linux-kernel - Re: [PATCH v2 2/8] dt-bindings: arm: apple: Add apple,pmgr binding

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Date:   Wed, 27 Oct 2021 16:51:56 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Hector Martin <marcan@...can.st>
Cc:     Rob Herring <robh@...nel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Marc Zyngier <maz@...nel.org>, Arnd Bergmann <arnd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mark Kettenis <mark.kettenis@...all.nl>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Johan Hovold <johan@...nel.org>, devicetree@...r.kernel.org,
        "open list:THERMAL" <linux-pm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
        "open list:SERIAL DRIVERS" <linux-serial@...r.kernel.org>,
        Mark Kettenis <kettenis@...nbsd.org>
Subject: Re: [PATCH v2 2/8] dt-bindings: arm: apple: Add apple,pmgr binding

On Wed, 27 Oct 2021 at 16:44, Rob Herring <robh@...nel.org> wrote:
>
> On Tue, Oct 26, 2021 at 10:38 PM Hector Martin <marcan@...can.st> wrote:
> >
> > On 27/10/2021 03.25, Rob Herring wrote:
> > > On Mon, Oct 25, 2021 at 11:47:12PM +0900, Hector Martin wrote:
> > >> +  compatible:
> > >> +    items:
> > >> +      - enum:
> > >> +          - apple,t8103-pmgr
> > >> +          - apple,t8103-minipmgr
> > >> +      - const: apple,pmgr
> > >> +      - const: syscon
> > >> +      - const: simple-mfd
> > >
> > >
> > > 'simple-mfd' means 'there's nothing in this node that any of the child
> > > nodes depend on'. You should be somewhat certain as dropping it later
> > > creates compatibility issues.
> >
> > Hmm, I see simple-mfd turns this into a bus which I guess allows child
> > nodes to be probed without the parent node doing anything special (then
> > we use syscon_node_to_regmap to get the syscon instantiated). Do you
> > have a example use case for doing this without simple-mfd?
>
> Drivers calling of_platform_populate or devm_of_platform_populate.
>
> That of course does mean you need a driver. We could probably make the
> syscon driver call these if needed.
>

Hi Hector,

I thought I mentioned this with your v1, maybe the comment got lost.
We have it for Exynos PMU:
drivers/soc/samsung/exynos-pmu.c
arch/arm/boot/dts/exynos-syscon-restart.dtsi (extending node from
arch/arm/boot/dts/exynos5420.dtsi)
Maybe you can base on that.

Best regards,
Krzysztof