linux-kernel - Re: [PATCH v5 04/11] clocksource/drivers: Add HPE GXP timer

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Date:   Wed, 27 Apr 2022 00:26:28 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Rob Herring <robh@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>,
        "Hawkins, Nick" <nick.hawkins@....com>,
        "Verdun, Jean-Marie" <verdun@....com>,
        Joel Stanley <joel@....id.au>,
        OpenBMC Maillist <openbmc@...ts.ozlabs.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 04/11] clocksource/drivers: Add HPE GXP timer

On Wed, Apr 27, 2022 at 12:04 AM Rob Herring <robh@...nel.org> wrote:
>
> On Tue, Apr 26, 2022 at 4:55 PM Arnd Bergmann <arnd@...db.de> wrote:
> >
> > On Tue, Apr 26, 2022 at 11:38 PM Rob Herring <robh@...nel.org> wrote:
> > > On Tue, Apr 26, 2022 at 08:00:20AM +0200, Arnd Bergmann wrote:
> > > > On Mon, Apr 25, 2022 at 10:38 PM Linus Walleij <linus.walleij@...aro.org> wrote:
> >
> > > > There are multiple ways of doing this that we already discussed
> > > > in the thread. The easiest is probably to have a child node without
> > > > custom registers in the DT and then use the DT helpers to
> > > > populate the linux devices with the correct data.
> > >
> > > I think that's what the wdt binding is doing, but I don't like that.
> > > Maybe it's not a child node, I can't tell.
> > >
> > > Bindings should not be decided on the *current* driver split on one
> > > particular OS. This looks like 1 block, so 1 node.
> >
> > Fair enough.
> >
> > > If that doesn't work well or easy for Linux, then we should fix Linux.
> >
> > Doing a simple platform_device_create_pdata() should work fine here,
> > the only problem that might exist is if the wdt driver needs access to
> > DT properties, as we can't have both devices refer to the same of_node
> > pointer,
>
> Why not? There's even a struct device flag for that.

Ah, I forgot about ->of_node_reused, that should work then if
it needs access to properties.

        Arnd