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Message-ID: <28cba091-48d0-846d-4996-64e71be275f2@linaro.org>
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
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