linux-kernel - Re: [PATCH 11/12] dt-bindings: iio: imu: Add inv

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Date:   Thu, 14 May 2020 22:00:02 -0500
From:   Rob Herring <robh@...nel.org>
To:     Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>
Cc:     jic23@...nel.org, mchehab+huawei@...nel.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/12] dt-bindings: iio: imu: Add inv_icm42600
 documentation

On Thu, May 07, 2020 at 04:42:21PM +0200, Jean-Baptiste Maneyrol wrote:
> Document the ICM-426xxx devices devicetree bindings.
> 
> Signed-off-by: Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>
> ---
>  .../bindings/iio/imu/invensense,icm42600.yaml | 90 +++++++++++++++++++
>  1 file changed, 90 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/imu/invensense,icm42600.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/imu/invensense,icm42600.yaml b/Documentation/devicetree/bindings/iio/imu/invensense,icm42600.yaml
> new file mode 100644
> index 000000000000..a7175f6543fa
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/imu/invensense,icm42600.yaml
> @@ -0,0 +1,90 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/imu/invensense,icm42600.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: InvenSense ICM-426xx Inertial Measurement Unit
> +
> +maintainers:
> +  - Jean-Baptiste Maneyrol <jmaneyrol@...ensense.com>
> +
> +description: |
> +  6-axis MotionTracking device that combines a 3-axis gyroscope and a 3-axis accelerometer.
> +
> +  It has a configurable host interface that supports I3C, I2C and SPI serial communication, features a 2kB FIFO and
> +  2 programmable interrupts with ultra-low-power wake-on-motion support to minimize system power consumption.
> +
> +  Other industry-leading features include InvenSense on-chip APEX Motion Processing engine for gesture recognition,
> +  activity classification, and pedometer, along with programmable digital filters, and an embedded temperature sensor.
> +
> +  https://invensense.tdk.com/wp-content/uploads/2020/03/DS-000292-ICM-42605-v1.4.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - invensense,icm42600
> +      - invensense,icm42602
> +      - invensense,icm42605
> +      - invensense,icm42622
> +
> +  reg:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  spi-cpha: true
> +
> +  spi-cpol: true

It doesn't make much sense to specify these and not make them required. 
I guess you could have a device with multiple modes, but generally 
there's only one right combination of these properties. Also, this could 
just be implied by the compatible.

> +
> +  spi-max-frequency:
> +    maxItems: 1

Not an array. Either give a frequency range (minimum/maximum) or just 
'true'.

> +
> +  vdd-supply:
> +    description: Regulator that provides power to the sensor
> +
> +  vddio-supply:
> +    description: Regulator that provides power to the bus
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    i2c0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        icm42605@68 {
> +          compatible = "invensense,icm42605";
> +          reg = <0x68>;
> +          interrupt-parent = <&gpio2>;
> +          interrupts = <7 IRQ_TYPE_EDGE_FALLING>;
> +          vdd-supply = <&vdd>;
> +          vddio-supply = <&vddio>;
> +        };
> +    };
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    spi0 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        icm42602@0 {
> +          compatible = "invensense,icm42602";
> +          reg = <0>;
> +          spi-max-frequency = <24000000>;
> +          spi-cpha;
> +          spi-cpol;
> +          interrupt-parent = <&gpio1>;
> +          interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
> +          vdd-supply = <&vdd>;
> +          vddio-supply = <&vddio>;
> +        };
> +    };
> -- 
> 2.17.1
>