linux-kernel - Re: [PATCH v6 2/8] regulator: dt-bindings: Document max8997-pmic nodes

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Date:   Fri, 15 Jan 2021 13:42:14 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Timon Baetz <timon.baetz@...tonmail.com>
Cc:     Krzysztof Kozlowski <krzk@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Lee Jones <lee.jones@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-pm@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht
Subject: Re: [PATCH v6 2/8] regulator: dt-bindings: Document max8997-pmic
 nodes

On Fri, Jan 15, 2021 at 06:19:28AM +0000, Timon Baetz wrote:
> On Fri, 8 Jan 2021 16:16:53 +0000, Mark Brown wrote:
> > On Fri, Jan 08, 2021 at 03:16:48PM +0000, Timon Baetz wrote:

> > > Muic needs a node to be used with extcon_get_edev_by_phandle().
> > > Charger needs a node to reference a regulator.  

> > The pattern is to use the parent device's node.

> So is extcon going to be a self-reference then?

I guess, assuming you even need to look this up via the device tree.

> Just for my understanding: I can see sub-nodes for MFD all over the
> place. It is still not clear to me why sub-nodes aren't the right
> choice in this specific case?

They probably aren't the right choice for a lot of the other usages
either, there's a great tendency to just encode the specific way that
Linux currently handles things into the DT without really thinking about
what it means.

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