91_adc_state {
 	u32			res;		/* resolution used for convertions */
 	bool			low_res;	/* the resolution corresponds to the lowest one */
 	wait_queue_head_t	wq_data_avail;
-	struct at91_adc_caps	*caps;
+	const struct at91_adc_caps	*caps;
 
 	/*
 	 * Following ADC channels are shared by touchscreen:
@@ -550,7 +550,7 @@ static int at91_adc_configure_trigger(struct iio_trigger *trig, bool state)
 {
 	struct iio_dev *idev = iio_trigger_get_drvdata(trig);
 	struct at91_adc_state *st = iio_priv(idev);
-	struct at91_adc_reg_desc *reg = st->registers;
+	const struct at91_adc_reg_desc *reg = st->registers;
 	u32 status = at91_adc_readl(st, reg->trigger_register);
 	int value;
 	u8 bit;
@@ -876,7 +876,7 @@ static int at91_adc_probe_dt(struct iio_dev *idev,
 	if (!node)
 		return -EINVAL;
 
-	st->caps = (struct at91_adc_caps *)of_device_get_match_data(&pdev->dev);
+	st->caps = of_device_get_match_data(&pdev->dev);
 
 	st->use_external = of_property_read_bool(node, "atmel,adc-use-external-triggers");
 
-- 
2.17.1


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[PATCH v3 3/4] iio: adc: at91_adc: add Kconfig dep on the OF symbol and remove of_match_ptr()

[Alexandru Ardelean]

This tries to solve a warning reported by the lkp bot:

>> drivers/iio/adc/at91_adc.c:1439:34: warning: unused variable
>> 'at91_adc_dt_ids' [-Wunused-const-variable]
   static const struct of_device_id at91_adc_dt_ids[] = {
                                    ^
   1 warning generated.

This warning has appeared after the AT91_ADC driver compilation has been
enabled via the COMPILE_TEST symbol dependency.

The warning is caused by the 'of_match_ptr()' helper which returns NULL if
OF is undefined. This driver should build only for device-tree context, so
a dependency on the OF Kconfig symbol has been added.
Also, the usage of of_match_ptr() helper has been removed since it
shouldn't ever return NULL (because the driver should not be built for the
non-OF context).

Fixes: 4027860dcc4c ("iio: Kconfig: at91_adc: add COMPILE_TEST dependency to driver")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/Kconfig    | 2 +-
 drivers/iio/adc/at91_adc.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 91ae90514aff..17e9ceb9c6c4 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -295,7 +295,7 @@ config ASPEED_ADC
 config AT91_ADC
 	tristate "Atmel AT91 ADC"
 	depends on ARCH_AT91 || COMPILE_TEST
-	depends on INPUT && SYSFS
+	depends on INPUT && SYSFS && OF
 	select IIO_BUFFER
 	select IIO_TRIGGERED_BUFFER
 	help
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 7d846a2852a5..473bffe84fbd 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -1466,7 +1466,7 @@ static struct platform_driver at91_adc_driver = {
 	.id_table = at91_adc_ids,
 	.driver = {
 		   .name = DRIVER_NAME,
-		   .of_match_table = of_match_ptr(at91_adc_dt_ids),
+		   .of_match_table = at91_adc_dt_ids,
 		   .pm = &at91_adc_pm_ops,
 	},
 };
-- 
2.17.1


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Re: [PATCH v3 3/4] iio: adc: at91_adc: add Kconfig dep on the OF symbol and remove of_match_ptr()

[Alexandre Belloni]

On 30/09/2020 15:52:15+0300, Alexandru Ardelean wrote:
> This tries to solve a warning reported by the lkp bot:
> 
> >> drivers/iio/adc/at91_adc.c:1439:34: warning: unused variable
> >> 'at91_adc_dt_ids' [-Wunused-const-variable]
>    static const struct of_device_id at91_adc_dt_ids[] = {
>                                     ^
>    1 warning generated.
> 
> This warning has appeared after the AT91_ADC driver compilation has been
> enabled via the COMPILE_TEST symbol dependency.
> 
> The warning is caused by the 'of_match_ptr()' helper which returns NULL if
> OF is undefined. This driver should build only for device-tree context, so
> a dependency on the OF Kconfig symbol has been added.
> Also, the usage of of_match_ptr() helper has been removed since it
> shouldn't ever return NULL (because the driver should not be built for the
> non-OF context).
> 
> Fixes: 4027860dcc4c ("iio: Kconfig: at91_adc: add COMPILE_TEST dependency to driver")
> Reported-by: kernel test robot <lkp@intel.com>
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>

