[PATCH v2 1/2] dt-bindings: iio: imo: mpu6050: add vdd-supply

[PATCH v2 1/2] dt-bindings: iio: imo: mpu6050: add vdd-supply

[Stephan Gerhold]

inv_mpu6050 now supports an additional vdd-supply; document it.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
---
Changes in v2:
  - Add Reviewed-by from Linus Walleij

v1: https://lore.kernel.org/linux-iio/20191106183536.123070-1-stephan@gerhold.net/
---
 Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
index 268bf7568e19..c5ee8a20af9f 100644
--- a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
+++ b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
@@ -21,6 +21,7 @@ Required properties:
   bindings.
 
 Optional properties:
+ - vdd-supply: regulator phandle for VDD supply
  - vddio-supply: regulator phandle for VDDIO supply
  - mount-matrix: an optional 3x3 mounting rotation matrix
  - i2c-gate node.  These devices also support an auxiliary i2c bus.  This is
-- 
2.23.0

[PATCH v2 2/2] iio: imu: mpu6050: Add support for vdd-supply regulator

[Stephan Gerhold]

MPU6050 has two power supply pins: VDD and VLOGIC, but the
mpu6050 driver only supports enabling one of them at the moment.
In some cases, they may need to be enabled separately.

Add an additional "vdd-supply" that stays enabled for as long as
the driver is loaded. We cannot turn off the VDD regulator during
suspend as this would cause register settings (FSR, sampling rate, ...)
to be lost.

Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
---
Changes in v2:
  - Keep "vdd-supply" enabled during suspend to prevent register
    settings from getting lost.
  - Revert convertion to bulk regulator API (does not work well
    when regulators need to be enabled/disabled separately)

v1: https://lore.kernel.org/linux-iio/20191106183536.123070-2-stephan@gerhold.net/
---
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 43 +++++++++++++++++-----
 drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h  |  4 +-
 2 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
index 354030e9bed5..661a829478f5 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
@@ -1140,14 +1140,14 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
 	return result;
 }
 
-static int inv_mpu_core_enable_regulator(struct inv_mpu6050_state *st)
+static int inv_mpu_core_enable_regulator_vddio(struct inv_mpu6050_state *st)
 {
 	int result;
 
 	result = regulator_enable(st->vddio_supply);
 	if (result) {
 		dev_err(regmap_get_device(st->map),
-			"Failed to enable regulator: %d\n", result);
+			"Failed to enable vddio regulator: %d\n", result);
 	} else {
 		/* Give the device a little bit of time to start up. */
 		usleep_range(35000, 70000);
@@ -1156,21 +1156,29 @@ static int inv_mpu_core_enable_regulator(struct inv_mpu6050_state *st)
 	return result;
 }
 
-static int inv_mpu_core_disable_regulator(struct inv_mpu6050_state *st)
+static int inv_mpu_core_disable_regulator_vddio(struct inv_mpu6050_state *st)
 {
 	int result;
 
 	result = regulator_disable(st->vddio_supply);
 	if (result)
 		dev_err(regmap_get_device(st->map),
-			"Failed to disable regulator: %d\n", result);
+			"Failed to disable vddio regulator: %d\n", result);
 
 	return result;
 }
 
 static void inv_mpu_core_disable_regulator_action(void *_data)
 {
-	inv_mpu_core_disable_regulator(_data);
+	struct inv_mpu6050_state *st = _data;
+	int result;
+
+	result = regulator_disable(st->vdd_supply);
+	if (result)
+		dev_err(regmap_get_device(st->map),
+			"Failed to disable vdd regulator: %d\n", result);
+
+	inv_mpu_core_disable_regulator_vddio(st);
 }
 
 int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
@@ -1239,6 +1247,15 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
 		return -EINVAL;
 	}
 
+	st->vdd_supply = devm_regulator_get(dev, "vdd");
+	if (IS_ERR(st->vdd_supply)) {
+		if (PTR_ERR(st->vdd_supply) != -EPROBE_DEFER)
+			dev_err(dev, "Failed to get vdd regulator %d\n",
+				(int)PTR_ERR(st->vdd_supply));
+
+		return PTR_ERR(st->vdd_supply);
+	}
+
 	st->vddio_supply = devm_regulator_get(dev, "vddio");
 	if (IS_ERR(st->vddio_supply)) {
 		if (PTR_ERR(st->vddio_supply) != -EPROBE_DEFER)
@@ -1248,9 +1265,17 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
 		return PTR_ERR(st->vddio_supply);
 	}
 
