linux-kernel - Re: [PATCH v2 2/4] mfd: Add RZ/V2M PWC core driver

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Message-ID: <Y7WjrrSvLanjNhyX@google.com>
Date:   Wed, 4 Jan 2023 16:05:02 +0000
From:   Lee Jones <lee@...nel.org>
To:     Fabrizio Castro <fabrizio.castro.jz@...esas.com>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <brgl@...ev.pl>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Sebastian Reichel <sre@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        "linux-renesas-soc@...r.kernel.org" 
        <linux-renesas-soc@...r.kernel.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Jacopo Mondi <jacopo@...ndi.org>
Subject: Re: [PATCH v2 2/4] mfd: Add RZ/V2M PWC core driver

> > > > If you do not have any resources to share, you can simply register
> > each
> > > > of the devices via Device Tree.  I do not see a valid reason to force
> > a
> > > > parent / child relationship for your use-case.
> > >
> > > There would probably be overlapping on the same memory region, which
> > would
> > > lead to ioremapping the same region multiple times, which is something
> > > I would prefer to avoid if possible.
> > 
> > Okay, so you *do* have shared resources.
> > 
> > In which case, why is simple-mfd not working for you?
> 
> The corresponding dt-bindings got rejected, unfortunately. I had to drop
> simple-mfd as a result of dropping the children of my simple-mfd DT node.

You have to write DT bindings to be OS agnostic.

They *must* match the H/W.  Little else matters.

How we interpret those in Linux is flexible however.

-- 
Lee Jones [李琼斯]