[PATCH v2 0/2] iio: imu: st_lsm6dsx: add capability to select interrupt pin

[PATCH v2 0/2] iio: imu: st_lsm6dsx: add capability to select interrupt pin

[Lorenzo Bianconi]

Changes since v1:
- rely on the -ENOSYS return value from of_property_read_u32 to check if OF
  has been enabled

Lorenzo Bianconi (2):
  iio: imu: st_lsm6dsx: add possibility to select drdy pin
  Documentation: dt: iio: imu: st_lsm6dsx: add st,drdy-int-pin property

 .../devicetree/bindings/iio/imu/st_lsm6dsx.txt     |  2 +
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c       | 59 +++++++++++++++++++---
 2 files changed, 55 insertions(+), 6 deletions(-)

-- 
2.9.3

[PATCH v2 1/2] iio: imu: st_lsm6dsx: add possibility to select drdy pin

[Lorenzo Bianconi]

Add capability to route data ready signal on pin 1 or pin 2 of the package

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
---
 drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 59 +++++++++++++++++++++++++---
 1 file changed, 53 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
index f869dfa..c92ddcc 100644
--- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
+++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
@@ -37,11 +37,14 @@
 #include <linux/iio/iio.h>
 #include <linux/iio/sysfs.h>
 
+#include <linux/platform_data/st_sensors_pdata.h>
+
 #include "st_lsm6dsx.h"
 
 #define ST_LSM6DSX_REG_ACC_DEC_MASK		GENMASK(2, 0)
 #define ST_LSM6DSX_REG_GYRO_DEC_MASK		GENMASK(5, 3)
 #define ST_LSM6DSX_REG_INT1_ADDR		0x0d
+#define ST_LSM6DSX_REG_INT2_ADDR		0x0e
 #define ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK	BIT(3)
 #define ST_LSM6DSX_REG_WHOAMI_ADDR		0x0f
 #define ST_LSM6DSX_REG_RESET_ADDR		0x12
@@ -532,10 +535,56 @@ static const struct iio_info st_lsm6dsx_gyro_info = {
 
 static const unsigned long st_lsm6dsx_available_scan_masks[] = {0x7, 0x0};
 
+static int st_lsm6dsx_of_get_drdy_pin(struct st_lsm6dsx_hw *hw, int *drdy_pin)
+{
+	struct device_node *np = hw->dev->of_node;
+	int err;
+
+	if (!np)
+		return -EINVAL;
+
+	err = of_property_read_u32(np, "st,drdy-int-pin", drdy_pin);
+	if (err == -ENODATA) {
+		/* if the property has not been specified use default value */
+		*drdy_pin = 1;
+		err = 0;
+	}
+
+	return err;
+}
+
+static int st_lsm6dsx_get_drdy_reg(struct st_lsm6dsx_hw *hw, u8 *drdy_reg)
+{
+	int err = 0, drdy_pin;
+
+	if (st_lsm6dsx_of_get_drdy_pin(hw, &drdy_pin) < 0) {
+		struct st_sensors_platform_data *pdata;
+		struct device *dev = hw->dev;
+
+		pdata = (struct st_sensors_platform_data *)dev->platform_data;
+		drdy_pin = pdata ? pdata->drdy_int_pin : 1;
+	}
+
+	switch (drdy_pin) {
+	case 1:
+		*drdy_reg = ST_LSM6DSX_REG_INT1_ADDR;
+		break;
+	case 2:
+		*drdy_reg = ST_LSM6DSX_REG_INT2_ADDR;
+		break;
+	default:
+		dev_err(hw->dev, "unsupported data ready pin\n");
+		err = -EINVAL;
+		break;
+	}
+
+	return err;
+}
+
 static int st_lsm6dsx_init_device(struct st_lsm6dsx_hw *hw)
 {
+	u8 data, drdy_int_reg;
 	int err;
-	u8 data;
 
 	data = ST_LSM6DSX_REG_RESET_MASK;
 	err = hw->tf->write(hw->dev, ST_LSM6DSX_REG_RESET_ADDR, sizeof(data),
@@ -563,14 +612,12 @@ static int st_lsm6dsx_init_device(struct st_lsm6dsx_hw *hw)
 		return err;
 