-	result = inv_mpu_core_enable_regulator(st);
-	if (result)
+	result = regulator_enable(st->vdd_supply);
+	if (result) {
+		dev_err(dev, "Failed to enable vdd regulator: %d\n", result);
 		return result;
+	}
+
+	result = inv_mpu_core_enable_regulator_vddio(st);
+	if (result) {
+		regulator_disable(st->vdd_supply);
+		return result;
+	}
 
 	result = devm_add_action_or_reset(dev, inv_mpu_core_disable_regulator_action,
 				 st);
@@ -1352,7 +1377,7 @@ static int inv_mpu_resume(struct device *dev)
 	int result;
 
 	mutex_lock(&st->lock);
-	result = inv_mpu_core_enable_regulator(st);
+	result = inv_mpu_core_enable_regulator_vddio(st);
 	if (result)
 		goto out_unlock;
 
@@ -1370,7 +1395,7 @@ static int inv_mpu_suspend(struct device *dev)
 
 	mutex_lock(&st->lock);
 	result = inv_mpu6050_set_power_itg(st, false);
-	inv_mpu_core_disable_regulator(st);
+	inv_mpu_core_disable_regulator_vddio(st);
 	mutex_unlock(&st->lock);
 
 	return result;
diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
index 52fcf45050a5..4fcf683b9c63 100644
--- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
+++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
@@ -130,7 +130,8 @@ struct inv_mpu6050_hw {
  *  @chip_period:	chip internal period estimation (~1kHz).
  *  @it_timestamp:	timestamp from previous interrupt.
  *  @data_timestamp:	timestamp for next data sample.
- *  @vddio_supply	voltage regulator for the chip.
+ *  @vdd_supply:	VDD voltage regulator for the chip.
+ *  @vddio_supply	I/O voltage regulator for the chip.
  *  @magn_disabled:     magnetometer disabled for backward compatibility reason.
  *  @magn_raw_to_gauss:	coefficient to convert mag raw value to Gauss.
  *  @magn_orient:       magnetometer sensor chip orientation if available.
@@ -154,6 +155,7 @@ struct inv_mpu6050_state {
 	s64 chip_period;
 	s64 it_timestamp;
 	s64 data_timestamp;
+	struct regulator *vdd_supply;
 	struct regulator *vddio_supply;
 	bool magn_disabled;
 	s32 magn_raw_to_gauss[3];
-- 
2.23.0

Re: [PATCH v2 2/2] iio: imu: mpu6050: Add support for vdd-supply regulator

[Jonathan Cameron]

On Thu,  7 Nov 2019 19:43:42 +0100
Stephan Gerhold <stephan@gerhold.net> wrote:

> MPU6050 has two power supply pins: VDD and VLOGIC, but the
> mpu6050 driver only supports enabling one of them at the moment.
> In some cases, they may need to be enabled separately.
> 
> Add an additional "vdd-supply" that stays enabled for as long as
> the driver is loaded. We cannot turn off the VDD regulator during
> suspend as this would cause register settings (FSR, sampling rate, ...)
> to be lost.
> 
> Signed-off-by: Stephan Gerhold <stephan@gerhold.net>

Looks good to me.

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to poke it.

