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

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Date:   Mon, 2 May 2022 11:19:19 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     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>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Magnus Damm <magnus.damm@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        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 Krzysztof,

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.

> > Signed-off-by: Herve Codina <herve.codina@...tlin.com>
> > Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>

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