linux-kernel - Re: Unclear what to do with compatibility

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Message-ID: <081a71b2-951b-76bc-82d5-687a9942450a@linaro.org>
Date:   Thu, 13 Apr 2023 14:51:31 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Daniel Matyas <daniel.matyas@...log.com>
Cc:     corbet@....net, devicetree@...r.kernel.org, jdelvare@...e.com,
        krzysztof.kozlowski+dt@...aro.org, linux-doc@...r.kernel.org,
        linux-hwmon@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux@...ck-us.net, robh+dt@...nel.org
Subject: Re: Unclear what to do with compatibility

On 13/04/2023 14:30, Daniel Matyas wrote:
> MAX31827 is a low-power temperature switch with I2C interface.

You sent a new patch. With a weird subject. I don't understand exactly
what is this.

> 
> The device is a ±1°C accuracy from -40°C to +125°C
> (12 bits) local temperature switch and sensor with I2C/SM-
> Bus interface. The combination of small 6-bump wafer-lev-
> el package (WLP) and high accuracy makes this temper-
> ature sensor/switch ideal for a wide range of applications.
> 
> Signed-off-by: Daniel Matyas <daniel.matyas@...log.com>
> ---
>  .../bindings/hwmon/adi,max31827.yaml          | 51 +++++++++++++++++++
>  MAINTAINERS                                   |  7 +++
>  2 files changed, 58 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> 
> diff --git a/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> new file mode 100644
> index 000000000000..37177eb9c039
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/hwmon/adi,max31827.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/hwmon/adi,max31827.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch
> +
> +maintainers:
> +  - Daniel Matyas <daniel.matyas@...log.com>
> +
> +description: |
> +  Analog Devices MAX31827, MAX31828, MAX31829 Low-Power Temperature Switch with
> +  I2C Interface
> +  https://www.analog.com/media/en/technical-documentation/data-sheets/MAX31827-MAX31829.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - adi,max31827
> +      - adi,max31828
> +      - adi,max31829
> +
> 
> I am really sorry, but I do not understand what I should do.
> 
> Should I add oneOf or items to the compatibility property?

The devices should be marked as compatible with each other, so you can
drop useless match table entries.

https://elixir.bootlin.com/linux/v6.3-rc6/source/Documentation/devicetree/bindings/sound/nvidia,tegra210-ope.yaml#L31

and fix this in the driver.


Best regards,
Krzysztof