Thanks

Jonathan

> ---
> Changes in v2:
>   - Keep "vdd-supply" enabled during suspend to prevent register
>     settings from getting lost.
>   - Revert convertion to bulk regulator API (does not work well
>     when regulators need to be enabled/disabled separately)
> 
> v1: https://lore.kernel.org/linux-iio/20191106183536.123070-2-stephan@gerhold.net/
> ---
>  drivers/iio/imu/inv_mpu6050/inv_mpu_core.c | 43 +++++++++++++++++-----
>  drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h  |  4 +-
>  2 files changed, 37 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> index 354030e9bed5..661a829478f5 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_core.c
> @@ -1140,14 +1140,14 @@ static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)
>  	return result;
>  }
>  
> -static int inv_mpu_core_enable_regulator(struct inv_mpu6050_state *st)
> +static int inv_mpu_core_enable_regulator_vddio(struct inv_mpu6050_state *st)
>  {
>  	int result;
>  
>  	result = regulator_enable(st->vddio_supply);
>  	if (result) {
>  		dev_err(regmap_get_device(st->map),
> -			"Failed to enable regulator: %d\n", result);
> +			"Failed to enable vddio regulator: %d\n", result);
>  	} else {
>  		/* Give the device a little bit of time to start up. */
>  		usleep_range(35000, 70000);
> @@ -1156,21 +1156,29 @@ static int inv_mpu_core_enable_regulator(struct inv_mpu6050_state *st)
>  	return result;
>  }
>  
> -static int inv_mpu_core_disable_regulator(struct inv_mpu6050_state *st)
> +static int inv_mpu_core_disable_regulator_vddio(struct inv_mpu6050_state *st)
>  {
>  	int result;
>  
>  	result = regulator_disable(st->vddio_supply);
>  	if (result)
>  		dev_err(regmap_get_device(st->map),
> -			"Failed to disable regulator: %d\n", result);
> +			"Failed to disable vddio regulator: %d\n", result);
>  
>  	return result;
>  }
>  
>  static void inv_mpu_core_disable_regulator_action(void *_data)
>  {
> -	inv_mpu_core_disable_regulator(_data);
> +	struct inv_mpu6050_state *st = _data;
> +	int result;
> +
> +	result = regulator_disable(st->vdd_supply);
> +	if (result)
> +		dev_err(regmap_get_device(st->map),
> +			"Failed to disable vdd regulator: %d\n", result);
> +
> +	inv_mpu_core_disable_regulator_vddio(st);
>  }
>  
>  int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
> @@ -1239,6 +1247,15 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
>  		return -EINVAL;
>  	}
>  
> +	st->vdd_supply = devm_regulator_get(dev, "vdd");
> +	if (IS_ERR(st->vdd_supply)) {
> +		if (PTR_ERR(st->vdd_supply) != -EPROBE_DEFER)
> +			dev_err(dev, "Failed to get vdd regulator %d\n",
> +				(int)PTR_ERR(st->vdd_supply));
> +
> +		return PTR_ERR(st->vdd_supply);
> +	}
> +
>  	st->vddio_supply = devm_regulator_get(dev, "vddio");
>  	if (IS_ERR(st->vddio_supply)) {
>  		if (PTR_ERR(st->vddio_supply) != -EPROBE_DEFER)
> @@ -1248,9 +1265,17 @@ int inv_mpu_core_probe(struct regmap *regmap, int irq, const char *name,
>  		return PTR_ERR(st->vddio_supply);
>  	}
>  
> -	result = inv_mpu_core_enable_regulator(st);
> -	if (result)
> +	result = regulator_enable(st->vdd_supply);
> +	if (result) {
> +		dev_err(dev, "Failed to enable vdd regulator: %d\n", result);
>  		return result;
> +	}
> +
> +	result = inv_mpu_core_enable_regulator_vddio(st);
> +	if (result) {
> +		regulator_disable(st->vdd_supply);
> +		return result;
> +	}
>  
>  	result = devm_add_action_or_reset(dev, inv_mpu_core_disable_regulator_action,
>  				 st);
> @@ -1352,7 +1377,7 @@ static int inv_mpu_resume(struct device *dev)
>  	int result;
>  
>  	mutex_lock(&st->lock);
> -	result = inv_mpu_core_enable_regulator(st);
> +	result = inv_mpu_core_enable_regulator_vddio(st);
>  	if (result)
>  		goto out_unlock;
>  
> @@ -1370,7 +1395,7 @@ static int inv_mpu_suspend(struct device *dev)
>  
>  	mutex_lock(&st->lock);
>  	result = inv_mpu6050_set_power_itg(st, false);
> -	inv_mpu_core_disable_regulator(st);
> +	inv_mpu_core_disable_regulator_vddio(st);
>  	mutex_unlock(&st->lock);
>  
>  	return result;
> diff --git a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> index 52fcf45050a5..4fcf683b9c63 100644
> --- a/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> +++ b/drivers/iio/imu/inv_mpu6050/inv_mpu_iio.h
> @@ -130,7 +130,8 @@ struct inv_mpu6050_hw {
>   *  @chip_period:	chip internal period estimation (~1kHz).
>   *  @it_timestamp:	timestamp from previous interrupt.
>   *  @data_timestamp:	timestamp for next data sample.
> - *  @vddio_supply	voltage regulator for the chip.
> + *  @vdd_supply:	VDD voltage regulator for the chip.
> + *  @vddio_supply	I/O voltage regulator for the chip.
>   *  @magn_disabled:     magnetometer disabled for backward compatibility reason.
>   *  @magn_raw_to_gauss:	coefficient to convert mag raw value to Gauss.
>   *  @magn_orient:       magnetometer sensor chip orientation if available.
> @@ -154,6 +155,7 @@ struct inv_mpu6050_state {
>  	s64 chip_period;
>  	s64 it_timestamp;
>  	s64 data_timestamp;
> +	struct regulator *vdd_supply;
>  	struct regulator *vddio_supply;
>  	bool magn_disabled;
>  	s32 magn_raw_to_gauss[3];