 	/* enable FIFO watermak interrupt */
-	err = st_lsm6dsx_write_with_mask(hw, ST_LSM6DSX_REG_INT1_ADDR,
-					 ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK, 1);
+	err = st_lsm6dsx_get_drdy_reg(hw, &drdy_int_reg);
 	if (err < 0)
 		return err;
 
-	/* redirect INT2 on INT1 */
-	return st_lsm6dsx_write_with_mask(hw, ST_LSM6DSX_REG_INT2_ON_INT1_ADDR,
-					  ST_LSM6DSX_REG_INT2_ON_INT1_MASK, 1);
+	return st_lsm6dsx_write_with_mask(hw, drdy_int_reg,
+					  ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK, 1);
 }
 
 static struct iio_dev *st_lsm6dsx_alloc_iiodev(struct st_lsm6dsx_hw *hw,
-- 
2.9.3

[PATCH v2 2/2] Documentation: dt: iio: imu: st_lsm6dsx: add st,drdy-int-pin property

[Lorenzo Bianconi]

Add st,drdy-int-pin property to select interrupt pin of the package

Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
---
 Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt b/Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt
index ed3cdac..cf81afd 100644
--- a/Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt
+++ b/Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt
@@ -7,6 +7,8 @@ Required properties:
 - reg: i2c address of the sensor / spi cs line
 
 Optional properties:
+- st,drdy-int-pin: the pin on the package that will be used to signal
+  "data ready" (valid values: 1 or 2).
 - interrupt-parent: should be the phandle for the interrupt controller
 - interrupts: interrupt mapping for IRQ. It should be configured with
   flags IRQ_TYPE_LEVEL_HIGH or IRQ_TYPE_EDGE_RISING.
-- 
2.9.3

Re: [PATCH v2 2/2] Documentation: dt: iio: imu: st_lsm6dsx: add st,drdy-int-pin property

[Rob Herring]

On Sun, Jan 22, 2017 at 07:32:25PM +0100, Lorenzo Bianconi wrote:
> Add st,drdy-int-pin property to select interrupt pin of the package
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
> ---
>  Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt | 2 ++
>  1 file changed, 2 insertions(+)

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 1/2] iio: imu: st_lsm6dsx: add possibility to select drdy pin

[Jonathan Cameron]