Reviewed-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

> ---
>  drivers/iio/adc/Kconfig    | 2 +-
>  drivers/iio/adc/at91_adc.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 91ae90514aff..17e9ceb9c6c4 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -295,7 +295,7 @@ config ASPEED_ADC
>  config AT91_ADC
>  	tristate "Atmel AT91 ADC"
>  	depends on ARCH_AT91 || COMPILE_TEST
> -	depends on INPUT && SYSFS
> +	depends on INPUT && SYSFS && OF
>  	select IIO_BUFFER
>  	select IIO_TRIGGERED_BUFFER
>  	help
> diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
> index 7d846a2852a5..473bffe84fbd 100644
> --- a/drivers/iio/adc/at91_adc.c
> +++ b/drivers/iio/adc/at91_adc.c
> @@ -1466,7 +1466,7 @@ static struct platform_driver at91_adc_driver = {
>  	.id_table = at91_adc_ids,
>  	.driver = {
>  		   .name = DRIVER_NAME,
> -		   .of_match_table = of_match_ptr(at91_adc_dt_ids),
> +		   .of_match_table = at91_adc_dt_ids,
>  		   .pm = &at91_adc_pm_ops,
>  	},
>  };
> -- 
> 2.17.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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[PATCH v3 4/4] iio: adc: at91_adc: remove platform data and move defs in driver file

[Alexandru Ardelean]

The AT91 ADC driver no longer uses the 'at91_add_device_adc' platform data
type. This is no longer used (at least in mainline drivers).

This change removes the platform-data initialization from the driver, since
it is mostly dead code now.

Some definitions [from the platform data at91_adc.h include] have been to
be moved in the driver, since they are needed in the driver.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
---
 drivers/iio/adc/at91_adc.c             | 51 ++++++++++----------------
 include/linux/platform_data/at91_adc.h | 49 -------------------------
 2 files changed, 20 insertions(+), 80 deletions(-)
 delete mode 100644 include/linux/platform_data/at91_adc.h

diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
index 473bffe84fbd..d0e56b1b5949 100644
--- a/drivers/iio/adc/at91_adc.c
+++ b/drivers/iio/adc/at91_adc.c
@@ -22,8 +22,6 @@
 #include <linux/slab.h>
 #include <linux/wait.h>
 
-#include <linux/platform_data/at91_adc.h>
-
 #include <linux/iio/iio.h>
 #include <linux/iio/buffer.h>
 #include <linux/iio/trigger.h>
@@ -153,6 +151,25 @@
 #define TOUCH_SHTIM                    0xa
 #define TOUCH_SCTIM_US		10		/* 10us for the Touchscreen Switches Closure Time */
 
+enum atmel_adc_ts_type {
+	ATMEL_ADC_TOUCHSCREEN_NONE = 0,
+	ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
+	ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
+};
+
+/**
+ * struct at91_adc_trigger - description of triggers
+ * @name:		name of the trigger advertised to the user
+ * @value:		value to set in the ADC's trigger setup register
+			to enable the trigger
+ * @is_external:	Does the trigger rely on an external pin?
+ */
+struct at91_adc_trigger {
+	const char	*name;
+	u8		value;
+	bool		is_external;
+};
+
 /**
  * struct at91_adc_reg_desc - Various informations relative to registers
  * @channel_base:	Base offset for the channel data registers
@@ -957,30 +974,6 @@ static int at91_adc_probe_dt(struct iio_dev *idev,
 	return ret;
 }
 
-static int at91_adc_probe_pdata(struct at91_adc_state *st,
-				struct platform_device *pdev)
-{
-	struct at91_adc_data *pdata = pdev->dev.platform_data;
-
-	if (!pdata)
-		return -EINVAL;
-
-	st->caps = (struct at91_adc_caps *)
-			platform_get_device_id(pdev)->driver_data;
-
-	st->use_external = pdata->use_external_triggers;
-	st->vref_mv = pdata->vref;
-	st->channels_mask = pdata->channels_used;
-	st->num_channels = st->caps->num_channels;
-	st->startup_time = pdata->startup_time;
-	st->trigger_number = pdata->trigger_number;
-	st->trigger_list = pdata->trigger_list;
-	st->registers = &st->caps->registers;
-	st->touchscreen_type = pdata->touchscreen_type;
-
-	return 0;
-}
-
 static const struct iio_info at91_adc_info = {
 	.read_raw = &at91_adc_read_raw,
 };
@@ -1157,11 +1150,7 @@ static int at91_adc_probe(struct platform_device *pdev)
 
 	st = iio_priv(idev);
 
