Re: [PATCH 5/5] dt-bindings: iio: Add adis16475 documentation

[Jonathan Cameron <jic23@kernel.org>]

On Tue, 25 Feb 2020 13:41:52 +0100
Nuno Sá <nuno.sa@analog.com> wrote:

> Document the ADIS16475 device devicetree bindings.
> 
> Signed-off-by: Nuno Sá <nuno.sa@analog.com>

One thing inline on the burst mode stuff.

Thanks,

Jonathan

> ---
>  .../bindings/iio/imu/adi,adis16475.yaml       | 130 ++++++++++++++++++
>  MAINTAINERS                                   |   1 +
>  2 files changed, 131 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/imu/adi,adis16475.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/imu/adi,adis16475.yaml b/Documentation/devicetree/bindings/iio/imu/adi,adis16475.yaml
> new file mode 100644
> index 000000000000..c0f2146e000c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/imu/adi,adis16475.yaml
> @@ -0,0 +1,130 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/imu/adi,adis16475.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices ADIS16475 and similar IMUs
> +
> +maintainers:
> +  - Nuno Sá <nuno.sa@analog.com>
> +
> +description: |
> +  Analog Devices ADIS16475 and similar IMUs
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/ADIS16475.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,adis16475-1
> +      - adi,adis16475-2
> +      - adi,adis16475-3
> +      - adi,adis16477-1
> +      - adi,adis16477-2
> +      - adi,adis16477-3
> +      - adi,adis16470
> +      - adi,adis16465-1
> +      - adi,adis16465-2
> +      - adi,adis16465-3
> +      - adi,adis16467-1
> +      - adi,adis16467-2
> +      - adi,adis16467-3
> +      - adi,adis16500
> +      - adi,adis16505-1
> +      - adi,adis16505-2
> +      - adi,adis16505-3
> +      - adi,adis16507-1
> +      - adi,adis16507-2
> +      - adi,adis16507-3
> +
> +  reg:
> +    maxItems: 1
> +
> +  spi-cpha: true
> +
> +  spi-cpol: true
> +
> +  spi-max-frequency:
> +    maximum: 2000000
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  clocks:
> +    maxItems: 1
> +
> +  clock-names:
> +    oneOf:
> +      - const: sync
> +      - const: direct-sync
> +      - const: pulse-sync
> +      - const: scaled-sync
> +
> +  reset-gpios:
> +    description:
> +      Must be the device tree identifier of the RESET pin. If specified,
> +      it will be asserted during driver probe. As the line is active low,
> +      it should be marked GPIO_ACTIVE_LOW.
> +    maxItems: 1
> +
> +  adi,scaled-output-hz:
> +    description:
> +      This property must be present if the clock mode is scaled-sync through
> +      clock-names property. In this mode, the input clock can have a range
> +      of 1Hz to 128HZ which must be scaled to originate an allowable sample
> +      rate. This property specifies that rate.
> +    minimum: 1900
> +    maximum: 2100
> +
> +required:
> +  - compatible
> +  - reg
> +  - interrupts
> +  - spi-cpha
> +  - spi-cpol
> +
> +if:
> +  properties:
> +    compatible:
> +      contains:
> +        enum:
> +          - adi,adis16500
> +          - adi,adis16505-1
> +          - adi,adis16505-2
> +          - adi,adis16505-3
> +          - adi,adis16507-1
> +          - adi,adis16507-2
> +          - adi,adis16507-3
> +
> +then:
> +  properties:
> +    clock-names:
> +      oneOf:
> +        - const: sync
> +        - const: direct-sync
> +        - const: scaled-sync
> +
> +    adi,burst32-enable:
> +      description:
> +        Enable burst32 mode. In this mode, a burst reading contains calibrated
> +        gyroscope and accelerometer data in 32-bit format.

Why is this in DT?  Is it not a runtime decision
(ideally automatically selected)

> +      type: boolean
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    spi {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            adis16475: adis16475-3@0 {
> +                    compatible = "adi,adis16475-3";
> +                    reg = <0>;
> +                    spi-cpha;
> +                    spi-cpol;
> +                    spi-max-frequency = <2000000>;
> +                    interrupts = <4 IRQ_TYPE_EDGE_RISING>;
> +                    interrupt-parent = <&gpio>;
> +            };
> +    };
> +...
> diff --git a/MAINTAINERS b/MAINTAINERS
> index f11262f1f3bb..f8ccc92ab378 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -1015,6 +1015,7 @@ W:	http://ez.analog.com/community/linux-device-drivers
>  S:	Supported
>  F:	drivers/iio/imu/adis16475.c
>  F:	Documentation/ABI/testing/sysfs-bus-iio-imu-adis16475
> +F:	Documentation/devicetree/bindings/iio/imu/adi,adis16475.yaml
>  
>  ANALOG DEVICES INC ADM1177 DRIVER
>  M:	Beniamin Bia <beniamin.bia@analog.com>