[PATCH v4 0/5] iio: imu: bmi160: added regulator and mount-matrix support

[PATCH v4 0/5] iio: imu: bmi160: added regulator and mount-matrix support

[Jonathan Albrieux]

v4:
 - add maintainer
 - clean up of documentation
 - added case concerning the need to add regulators, see [PATCH v4 4/5] 

v3: 
 - separate typo fix into another patch
 - clean up of documentation
 - clean up of patch messages
https://lore.kernel.org/linux-iio/20200520194656.16218-1-jonathan.albrieux@gmail.com/

v2: 
 - fixed missing description for iio: imu: bmi160: added regulator
   support
https://lore.kernel.org/linux-iio/20200519075111.6356-1-jonathan.albrieux@gmail.com/

v1:
 - initial patch submission
https://lore.kernel.org/linux-iio/20200518133358.18978-1-jonathan.albrieux@gmail.com/

Convert txt format documentation to yaml.
Add documentation about vdd-supply, vddio-supply and mount-matrix.

Add vdd-supply and vddio-supply support.

Add mount-matrix binding support. As chip could have different
orientations a mount matrix support is needed to correctly translate
these differences.

Jonathan Albrieux (5):
  dt-bindings: iio: imu: bmi160: convert format to yaml, add maintainer
  dt-bindings: iio: imu: bmi160: add regulators and mount-matrix
  iio: imu: bmi160: fix typo
  iio: imu: bmi160: added regulator support
  iio: imu: bmi160: added mount-matrix support

 .../devicetree/bindings/iio/imu/bmi160.txt    | 37 --------
 .../bindings/iio/imu/bosch,bmi160.yaml        | 91 +++++++++++++++++++
 drivers/iio/imu/bmi160/bmi160.h               |  3 +
 drivers/iio/imu/bmi160/bmi160_core.c          | 46 +++++++++-
 4 files changed, 139 insertions(+), 38 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/iio/imu/bmi160.txt
 create mode 100644 Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml

-- 
2.17.1

[PATCH v4 1/5] dt-bindings: iio: imu: bmi160: convert format to yaml, add maintainer

[Jonathan Albrieux]

Converts documentation from txt format to yaml.

Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
---
 .../devicetree/bindings/iio/imu/bmi160.txt    | 37 ---------
 .../bindings/iio/imu/bosch,bmi160.yaml        | 75 +++++++++++++++++++
 2 files changed, 75 insertions(+), 37 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/iio/imu/bmi160.txt
 create mode 100644 Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml

