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

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Date:   Wed, 14 Jun 2023 08:36:47 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Matti Vaittinen <mazziesaccount@...il.com>,
        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 14/06/2023 07:32, Matti Vaittinen wrote:
>>> +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.
> 
If the device actually requires a regulator, it should be required by
the bindings, even if it leads to dummies or fixed regulators on the
board DTS.

Best regards,
Krzysztof