linux-kernel - Re: [PATCH 2/6] dt-bindings: regulator: Add reg-external-output binding

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Date:   Thu, 5 May 2022 10:33:22 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Zev Weiss <zev@...ilderbeest.net>, Mark Brown <broonie@...nel.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        openbmc@...ts.ozlabs.org
Subject: Re: [PATCH 2/6] dt-bindings: regulator: Add reg-external-output
 binding

On 04/05/2022 22:33, Zev Weiss wrote:
> On Wed, May 04, 2022 at 05:55:53AM PDT, Mark Brown wrote:
>> On Tue, May 03, 2022 at 11:52:48PM -0700, Zev Weiss wrote:
>>> This describes an external output supplied by a regulator, such as a
>>> power outlet on a power distribution unit (PDU).
>>
>> OK, so this is that represnetation of the connection - which raises the
>> question about why the regulator needs a property?

This remained unanswered... the binding looks like approach the problem
from wrong side. It's like defining consumers of clock inside clock
controller. It does not scale, it's not in Devicetree style/intentions.

You should have a dedicated port or connector which takes a regulator as
a supply (and for supply we already have bindings).

We already have only one connector:
git grep connector -- Documentation/devicetree/


(extcon is not the best choice for bindings, it's tied to Linux
implementation, not to hardware)

Best regards,
Krzysztof