diff --git a/Documentation/devicetree/bindings/iio/imu/bmi160.txt b/Documentation/devicetree/bindings/iio/imu/bmi160.txt
deleted file mode 100644
index 900c169de00f..000000000000
--- a/Documentation/devicetree/bindings/iio/imu/bmi160.txt
+++ /dev/null
@@ -1,37 +0,0 @@
-Bosch BMI160 - Inertial Measurement Unit with Accelerometer, Gyroscope
-and externally connectable Magnetometer
-
-https://www.bosch-sensortec.com/bst/products/all_products/bmi160
-
-Required properties:
- - compatible : should be "bosch,bmi160"
- - reg : the I2C address or SPI chip select number of the sensor
- - spi-max-frequency : set maximum clock frequency (only for SPI)
-
-Optional properties:
- - interrupts : interrupt mapping for IRQ
- - interrupt-names : set to "INT1" if INT1 pin should be used as interrupt
-   input, set to "INT2" if INT2 pin should be used instead
- - drive-open-drain : set if the specified interrupt pin should be configured as
-   open drain. If not set, defaults to push-pull.
-
-Examples:
-
-bmi160@68 {
-	compatible = "bosch,bmi160";
-	reg = <0x68>;
-
-	interrupt-parent = <&gpio4>;
-	interrupts = <12 IRQ_TYPE_EDGE_RISING>;
-	interrupt-names = "INT1";
-};
-
-bmi160@0 {
-	compatible = "bosch,bmi160";
-	reg = <0>;
-	spi-max-frequency = <10000000>;
-
-	interrupt-parent = <&gpio2>;
-	interrupts = <12 IRQ_TYPE_LEVEL_LOW>;
-	interrupt-names = "INT2";
-};
diff --git a/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
new file mode 100644
index 000000000000..0d0ef84e22b9
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
@@ -0,0 +1,75 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/iio/imu/bosch,bmi160.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Bosch BMI160
+
+maintainers:
+  - Jonathan Cameron <jic23@kernel.org>
+
+description: |
+  Inertial Measurement Unit with Accelerometer, Gyroscope and externally
+  connectable Magnetometer
+  https://www.bosch-sensortec.com/bst/products/all_products/bmi160
+
+properties:
+  compatible:
+    const: bosch,bmi160
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  interrupt-names:
+    enum:
+      - INT1
+      - INT2
+    description: |
+      set to "INT1" if INT1 pin should be used as interrupt input, set
+      to "INT2" if INT2 pin should be used instead
+
+  drive-open-drain:
+    description: |
+      set if the specified interrupt pin should be configured as
+      open drain. If not set, defaults to push-pull.
+
+required:
+  - compatible
+  - reg
+
+examples:
+  - |
+    // Example for I2C
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        bmi160@68 {
+                compatible = "bosch,bmi160";
+                reg = <0x68>;
+                interrupt-parent = <&gpio4>;
+                interrupts = <12 IRQ_TYPE_EDGE_RISING>;
+                interrupt-names = "INT1";
+        };
+    };
+  - |
+    // Example for SPI
+    #include <dt-bindings/interrupt-controller/irq.h>
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        bmi160@0 {
+                compatible = "bosch,bmi160";
+                reg = <0>;
+                spi-max-frequency = <10000000>;
+                interrupt-parent = <&gpio2>;
+                interrupts = <12 IRQ_TYPE_EDGE_RISING>;
+                interrupt-names = "INT2";
+        };
+    };
-- 
2.17.1

[PATCH v4 2/5] dt-bindings: iio: imu: bmi160: add regulators and mount-matrix

[Jonathan Albrieux]

Add vdd-supply and vddio-supply support.
Add mount-matrix support.

Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
---
 .../bindings/iio/imu/bosch,bmi160.yaml           | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
index 0d0ef84e22b9..cfe40dbcd723 100644
--- a/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
+++ b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
@@ -37,6 +37,17 @@ properties:
       set if the specified interrupt pin should be configured as
       open drain. If not set, defaults to push-pull.
 
+  vdd-supply:
+    maxItems: 1
+    description: provide VDD power to the sensor.
+
+  vddio-supply:
+    maxItems: 1
+    description: provide VDD IO power to the sensor.
+
+  mount-matrix:
+    description: an optional 3x3 mounting rotation matrix
+
 required:
   - compatible
   - reg
@@ -52,9 +63,14 @@ examples:
         bmi160@68 {
                 compatible = "bosch,bmi160";
                 reg = <0x68>;
+                vdd-supply = <&pm8916_l17>;
+                vddio-supply = <&pm8916_l6>;
                 interrupt-parent = <&gpio4>;
                 interrupts = <12 IRQ_TYPE_EDGE_RISING>;
                 interrupt-names = "INT1";
+                mount-matrix = "0", "1", "0",
+                               "-1", "0", "0",
+                               "0", "0", "1";
         };
     };
   - |
-- 
2.17.1

[PATCH v4 3/5] iio: imu: bmi160: fix typo

[Jonathan Albrieux]

Fix a typo in MODULE_AUTHOR() argument.

Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
---
 drivers/iio/imu/bmi160/bmi160_core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index 6af65d6f1d28..77b05bd4a2b2 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -853,6 +853,6 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 }
 EXPORT_SYMBOL_GPL(bmi160_core_probe);
 
-MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com");
+MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
 MODULE_DESCRIPTION("Bosch BMI160 driver");
 MODULE_LICENSE("GPL v2");
-- 
2.17.1

[PATCH v4 4/5] iio: imu: bmi160: added regulator support

[Jonathan Albrieux]

Add vdd-supply and vddio-supply support.

While working on an msm8916 device and having explicit declarations for
regulators, without setting these regulators to regulators-always-on it
happened those lines weren't ready because they could have been controlled
by other components, causing failure in module's probe.

