linux-kernel - Re: [PATCH v5 2/6] dt-bindings: PCI: renesas,pci-rcar-gen2: Add device tree support for r9a06g032

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Message-ID: <CAMuHMdWktaRAw8Y6TR93_rH8v4mPR2yt3wGqeXeTA2p_Dh--wA@mail.gmail.com>
Date:   Tue, 3 May 2022 08:51:19 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Rob Herring <robh@...nel.org>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Herve Codina <herve.codina@...tlin.com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        linux-pci <linux-pci@...r.kernel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Clement Leger <clement.leger@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: Re: [PATCH v5 2/6] dt-bindings: PCI: renesas,pci-rcar-gen2: Add
 device tree support for r9a06g032

Hi Rob,

On Mon, May 2, 2022 at 9:44 PM Rob Herring <robh@...nel.org> wrote:
> On Mon, May 02, 2022 at 11:19:19AM +0200, Geert Uytterhoeven wrote:
> > On Sun, May 1, 2022 at 10:51 AM Krzysztof Kozlowski
> > <krzysztof.kozlowski@...aro.org> wrote:
> > > On 29/04/2022 15:41, Herve Codina wrote:
> > > > Add internal PCI bridge support for the r9a06g032 SOC. The Renesas
> > > > RZ/N1D (R9A06G032) internal PCI bridge is compatible with the one
> > > > present in the R-Car Gen2 family.
> > > > Compared to the R-Car Gen2 family, it needs three clocks instead of
> > > > one.
> > > >
> > > > The 'resets' property for the RZ/N1 family is not required since
> > > > there is no reset-controller support yet for the RZ/N1 family.
> > >
> > > This should not be a reason why a property is or is not required. Either
> > > this is required for device operation or not. If it is required, should
> > > be in the bindings. Otherwise what are you going to do in the future?
> > > Add a required property breaking the ABI?
> >
> > The problem is that there are no bindings for the reset controller
> > (actually the reset controller feature of the system-controller) yet.
> > Yeah, we can just add #reset-cells = <1> to the system-controller
> > device node, but we cannot add the actual resets properties to the
> > consumers, until the actual cell values are defined.
>
> Sounds like you should implement providers first. Or just live with the
> warning as a reminder to implement the reset provider?

I'd go for the latter. The upstream r9a06g032.dtsi is still under active
development. Until very recently, the only device supported was the
serial console.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds