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: <5a89e9bf-1004-500a-75e1-995732629937@linaro.org>
Date:   Tue, 3 May 2022 11:29:53 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        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

On 03/05/2022 08:51, Geert Uytterhoeven wrote:
>>>> 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.

For clocks we use in such cases fixed-clock placeholders or empty
phandles. Maybe something like that would work here as well?

Best regards,
Krzysztof