Re: [PATCH v2 1/2] dt-bindings: iio: imo: mpu6050: add vdd-supply

[Jean-Baptiste Maneyrol]

Reviewed-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>

Best regards,
JB

From: linux-iio-owner@vger.kernel.org <linux-iio-owner@vger.kernel.org> on behalf of Stephan Gerhold <stephan@gerhold.net>

Sent: Thursday, November 7, 2019 19:43

To: Jonathan Cameron <jic23@kernel.org>

Cc: Hartmut Knaack <knaack.h@gmx.de>; Lars-Peter Clausen <lars@metafoo.de>; Peter Meerwald-Stadler <pmeerw@pmeerw.net>; Rob Herring <robh+dt@kernel.org>; Mark Rutland <mark.rutland@arm.com>; Linus Walleij <linus.walleij@linaro.org>; Brian Masney <masneyb@onstation.org>;
 Jonathan Marek <jonathan@marek.ca>; Jean-Baptiste Maneyrol <JManeyrol@invensense.com>; linux-iio@vger.kernel.org <linux-iio@vger.kernel.org>; devicetree@vger.kernel.org <devicetree@vger.kernel.org>; linux-kernel@vger.kernel.org <linux-kernel@vger.kernel.org>;
 Stephan Gerhold <stephan@gerhold.net>

Subject: [PATCH v2 1/2] dt-bindings: iio: imo: mpu6050: add vdd-supply

 


 CAUTION: This email originated from outside of the organization. Please make sure the sender is who they say they are and do not click links or open attachments unless you recognize the sender and know the content is safe.



inv_mpu6050 now supports an additional vdd-supply; document it.







Reviewed-by: Linus Walleij <linus.walleij@linaro.org>



Signed-off-by: Stephan Gerhold <stephan@gerhold.net>



---



Changes in v2:



  - Add Reviewed-by from Linus Walleij







v1: 
https://urldefense.proofpoint.com/v2/url?u=https-3A__lore.kernel.org_linux-2Diio_20191106183536.123070-2D1-2Dstephan-40gerhold.net_&d=DwIDAg&c=WoJWtq5JV8YrKnzRxvD8NxmTP_1wxfE0prPmo0NeZwg&r=4jiDX_1brsSWfCjfA6Ovj1d4h9MF8q7Xk5aBwG28mVk&m=O82MQPnLTvlD0nxDzFW1KS3aZpWiI3qYUZwJUy_qqxc&s=ddvzqy0PywWDCnge7xbJIhpqN9NltbLrzi4EBVdeA_o&e=




---



 Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt | 1 +



 1 file changed, 1 insertion(+)







diff --git a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt



index 268bf7568e19..c5ee8a20af9f 100644



--- a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt



+++ b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt



@@ -21,6 +21,7 @@ Required properties:



   bindings.



 



 Optional properties:



+ - vdd-supply: regulator phandle for VDD supply



  - vddio-supply: regulator phandle for VDDIO supply



  - mount-matrix: an optional 3x3 mounting rotation matrix



  - i2c-gate node.  These devices also support an auxiliary i2c bus.  This is



-- 



2.23.0

Re: [PATCH v2 1/2] dt-bindings: iio: imo: mpu6050: add vdd-supply

[Jonathan Cameron]

On Fri, 8 Nov 2019 12:11:46 +0000
Jean-Baptiste Maneyrol <JManeyrol@invensense.com> wrote:

> Reviewed-by: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Hi Jean-Baptiste,

I'm assuming that applies for both patches given you gave comments on
v1 that applied to patch 2!