On 22/01/17 18:32, Lorenzo Bianconi wrote:
> Add capability to route data ready signal on pin 1 or pin 2 of the package
> 
> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan
> ---
>  drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c | 59 +++++++++++++++++++++++++---
>  1 file changed, 53 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> index f869dfa..c92ddcc 100644
> --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_core.c
> @@ -37,11 +37,14 @@
>  #include <linux/iio/iio.h>
>  #include <linux/iio/sysfs.h>
>  
> +#include <linux/platform_data/st_sensors_pdata.h>
> +
>  #include "st_lsm6dsx.h"
>  
>  #define ST_LSM6DSX_REG_ACC_DEC_MASK		GENMASK(2, 0)
>  #define ST_LSM6DSX_REG_GYRO_DEC_MASK		GENMASK(5, 3)
>  #define ST_LSM6DSX_REG_INT1_ADDR		0x0d
> +#define ST_LSM6DSX_REG_INT2_ADDR		0x0e
>  #define ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK	BIT(3)
>  #define ST_LSM6DSX_REG_WHOAMI_ADDR		0x0f
>  #define ST_LSM6DSX_REG_RESET_ADDR		0x12
> @@ -532,10 +535,56 @@ static const struct iio_info st_lsm6dsx_gyro_info = {
>  
>  static const unsigned long st_lsm6dsx_available_scan_masks[] = {0x7, 0x0};
>  
> +static int st_lsm6dsx_of_get_drdy_pin(struct st_lsm6dsx_hw *hw, int *drdy_pin)
> +{
> +	struct device_node *np = hw->dev->of_node;
> +	int err;
> +
> +	if (!np)
> +		return -EINVAL;
> +
> +	err = of_property_read_u32(np, "st,drdy-int-pin", drdy_pin);
> +	if (err == -ENODATA) {
> +		/* if the property has not been specified use default value */
> +		*drdy_pin = 1;
> +		err = 0;
> +	}
> +
> +	return err;
> +}
> +
> +static int st_lsm6dsx_get_drdy_reg(struct st_lsm6dsx_hw *hw, u8 *drdy_reg)
> +{
> +	int err = 0, drdy_pin;
> +
> +	if (st_lsm6dsx_of_get_drdy_pin(hw, &drdy_pin) < 0) {
> +		struct st_sensors_platform_data *pdata;
> +		struct device *dev = hw->dev;
> +
> +		pdata = (struct st_sensors_platform_data *)dev->platform_data;
> +		drdy_pin = pdata ? pdata->drdy_int_pin : 1;
> +	}
> +
> +	switch (drdy_pin) {
> +	case 1:
> +		*drdy_reg = ST_LSM6DSX_REG_INT1_ADDR;
> +		break;
> +	case 2:
> +		*drdy_reg = ST_LSM6DSX_REG_INT2_ADDR;
> +		break;
> +	default:
> +		dev_err(hw->dev, "unsupported data ready pin\n");
> +		err = -EINVAL;
> +		break;
> +	}
> +
> +	return err;
> +}
> +
>  static int st_lsm6dsx_init_device(struct st_lsm6dsx_hw *hw)
>  {
> +	u8 data, drdy_int_reg;
>  	int err;
> -	u8 data;
>  
>  	data = ST_LSM6DSX_REG_RESET_MASK;
>  	err = hw->tf->write(hw->dev, ST_LSM6DSX_REG_RESET_ADDR, sizeof(data),
> @@ -563,14 +612,12 @@ static int st_lsm6dsx_init_device(struct st_lsm6dsx_hw *hw)
>  		return err;
>  
>  	/* enable FIFO watermak interrupt */
> -	err = st_lsm6dsx_write_with_mask(hw, ST_LSM6DSX_REG_INT1_ADDR,
> -					 ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK, 1);
> +	err = st_lsm6dsx_get_drdy_reg(hw, &drdy_int_reg);
>  	if (err < 0)
>  		return err;
>  
> -	/* redirect INT2 on INT1 */
> -	return st_lsm6dsx_write_with_mask(hw, ST_LSM6DSX_REG_INT2_ON_INT1_ADDR,
> -					  ST_LSM6DSX_REG_INT2_ON_INT1_MASK, 1);
> +	return st_lsm6dsx_write_with_mask(hw, drdy_int_reg,
> +					  ST_LSM6DSX_REG_FIFO_FTH_IRQ_MASK, 1);
>  }
>  
>  static struct iio_dev *st_lsm6dsx_alloc_iiodev(struct st_lsm6dsx_hw *hw,
> 

Re: [PATCH v2 2/2] Documentation: dt: iio: imu: st_lsm6dsx: add st,drdy-int-pin property

[Jonathan Cameron]

On 23/01/17 20:45, Rob Herring wrote:
> On Sun, Jan 22, 2017 at 07:32:25PM +0100, Lorenzo Bianconi wrote:
>> Add st,drdy-int-pin property to select interrupt pin of the package
>>
>> Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
>> ---
>>  Documentation/devicetree/bindings/iio/imu/st_lsm6dsx.txt | 2 ++
>>  1 file changed, 2 insertions(+)
> 
> Acked-by: Rob Herring <robh@kernel.org>
> 
Applied

Thanks,
Jonathan