-	if (pdev->dev.of_node)
-		ret = at91_adc_probe_dt(idev, pdev);
-	else
-		ret = at91_adc_probe_pdata(st, pdev);
-
+	ret = at91_adc_probe_dt(idev, pdev);
 	if (ret) {
 		dev_err(&pdev->dev, "No platform data available.\n");
 		return -EINVAL;
diff --git a/include/linux/platform_data/at91_adc.h b/include/linux/platform_data/at91_adc.h
deleted file mode 100644
index f20eaeb827ce..000000000000
--- a/include/linux/platform_data/at91_adc.h
+++ /dev/null
@@ -1,49 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later */
-/*
- * Copyright (C) 2011 Free Electrons
- */
-
-#ifndef _AT91_ADC_H_
-#define _AT91_ADC_H_
-
-enum atmel_adc_ts_type {
-	ATMEL_ADC_TOUCHSCREEN_NONE = 0,
-	ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
-	ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
-};
-
-/**
- * struct at91_adc_trigger - description of triggers
- * @name:		name of the trigger advertised to the user
- * @value:		value to set in the ADC's trigger setup register
-			to enable the trigger
- * @is_external:	Does the trigger rely on an external pin?
- */
-struct at91_adc_trigger {
-	const char	*name;
-	u8		value;
-	bool		is_external;
-};
-
-/**
- * struct at91_adc_data - platform data for ADC driver
- * @channels_used:		channels in use on the board as a bitmask
- * @startup_time:		startup time of the ADC in microseconds
- * @trigger_list:		Triggers available in the ADC
- * @trigger_number:		Number of triggers available in the ADC
- * @use_external_triggers:	does the board has external triggers availables
- * @vref:			Reference voltage for the ADC in millivolts
- * @touchscreen_type:		If a touchscreen is connected, its type (4 or 5 wires)
- */
-struct at91_adc_data {
-	unsigned long			channels_used;
-	u8				startup_time;
-	struct at91_adc_trigger		*trigger_list;
-	u8				trigger_number;
-	bool				use_external_triggers;
-	u16				vref;
-	enum atmel_adc_ts_type		touchscreen_type;
-};
-
-extern void __init at91_add_device_adc(struct at91_adc_data *data);
-#endif
-- 
2.17.1


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Re: [PATCH v3 4/4] iio: adc: at91_adc: remove platform data and move defs in driver file

[Alexandre Belloni]

On 30/09/2020 15:52:16+0300, Alexandru Ardelean wrote:
> The AT91 ADC driver no longer uses the 'at91_add_device_adc' platform data
> type. This is no longer used (at least in mainline drivers).

s/drivers/boards/

> 
> This change removes the platform-data initialization from the driver, since
> it is mostly dead code now.

It is definitively dead code, it has been a while that board file
support has been removed for the platforms with this ADC.

> 
> Some definitions [from the platform data at91_adc.h include] have been to
> be moved in the driver, since they are needed in the driver.

