linux-kernel - Re: [PATCH v3 3/9] dt-bindings: PCI: renesas,pci-rcar-gen2: 'depends-on' is no more optional

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Date:   Fri, 9 Dec 2022 09:06:55 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Herve Codina <herve.codina@...tlin.com>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Magnus Damm <magnus.damm@...il.com>,
        Gareth Williams <gareth.williams.jx@...esas.com>,
        linux-renesas-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>
Subject: Re: [PATCH v3 3/9] dt-bindings: PCI: renesas,pci-rcar-gen2:
 'depends-on' is no more optional

On 08/12/2022 16:51, Herve Codina wrote:
> Hi Krzysztof,
> 
> On Thu, 8 Dec 2022 10:46:32 +0100
> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
> 
>> On 08/12/2022 10:05, Herve Codina wrote:
>>> Hi Krzysztof,
>>>
>>> On Thu, 8 Dec 2022 09:26:41 +0100
>>> Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:
>>>   
>>>> On 07/12/2022 17:24, Herve Codina wrote:  
>>>>> The 'depends-on' property is set in involved DTS.
>>>>>
>>>>> Move it to a required property.
>>>>>
>>>>> Signed-off-by: Herve Codina <herve.codina@...tlin.com>
>>>>> ---
>>>>>  Documentation/devicetree/bindings/pci/renesas,pci-rcar-gen2.yaml | 1 +    
>>>>
>>>> This should be squashed with previous patch. There is no point to add
>>>> property and immediately in the next patch make it required. Remember
>>>> that bindings are separate from DTS.
>>>>
>>>> Best regards,
>>>> Krzysztof
>>>>  
>>>
>>> I though about make dtbs_check in case of git bisect.  
>>
>> And what would this commit change? In Git you will have
>> 1. dt-bindings: PCI: renesas,pci-rcar-gen2: Add depends-on for RZ/N1 SoC
>> family
>> 2. dt-bindings: PCI: renesas,pci-rcar-gen2: 'depends-on' is no more optional
>>
>> so what is the difference for git bisect?
> 
> Well, today, I have:
> 1. dt-bindings: Add depends-on
> 2. dts: Add depends-on
> 3. dt-bindings: Move depends-on to mandatory

What does it mean "I have"? Patches on mailing list? But we talk about
Git and I wrote you bindings are DTS are not going the same tree.

> 
> If I squash dt-bindings commits, I am going to have:
>   1. dt-bindings: Add mandatory depends-on
>   2. dts: Add depends-on
> or
>   1. dts: Add depends-on
>   2. dt-bindings: Add mandatory depends-on

And how does it matter? Anyway it goes separate trees.

> 
> I have not tested but if I used only the first commit in each
> case (git bisect):

It's not bisectable anyway, you cannot make it bisectable within one
release.

> In the first case, dtbs_check is probably going to signal the
> missing 'depends-on' property on dts.
> In the second case, dtbs_check is probably going to signal the
> not described 'depends-on' property present in dts.

And why is that even a problem?

Best regards,
Krzysztof