This patch aim is to solve this situation by adding regulators control
during bmi160_chip_init() and bmi160_chip_uninit(), assuring power to
this component.

Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
---
 drivers/iio/imu/bmi160/bmi160.h      |  2 ++
 drivers/iio/imu/bmi160/bmi160_core.c | 24 ++++++++++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/drivers/iio/imu/bmi160/bmi160.h b/drivers/iio/imu/bmi160/bmi160.h
index 621f5309d735..923c3b274fde 100644
--- a/drivers/iio/imu/bmi160/bmi160.h
+++ b/drivers/iio/imu/bmi160/bmi160.h
@@ -3,10 +3,12 @@
 #define BMI160_H_
 
 #include <linux/iio/iio.h>
+#include <linux/regulator/consumer.h>
 
 struct bmi160_data {
 	struct regmap *regmap;
 	struct iio_trigger *trig;
+	struct regulator_bulk_data supplies[2];
 };
 
 extern const struct regmap_config bmi160_regmap_config;
diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index 77b05bd4a2b2..d3316ca02fbd 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -15,6 +15,7 @@
 #include <linux/delay.h>
 #include <linux/irq.h>
 #include <linux/of_irq.h>
+#include <linux/regulator/consumer.h>
 
 #include <linux/iio/iio.h>
 #include <linux/iio/triggered_buffer.h>
@@ -709,6 +710,12 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
 	unsigned int val;
 	struct device *dev = regmap_get_device(data->regmap);
 
+	ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies);
+	if (ret) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
 	ret = regmap_write(data->regmap, BMI160_REG_CMD, BMI160_CMD_SOFTRESET);
 	if (ret)
 		return ret;
@@ -793,9 +800,16 @@ int bmi160_probe_trigger(struct iio_dev *indio_dev, int irq, u32 irq_type)
 static void bmi160_chip_uninit(void *data)
 {
 	struct bmi160_data *bmi_data = data;
+	struct device *dev = regmap_get_device(bmi_data->regmap);
+	int ret;
 
 	bmi160_set_mode(bmi_data, BMI160_GYRO, false);
 	bmi160_set_mode(bmi_data, BMI160_ACCEL, false);
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(bmi_data->supplies),
+				     bmi_data->supplies);
+	if (ret)
+		dev_err(dev, "Failed to disable regulators: %d\n", ret);
 }
 
 int bmi160_core_probe(struct device *dev, struct regmap *regmap,
@@ -815,6 +829,16 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 	dev_set_drvdata(dev, indio_dev);
 	data->regmap = regmap;
 
+	data->supplies[0].supply = "vdd";
+	data->supplies[1].supply = "vddio";
+	ret = devm_regulator_bulk_get(dev,
+				      ARRAY_SIZE(data->supplies),
+				      data->supplies);
+	if (ret) {
+		dev_err(dev, "Failed to get regulators: %d\n", ret);
+		return ret;
+	}
+
 	ret = bmi160_chip_init(data, use_spi);
 	if (ret)
 		return ret;
-- 
2.17.1

[PATCH v4 5/5] iio: imu: bmi160: added mount-matrix support

[Jonathan Albrieux]

Add mount-matrix binding support. As chip could have different orientations
a mount matrix support is needed to correctly translate these differences.

Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
---
 drivers/iio/imu/bmi160/bmi160.h      |  1 +
 drivers/iio/imu/bmi160/bmi160_core.c | 20 ++++++++++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/drivers/iio/imu/bmi160/bmi160.h b/drivers/iio/imu/bmi160/bmi160.h
index 923c3b274fde..a82e040bd109 100644
--- a/drivers/iio/imu/bmi160/bmi160.h
+++ b/drivers/iio/imu/bmi160/bmi160.h
@@ -9,6 +9,7 @@ struct bmi160_data {
 	struct regmap *regmap;
 	struct iio_trigger *trig;
 	struct regulator_bulk_data supplies[2];
+	struct iio_mount_matrix orientation;
 };
 
 extern const struct regmap_config bmi160_regmap_config;
diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
index d3316ca02fbd..26d586daee26 100644
--- a/drivers/iio/imu/bmi160/bmi160_core.c
+++ b/drivers/iio/imu/bmi160/bmi160_core.c
@@ -110,6 +110,7 @@
 		.storagebits = 16,				\
 		.endianness = IIO_LE,				\
 	},							\
+	.ext_info = bmi160_ext_info,				\
 }
 