s/to be//

> 
> Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
> ---
>  drivers/iio/adc/at91_adc.c             | 51 ++++++++++----------------
>  include/linux/platform_data/at91_adc.h | 49 -------------------------
>  2 files changed, 20 insertions(+), 80 deletions(-)
>  delete mode 100644 include/linux/platform_data/at91_adc.h
> 
> diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c
> index 473bffe84fbd..d0e56b1b5949 100644
> --- a/drivers/iio/adc/at91_adc.c
> +++ b/drivers/iio/adc/at91_adc.c
> @@ -22,8 +22,6 @@
>  #include <linux/slab.h>
>  #include <linux/wait.h>
>  
> -#include <linux/platform_data/at91_adc.h>
> -
>  #include <linux/iio/iio.h>
>  #include <linux/iio/buffer.h>
>  #include <linux/iio/trigger.h>
> @@ -153,6 +151,25 @@
>  #define TOUCH_SHTIM                    0xa
>  #define TOUCH_SCTIM_US		10		/* 10us for the Touchscreen Switches Closure Time */
>  
> +enum atmel_adc_ts_type {
> +	ATMEL_ADC_TOUCHSCREEN_NONE = 0,
> +	ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
> +	ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
> +};
> +
> +/**
> + * struct at91_adc_trigger - description of triggers
> + * @name:		name of the trigger advertised to the user
> + * @value:		value to set in the ADC's trigger setup register
> +			to enable the trigger
> + * @is_external:	Does the trigger rely on an external pin?
> + */
> +struct at91_adc_trigger {
> +	const char	*name;
> +	u8		value;
> +	bool		is_external;
> +};
> +
>  /**
>   * struct at91_adc_reg_desc - Various informations relative to registers
>   * @channel_base:	Base offset for the channel data registers
> @@ -957,30 +974,6 @@ static int at91_adc_probe_dt(struct iio_dev *idev,
>  	return ret;
>  }
>  
> -static int at91_adc_probe_pdata(struct at91_adc_state *st,
> -				struct platform_device *pdev)
> -{
> -	struct at91_adc_data *pdata = pdev->dev.platform_data;
> -
> -	if (!pdata)
> -		return -EINVAL;
> -
> -	st->caps = (struct at91_adc_caps *)
> -			platform_get_device_id(pdev)->driver_data;
> -
> -	st->use_external = pdata->use_external_triggers;
> -	st->vref_mv = pdata->vref;
> -	st->channels_mask = pdata->channels_used;
> -	st->num_channels = st->caps->num_channels;
> -	st->startup_time = pdata->startup_time;
> -	st->trigger_number = pdata->trigger_number;
> -	st->trigger_list = pdata->trigger_list;
> -	st->registers = &st->caps->registers;
> -	st->touchscreen_type = pdata->touchscreen_type;
> -
> -	return 0;
> -}
> -
>  static const struct iio_info at91_adc_info = {
>  	.read_raw = &at91_adc_read_raw,
>  };
> @@ -1157,11 +1150,7 @@ static int at91_adc_probe(struct platform_device *pdev)
>  
>  	st = iio_priv(idev);
>  
> -	if (pdev->dev.of_node)
> -		ret = at91_adc_probe_dt(idev, pdev);
> -	else
> -		ret = at91_adc_probe_pdata(st, pdev);
> -
> +	ret = at91_adc_probe_dt(idev, pdev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "No platform data available.\n");
>  		return -EINVAL;

You can simply do:

	if (ret)
		return ret;

The debug message is not relevant anymore.

You can also remove:

	if (!node)
		return -EINVAL;

from at91_adc_probe_dt, there is no way the driver will probe without a
DT node.


> diff --git a/include/linux/platform_data/at91_adc.h b/include/linux/platform_data/at91_adc.h
> deleted file mode 100644
> index f20eaeb827ce..000000000000
> --- a/include/linux/platform_data/at91_adc.h
> +++ /dev/null
> @@ -1,49 +0,0 @@
> -/* SPDX-License-Identifier: GPL-2.0-or-later */
> -/*
> - * Copyright (C) 2011 Free Electrons
> - */
> -
> -#ifndef _AT91_ADC_H_
> -#define _AT91_ADC_H_
> -
> -enum atmel_adc_ts_type {
> -	ATMEL_ADC_TOUCHSCREEN_NONE = 0,
> -	ATMEL_ADC_TOUCHSCREEN_4WIRE = 4,
> -	ATMEL_ADC_TOUCHSCREEN_5WIRE = 5,
> -};
> -
> -/**
> - * struct at91_adc_trigger - description of triggers
> - * @name:		name of the trigger advertised to the user
> - * @value:		value to set in the ADC's trigger setup register
> -			to enable the trigger
> - * @is_external:	Does the trigger rely on an external pin?
> - */
> -struct at91_adc_trigger {
> -	const char	*name;
> -	u8		value;
> -	bool		is_external;
> -};
> -
> -/**
> - * struct at91_adc_data - platform data for ADC driver
> - * @channels_used:		channels in use on the board as a bitmask
> - * @startup_time:		startup time of the ADC in microseconds
> - * @trigger_list:		Triggers available in the ADC
> - * @trigger_number:		Number of triggers available in the ADC
> - * @use_external_triggers:	does the board has external triggers availables
> - * @vref:			Reference voltage for the ADC in millivolts
> - * @touchscreen_type:		If a touchscreen is connected, its type (4 or 5 wires)
> - */
> -struct at91_adc_data {
> -	unsigned long			channels_used;
> -	u8				startup_time;
> -	struct at91_adc_trigger		*trigger_list;
> -	u8				trigger_number;
> -	bool				use_external_triggers;
> -	u16				vref;
> -	enum atmel_adc_ts_type		touchscreen_type;
> -};
> -
> -extern void __init at91_add_device_adc(struct at91_adc_data *data);
> -#endif
> -- 
> 2.17.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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