Thanks,

Jonathan

> 
> Best regards,
> JB
> 
> From: linux-iio-owner@vger.kernel.org <linux-iio-owner@vger.kernel.org> on behalf of Stephan Gerhold <stephan@gerhold.net>
> 
> Sent: Thursday, November 7, 2019 19:43
> 
> To: Jonathan Cameron <jic23@kernel.org>
> 
> Cc: Hartmut Knaack <knaack.h@gmx.de>; Lars-Peter Clausen <lars@metafoo.de>; Peter Meerwald-Stadler <pmeerw@pmeerw.net>; Rob Herring <robh+dt@kernel.org>; Mark Rutland <mark.rutland@arm.com>; Linus Walleij <linus.walleij@linaro.org>; Brian Masney <masneyb@onstation.org>;
>  Jonathan Marek <jonathan@marek.ca>; Jean-Baptiste Maneyrol <JManeyrol@invensense.com>; linux-iio@vger.kernel.org <linux-iio@vger.kernel.org>; devicetree@vger.kernel.org <devicetree@vger.kernel.org>; linux-kernel@vger.kernel.org <linux-kernel@vger.kernel.org>;
>  Stephan Gerhold <stephan@gerhold.net>
> 
> Subject: [PATCH v2 1/2] dt-bindings: iio: imo: mpu6050: add vdd-supply
> 
>  
> 
> 
>  CAUTION: This email originated from outside of the organization. Please make sure the sender is who they say they are and do not click links or open attachments unless you recognize the sender and know the content is safe.
> 
> 
> 
> inv_mpu6050 now supports an additional vdd-supply; document it.
> 
> 
> 
> 
> 
> 
> 
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> 
> 
> 
> Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
> 
> 
> 
> ---
> 
> 
> 
> Changes in v2:
> 
> 
> 
>   - Add Reviewed-by from Linus Walleij
> 
> 
> 
> 
> 
> 
> 
> v1: 
> https://urldefense.proofpoint.com/v2/url?u=https-3A__lore.kernel.org_linux-2Diio_20191106183536.123070-2D1-2Dstephan-40gerhold.net_&d=DwIDAg&c=WoJWtq5JV8YrKnzRxvD8NxmTP_1wxfE0prPmo0NeZwg&r=4jiDX_1brsSWfCjfA6Ovj1d4h9MF8q7Xk5aBwG28mVk&m=O82MQPnLTvlD0nxDzFW1KS3aZpWiI3qYUZwJUy_qqxc&s=ddvzqy0PywWDCnge7xbJIhpqN9NltbLrzi4EBVdeA_o&e=
> 
> 
> 
> 
> ---
> 
> 
> 
>  Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt | 1 +
> 
> 
> 
>  1 file changed, 1 insertion(+)
> 
> 
> 
> 
> 
> 
> 
> diff --git a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
> 
> 
> 
> index 268bf7568e19..c5ee8a20af9f 100644
> 
> 
> 
> --- a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
> 
> 
> 
> +++ b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
> 
> 
> 
> @@ -21,6 +21,7 @@ Required properties:
> 
> 
> 
>    bindings.
> 
> 
> 
>  
> 
> 
> 
>  Optional properties:
> 
> 
> 
> + - vdd-supply: regulator phandle for VDD supply
> 
> 
> 
>   - vddio-supply: regulator phandle for VDDIO supply
> 
> 
> 
>   - mount-matrix: an optional 3x3 mounting rotation matrix
> 
> 
> 
>   - i2c-gate node.  These devices also support an auxiliary i2c bus.  This is
> 
> 
> 

Re: [PATCH v2 1/2] dt-bindings: iio: imo: mpu6050: add vdd-supply

[Jonathan Cameron]

On Thu,  7 Nov 2019 19:43:41 +0100
Stephan Gerhold <stephan@gerhold.net> wrote:

> inv_mpu6050 now supports an additional vdd-supply; document it.
> 
> Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
> Signed-off-by: Stephan Gerhold <stephan@gerhold.net>
Applied with imo->imu in the patch title.

Thanks,

Jonathan

> ---
> Changes in v2:
>   - Add Reviewed-by from Linus Walleij
> 
> v1: https://lore.kernel.org/linux-iio/20191106183536.123070-1-stephan@gerhold.net/
> ---
>  Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
> index 268bf7568e19..c5ee8a20af9f 100644
> --- a/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
> +++ b/Documentation/devicetree/bindings/iio/imu/inv_mpu6050.txt
> @@ -21,6 +21,7 @@ Required properties:
>    bindings.
>  
>  Optional properties:
> + - vdd-supply: regulator phandle for VDD supply
>   - vddio-supply: regulator phandle for VDDIO supply
>   - mount-matrix: an optional 3x3 mounting rotation matrix
>   - i2c-gate node.  These devices also support an auxiliary i2c bus.  This is