linux-kernel - Re: [PATCH] ARM: dts: turris-omnia: Add mcu node

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Date:   Sun, 4 Sep 2022 03:02:56 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     Pali Rohár <pali@...nel.org>
Cc:     Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Marek Behun <marek.behun@....cz>,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ARM: dts: turris-omnia: Add mcu node

> > I'm also not sure what the DT people will say about the node name mcu.
> > I don't see any examples of that in the binding documentation. They
> > might request you rename it to gpio-controller, unless it does more
> > than GPIO? And if it does do more than GPIO we are then into mfd
> > territory, and the binding then becomes much more interesting. Then we
> > start the questions, are you defining a ABI now, before there is even
> > a driver for it?
> > 
> >        Andrew
> 
> Yes, there is already driver. See my previous email, I mentioned it and
> also I wrote link for this driver. Moreover now driver is merged in
> upstream u-boot.

I'm not comfortable accepting a DT binding for a driver which does not
exist in Linux. As i said, there are interesting ABI issues here, and
it could be the MFD, GPIO or reset Maintainers don't accept a binding
until a Linux driver exists.

At minimum, you need an Acked-by from the GPIO Maintainer, of the
binding before this DT change is merged via MVEBU.

	Andrew