 /* scan indexes follow DATA register order */
@@ -265,6 +266,20 @@ static const struct  bmi160_odr_item bmi160_odr_table[] = {
 	},
 };
 
+static const struct iio_mount_matrix *
+bmi160_get_mount_matrix(const struct iio_dev *indio_dev,
+			const struct iio_chan_spec *chan)
+{
+	struct bmi160_data *data = iio_priv(indio_dev);
+
+	return &data->orientation;
+}
+
+static const struct iio_chan_spec_ext_info bmi160_ext_info[] = {
+	IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmi160_get_mount_matrix),
+	{ }
+};
+
 static const struct iio_chan_spec bmi160_channels[] = {
 	BMI160_CHANNEL(IIO_ACCEL, X, BMI160_SCAN_ACCEL_X),
 	BMI160_CHANNEL(IIO_ACCEL, Y, BMI160_SCAN_ACCEL_Y),
@@ -839,6 +854,11 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
 		return ret;
 	}
 
+	ret = iio_read_mount_matrix(dev, "mount-matrix",
+				    &data->orientation);
+	if (ret)
+		return ret;
+
 	ret = bmi160_chip_init(data, use_spi);
 	if (ret)
 		return ret;
-- 
2.17.1

Re: [PATCH v4 1/5] dt-bindings: iio: imu: bmi160: convert format to yaml, add maintainer

[Rob Herring]

On Mon, 25 May 2020 18:46:00 +0200, Jonathan Albrieux wrote:
> Converts documentation from txt format to yaml.
> 
> Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
> ---
>  .../devicetree/bindings/iio/imu/bmi160.txt    | 37 ---------
>  .../bindings/iio/imu/bosch,bmi160.yaml        | 75 +++++++++++++++++++
>  2 files changed, 75 insertions(+), 37 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/iio/imu/bmi160.txt
>  create mode 100644 Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> 

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

Re: [PATCH v4 2/5] dt-bindings: iio: imu: bmi160: add regulators and mount-matrix

[Rob Herring]

On Mon, May 25, 2020 at 06:46:01PM +0200, Jonathan Albrieux wrote:
> Add vdd-supply and vddio-supply support.
> Add mount-matrix support.
> 
> Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
> ---
>  .../bindings/iio/imu/bosch,bmi160.yaml           | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> index 0d0ef84e22b9..cfe40dbcd723 100644
> --- a/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> +++ b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> @@ -37,6 +37,17 @@ properties:
>        set if the specified interrupt pin should be configured as
>        open drain. If not set, defaults to push-pull.
>  
> +  vdd-supply:
> +    maxItems: 1

Supplies are always a single item, so don't need this.

> +    description: provide VDD power to the sensor.
> +
> +  vddio-supply:
> +    maxItems: 1
> +    description: provide VDD IO power to the sensor.
> +
> +  mount-matrix:
> +    description: an optional 3x3 mounting rotation matrix
> +
>  required:
>    - compatible
>    - reg
> @@ -52,9 +63,14 @@ examples:
>          bmi160@68 {
>                  compatible = "bosch,bmi160";
>                  reg = <0x68>;
> +                vdd-supply = <&pm8916_l17>;
> +                vddio-supply = <&pm8916_l6>;
>                  interrupt-parent = <&gpio4>;
>                  interrupts = <12 IRQ_TYPE_EDGE_RISING>;
>                  interrupt-names = "INT1";
> +                mount-matrix = "0", "1", "0",
> +                               "-1", "0", "0",
> +                               "0", "0", "1";
>          };
>      };
>    - |
> -- 
> 2.17.1
> 

Re: [PATCH v4 1/5] dt-bindings: iio: imu: bmi160: convert format to yaml, add maintainer

[Jonathan Cameron]

On Fri, 29 May 2020 11:08:34 -0600
Rob Herring <robh@kernel.org> wrote:

