linux-kernel - Re: [PATCH 1/3] dt-bindings: ROHM BU27010 RGBC + flickering sensor

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Date:   Wed, 14 Jun 2023 08:32:27 +0300
From:   Matti Vaittinen <mazziesaccount@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
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>,
        Conor Dooley <conor+dt@...nel.org>, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] dt-bindings: ROHM BU27010 RGBC + flickering sensor

On 6/13/23 21:42, Krzysztof Kozlowski wrote:
> On 13/06/2023 12:19, Matti Vaittinen wrote:
>> The ROHM BU27010 is a sensor with 6 photodiodes (red, green, blue, clear,
>> IR and flickering detection) with five configurable channels. Red, green
>> and flickering detection being always available and two out of the rest
>> three (blue, clear, IR) can be selected to be simultaneously measured.
>> Typical application is adjusting LCD/OLED backlight of TVs, mobile phones
>> and tablet PCs.
> 
> Please use subject prefixes matching the subsystem. You can get them for
> example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
> your patch is touching.
> e.g.: "dt-bindings: iio:"
> 

Right, thanks!

> 
>>
>> Add binding document for ROHM BU27010.
>>
>> Signed-off-by: Matti Vaittinen <mazziesaccount@...il.com>
>> ---
>>   .../bindings/iio/light/rohm,bu27010.yaml      | 49 +++++++++++++++++++
>>   1 file changed, 49 insertions(+)
>>   create mode 100644 Documentation/devicetree/bindings/iio/light/rohm,bu27010.yaml
>>
>> diff --git a/Documentation/devicetree/bindings/iio/light/rohm,bu27010.yaml b/Documentation/devicetree/bindings/iio/light/rohm,bu27010.yaml
>> new file mode 100644
>> index 000000000000..2bde9d2f1def
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/light/rohm,bu27010.yaml
>> @@ -0,0 +1,49 @@
>> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
>> +%YAML 1.2
>> +---
>> +$id: http://devicetree.org/schemas/iio/light/rohm,bu27010.yaml#
>> +$schema: http://devicetree.org/meta-schemas/core.yaml#
>> +
>> +title: ROHM BU27010 color sensor
>> +
>> +maintainers:
>> +  - Matti Vaittinen <mazziesaccount@...il.com>
>> +
>> +description: |
>> +  The ROHM BU27010 is a sensor with 6 photodiodes (red, green, blue, clear,
>> +  IR and flickering detection) with five configurable channels. Red, green
>> +  and flickering detection being always available and two out of the rest
>> +  three (blue, clear, IR) can be selected to be simultaneously measured.
>> +  Typical application is adjusting LCD/OLED backlight of TVs, mobile phones
>> +  and tablet PCs.
>> +
>> +properties:
>> +  compatible:
>> +    const: rohm,bu27010
>> +
>> +  reg:
>> +    maxItems: 1
>> +
>> +  interrupts:
>> +    maxItems: 1
>> +
>> +  vdd-supply: true
> 
> Isn't vdd-supply required for the hardware to work? How does it get the
> power otherwise?

The BU27010 works by magic smoke. When smoke leaks out the sensor no 
longer works.

Ehh, I think you are right. My thinking was that it is not uncommon for 
people to not have all fixed regulators present in device-tree. But I 
agree, this does not mean we should encourage that. I'll add supply to 
the list of the required properties.

> 
>> +
>> +required:
>> +  - compatible
>> +  - reg
>> +
>> +additionalProperties: false
>> +
>> +examples:
>> +  - |
>> +    i2c {
>> +      #address-cells = <1>;
>> +      #size-cells = <0>;
>> +
>> +      light-sensor@38 {
>> +        compatible = "rohm,bu27010";
>> +        reg = <0x38>;
>> +      };
>> +    };
>> +
> 
> Trailing blank line.

Indeed. Thanks.

Yours,
	-- Matti

-- 
Matti Vaittinen
Linux kernel developer at ROHM Semiconductors
Oulu Finland

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