linux-kernel - Re: [PATCH v6 1/2] dt-bindings: iio: accel: Add bmi088 accelerometer bindings

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Message-ID: <6a9dd87d-06f4-3a9b-ce03-08df15d6c2f6@topic.nl>
Date:   Thu, 21 Jan 2021 09:46:19 +0100
From:   Mike Looijmans <mike.looijmans@...ic.nl>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>
CC:     linux-iio@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Rob Herring <robh+dt@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 1/2] dt-bindings: iio: accel: Add bmi088 accelerometer
 bindings

Comments inlined below.


Met vriendelijke groet / kind regards,

Mike Looijmans
System Expert


TOPIC Embedded Products B.V.
Materiaalweg 4, 5681 RJ Best
The Netherlands

T: +31 (0) 499 33 69 69
E: mike.looijmans@...icproducts.com
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On 20-01-2021 19:50, Jonathan Cameron wrote:
> On Tue, 19 Jan 2021 13:46:21 +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>
>>
>> ---
>>
>> Changes in v6:
>> I't been almost a year since the last commit, sorry...
> No problem. Happens to us all sometimes!
> 
> One thing inline below.
> 
> Thanks,
> 
> Jonathan
> 
>> Fixed the yaml errors
>> Add interrupt, vdd and vddio properties
>>
>> Changes in v5:
>> submit together with driver code as patch series
>>
>> Changes in v2:
>> convert to yaml format
>>
>>   .../bindings/iio/accel/bosch,bmi088.yaml      | 55 +++++++++++++++++++
>>   1 file changed, 55 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..459b9969fd12
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/accel/bosch,bmi088.yaml
>> @@ -0,0 +1,55 @@
>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/iio/accel/bosch,bmi088.yaml#
>> +$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
>> +
>> +  vdd-supply: true
>> +
>> +  vddio-supply: true
>> +
>> +  interrupts:
>> +    minItems: 1
>> +    maxItems: 2
>> +    description: |
>> +      Type should be either IRQ_TYPE_LEVEL_HIGH or IRQ_TYPE_LEVEL_LOW.
>> +      The first interrupt listed must be the one connected to the INT1 pin, the
>> +      second must be the one connected to the INT2 pin.
> 
> What if the board only has the INT2 pin connected?
> That's looks to be a valid hardware configuration.
> 
> I'd suggest using interrupt-names to cover this.

Yeah makes sense. The pins have the same functionality, so either one will do.

> 
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +examples:
>> +  - |
>> +    #include <dt-bindings/interrupt-controller/irq.h>
>> +    spi {
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +      bmi088_accel@1 {
>> +        compatible = "bosch,bmi088_accel";
>> +        reg = <1>;
>> +        spi-max-frequency = <10000000>;
>> +        interrupt-parent = <&gpio6>;
>> +        interrupts = <19 IRQ_TYPE_LEVEL_LOW>;
>> +      };
>> +    };
>> +...
>