> On Mon, 25 May 2020 18:46:00 +0200, Jonathan Albrieux wrote:
> > Converts documentation from txt format to yaml.
> > 
> > Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
> > ---
> >  .../devicetree/bindings/iio/imu/bmi160.txt    | 37 ---------
> >  .../bindings/iio/imu/bosch,bmi160.yaml        | 75 +++++++++++++++++++
> >  2 files changed, 75 insertions(+), 37 deletions(-)
> >  delete mode 100644 Documentation/devicetree/bindings/iio/imu/bmi160.txt
> >  create mode 100644 Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> >   
> 
> Reviewed-by: Rob Herring <robh@kernel.org>

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

Thanks,

Jonathan

Re: [PATCH v4 2/5] dt-bindings: iio: imu: bmi160: add regulators and mount-matrix

[Jonathan Cameron]

On Fri, 29 May 2020 11:09:43 -0600
Rob Herring <robh@kernel.org> wrote:

> On Mon, May 25, 2020 at 06:46:01PM +0200, Jonathan Albrieux wrote:
> > Add vdd-supply and vddio-supply support.
> > Add mount-matrix support.
> > 
> > Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
> > ---
> >  .../bindings/iio/imu/bosch,bmi160.yaml           | 16 ++++++++++++++++
> >  1 file changed, 16 insertions(+)
> > 
> > diff --git a/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> > index 0d0ef84e22b9..cfe40dbcd723 100644
> > --- a/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> > +++ b/Documentation/devicetree/bindings/iio/imu/bosch,bmi160.yaml
> > @@ -37,6 +37,17 @@ properties:
> >        set if the specified interrupt pin should be configured as
> >        open drain. If not set, defaults to push-pull.
> >  
> > +  vdd-supply:
> > +    maxItems: 1  
> 
> Supplies are always a single item, so don't need this.

Given this (and case below) were it outstanding for this patch I
fixed them up whilst applying rather than getting Jonathan to
go around again.

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

Thanks,

Jonathan

> 
> > +    description: provide VDD power to the sensor.
> > +
> > +  vddio-supply:
> > +    maxItems: 1
> > +    description: provide VDD IO power to the sensor.
> > +
> > +  mount-matrix:
> > +    description: an optional 3x3 mounting rotation matrix
> > +
> >  required:
> >    - compatible
> >    - reg
> > @@ -52,9 +63,14 @@ examples:
> >          bmi160@68 {
> >                  compatible = "bosch,bmi160";
> >                  reg = <0x68>;
> > +                vdd-supply = <&pm8916_l17>;
> > +                vddio-supply = <&pm8916_l6>;
> >                  interrupt-parent = <&gpio4>;
> >                  interrupts = <12 IRQ_TYPE_EDGE_RISING>;
> >                  interrupt-names = "INT1";
> > +                mount-matrix = "0", "1", "0",
> > +                               "-1", "0", "0",
> > +                               "0", "0", "1";
> >          };
> >      };
> >    - |
> > -- 
> > 2.17.1
> >   

Re: [PATCH v4 3/5] iio: imu: bmi160: fix typo

[Jonathan Cameron]

On Mon, 25 May 2020 18:46:02 +0200
Jonathan Albrieux <jonathan.albrieux@gmail.com> wrote:

> Fix a typo in MODULE_AUTHOR() argument.
> 
> Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>
applied

Thanks,

J
> ---
>  drivers/iio/imu/bmi160/bmi160_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
> index 6af65d6f1d28..77b05bd4a2b2 100644
> --- a/drivers/iio/imu/bmi160/bmi160_core.c
> +++ b/drivers/iio/imu/bmi160/bmi160_core.c
> @@ -853,6 +853,6 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
>  }
>  EXPORT_SYMBOL_GPL(bmi160_core_probe);
>  
> -MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com");
> +MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
>  MODULE_DESCRIPTION("Bosch BMI160 driver");
>  MODULE_LICENSE("GPL v2");

Re: [PATCH v4 4/5] iio: imu: bmi160: added regulator support

[Jonathan Cameron]

On Mon, 25 May 2020 18:46:03 +0200
Jonathan Albrieux <jonathan.albrieux@gmail.com> wrote:

