linux-kernel - Re: [PATCH 1/2] dt-bindings: iio: magnetometer: add ti tmag5273 documentation file

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Date:   Tue, 15 Nov 2022 09:21:13 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Gerald Loacker <gerald.loacker@...fvision.net>,
        linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Jonathan Cameron <jic23@...nel.org>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>,
        Jakob Hauser <jahau@...ketmail.com>,
        Michael Riesch <michael.riesch@...fvision.net>
Subject: Re: [PATCH 1/2] dt-bindings: iio: magnetometer: add ti tmag5273
 documentation file

On 15/11/2022 08:37, Gerald Loacker wrote:
> Add bindings documentation file for TI TMAG5273.

Subject - drop "documentation file".

> 
> Signed-off-by: Gerald Loacker <gerald.loacker@...fvision.net>
> ---
>  .../iio/magnetometer/ti,tmag5273.yaml         | 72 +++++++++++++++++++
>  MAINTAINERS                                   |  6 ++
>  2 files changed, 78 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/iio/magnetometer/ti,tmag5273.yaml
> 
> diff --git a/Documentation/devicetree/bindings/iio/magnetometer/ti,tmag5273.yaml b/Documentation/devicetree/bindings/iio/magnetometer/ti,tmag5273.yaml
> new file mode 100644
> index 000000000000..2f5b0a4d2f40
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/magnetometer/ti,tmag5273.yaml
> @@ -0,0 +1,72 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/iio/magnetometer/ti,tmag5273.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI TMAG5273 Low-Power Linear 3D Hall-Effect Sensor
> +
> +maintainers:
> +  - Gerald Loacker <gerald.loacker@...fvision.net>
> +
> +description:
> +  The TI TMAG5273 is a low-power linear 3D Hall-effect sensor. This device
> +  integrates three independent Hall-effect sensors in the X, Y, and Z axes.
> +  The device has an integrated temperature sensor available. The TMAG5273
> +  can be configured through the I2C interface to enable any combination of
> +  magnetic axes and temperature measurements. An integrated angle calculation
> +  engine (CORDIC) provides full 360° angular position information for both
> +  on-axis and off-axis angle measurement topologies. The angle calculation is
> +  performed using two user-selected magnetic axes.
> +
> +properties:
> +  $nodename:
> +    pattern: '^magnetometer@[0-9a-f]+$'

Device schemas do not need to enforce the names.

> +
> +  compatible:
> +    const: ti,tmag5273
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#io-channel-cells":
> +    const: 1
> +
> +  ti,angle-enable:

ti,angle-measurement

> +    description:
> +      Enables angle measurement in the selected plane.
> +      0 = OFF
> +      1 = X-Y (default)
> +      2 = Y-Z
> +      3 = X-Z

Why not strings which are easier for humans? off/x-y/y-z/x-z? How anyone
reading DTS can remember what is "3" in this and in thousands of other
devices?

> +    $ref: /schemas/types.yaml#/definitions/uint32
> +    minimum: 0
> +    maximum: 3

default: 1

> +
> +  vcc-supply:
> +    description:
> +      A regulator providing 1.7 V to 3.6 V supply voltage on the VCC pin,
> +      typically 3.3 V.
> +
> +required:
> +  - compatible
> +  - reg
> +  - vcc-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c-0 {

Just: i2c


Best regards,
Krzysztof