linux-kernel - Re: [PATCH v2] dt-bindings: iio: accel: Add bmi088 accelerometer bindings

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Date:   Sat, 28 Mar 2020 16:56:32 +0100
From:   Mike Looijmans <mike.looijmans@...ic.nl>
To:     Jonathan Cameron <jic23@...nel.org>
CC:     devicetree@...r.kernel.org, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net, robh+dt@...nel.org, mark.rutland@....com
Subject: Re: [PATCH v2] dt-bindings: iio: accel: Add bmi088 accelerometer
 bindings

Interleaved comments below.

I'll send a v6 bundle with the updated bindings.

On 28-03-2020 16:19, Jonathan Cameron wrote:
> On Mon, 23 Mar 2020 10:55:51 +0100
> Mike Looijmans <mike.looijmans@...ic.nl> wrote:
> 
>> This adds the device-tree bindings for the Bosch Sensortec BMI088 IMU,
>> the accelerometer part.
>>
>> Signed-off-by: Mike Looijmans <mike.looijmans@...ic.nl>
> Hi Mike
> 
> The binding should look to be as complete as possible, independent on what
> we are actually using in the driver.
> 
> A quick glance at the datasheet shows me this device has 2 interrupt lines
> dedicated to the accelerometer and 2 power supplies, vddio and vdd.
> 
> Interrupt lines for flexible parts like this are fiddly to do, so take
> a look at how we do this in other drivers.  Hmm. the interrupt line to set
> a tag is 'interesting'.  I'd ignore that for now...

Guess for the interrupts we can just suffice to say that MaxItems=2 and 
it's up to the driver to make sense of things. Power supplies are clear.


> 
>> ---
>> v2: convert to yaml format
>>
>>   .../bindings/iio/accel/bosch,bmi088.yaml      | 38 +++++++++++++++++++
>>   1 file changed, 38 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/iio/accel/bosch,bmi088.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/iio/accel/bosch,bmi088.yaml b/Documentation/devicetree/bindings/iio/accel/bosch,bmi088.yaml
>> new file mode 100644
>> index 000000000000..715f79c3b2a9
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/accel/bosch,bmi088.yaml
>> @@ -0,0 +1,38 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/iio/accel/bosch,bma400.yaml#
> 
> Should reflect the compatible so include the accel part.

Oops, copy/paste error...

> 
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: Bosch BMI088 IMU accelerometer part
>> +
>> +maintainers:
>> +  - Mike Looijmans <mike.looijmans@...ic.nl>
>> +
>> +description: |
>> +  Acceleration part of the IMU sensor with an SPI interface
>> +
>> +  Specifications about the sensor can be found at:
>> +    https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi088-ds001.pdf
>> +
>> +properties:
>> +  compatible:
>> +    enum:
>> +      - bosch,bmi088_accel
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +examples:
>> +  - |
>> +  spi {
>> +    bmi088_accel@1 {
>> +      compatible = "bosch,bmi088_accel";
>> +      reg = <1>;
>> +      spi-max-frequency = <10000000>;
>> +    };
>> +  };
> 


-- 
Mike Looijmans