> Add vdd-supply and vddio-supply support.
> 
> While working on an msm8916 device and having explicit declarations for
> regulators, without setting these regulators to regulators-always-on it
> happened those lines weren't ready because they could have been controlled
> by other components, causing failure in module's probe.
> 
> This patch aim is to solve this situation by adding regulators control
> during bmi160_chip_init() and bmi160_chip_uninit(), assuring power to
> this component.
> 
> Signed-off-by: Jonathan Albrieux <jonathan.albrieux@gmail.com>

Applied,

Thanks,

Jonathan

> ---
>  drivers/iio/imu/bmi160/bmi160.h      |  2 ++
>  drivers/iio/imu/bmi160/bmi160_core.c | 24 ++++++++++++++++++++++++
>  2 files changed, 26 insertions(+)
> 
> diff --git a/drivers/iio/imu/bmi160/bmi160.h b/drivers/iio/imu/bmi160/bmi160.h
> index 621f5309d735..923c3b274fde 100644
> --- a/drivers/iio/imu/bmi160/bmi160.h
> +++ b/drivers/iio/imu/bmi160/bmi160.h
> @@ -3,10 +3,12 @@
>  #define BMI160_H_
>  
>  #include <linux/iio/iio.h>
> +#include <linux/regulator/consumer.h>
>  
>  struct bmi160_data {
>  	struct regmap *regmap;
>  	struct iio_trigger *trig;
> +	struct regulator_bulk_data supplies[2];
>  };
>  
>  extern const struct regmap_config bmi160_regmap_config;
> diff --git a/drivers/iio/imu/bmi160/bmi160_core.c b/drivers/iio/imu/bmi160/bmi160_core.c
> index 77b05bd4a2b2..d3316ca02fbd 100644
> --- a/drivers/iio/imu/bmi160/bmi160_core.c
> +++ b/drivers/iio/imu/bmi160/bmi160_core.c
> @@ -15,6 +15,7 @@
>  #include <linux/delay.h>
>  #include <linux/irq.h>
>  #include <linux/of_irq.h>
> +#include <linux/regulator/consumer.h>
>  
>  #include <linux/iio/iio.h>
>  #include <linux/iio/triggered_buffer.h>
> @@ -709,6 +710,12 @@ static int bmi160_chip_init(struct bmi160_data *data, bool use_spi)
>  	unsigned int val;
>  	struct device *dev = regmap_get_device(data->regmap);
>  
> +	ret = regulator_bulk_enable(ARRAY_SIZE(data->supplies), data->supplies);
> +	if (ret) {
> +		dev_err(dev, "Failed to enable regulators: %d\n", ret);
> +		return ret;
> +	}
> +
>  	ret = regmap_write(data->regmap, BMI160_REG_CMD, BMI160_CMD_SOFTRESET);
>  	if (ret)
>  		return ret;
> @@ -793,9 +800,16 @@ int bmi160_probe_trigger(struct iio_dev *indio_dev, int irq, u32 irq_type)
>  static void bmi160_chip_uninit(void *data)
>  {
>  	struct bmi160_data *bmi_data = data;
> +	struct device *dev = regmap_get_device(bmi_data->regmap);
> +	int ret;
>  
>  	bmi160_set_mode(bmi_data, BMI160_GYRO, false);
>  	bmi160_set_mode(bmi_data, BMI160_ACCEL, false);
> +
> +	ret = regulator_bulk_disable(ARRAY_SIZE(bmi_data->supplies),
> +				     bmi_data->supplies);
> +	if (ret)
> +		dev_err(dev, "Failed to disable regulators: %d\n", ret);
>  }
>  
>  int bmi160_core_probe(struct device *dev, struct regmap *regmap,
> @@ -815,6 +829,16 @@ int bmi160_core_probe(struct device *dev, struct regmap *regmap,
>  	dev_set_drvdata(dev, indio_dev);
>  	data->regmap = regmap;
>  
> +	data->supplies[0].supply = "vdd";
> +	data->supplies[1].supply = "vddio";
> +	ret = devm_regulator_bulk_get(dev,
> +				      ARRAY_SIZE(data->supplies),
> +				      data->supplies);
> +	if (ret) {
> +		dev_err(dev, "Failed to get regulators: %d\n", ret);
> +		return ret;
> +	}
> +
>  	ret = bmi160_chip_init(data, use_spi);
>  	if (ret)
>  		return ret;