linux-kernel - Re: [PATCH 2/9] ARM: dts: exynos: move exynos-bus nodes out of soc in Exynos5420

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Date:   Sat, 28 Jan 2023 11:43:21 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Marek Szyprowski <m.szyprowski@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Kukjin Kim <kgene@...nel.org>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     replicant@...osl.org, phone-devel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Martin Jücker <martin.juecker@...il.com>,
        Henrik Grimler <henrik@...mler.se>,
        Chanwoo Choi <cw00.choi@...sung.com>
Subject: Re: [PATCH 2/9] ARM: dts: exynos: move exynos-bus nodes out of soc in
 Exynos5420

On 26/01/2023 11:59, Krzysztof Kozlowski wrote:
> On 26/01/2023 10:47, Marek Szyprowski wrote:
>> Hi Krzysztof,
>>
>> On 25.01.2023 10:45, Krzysztof Kozlowski wrote:
>>> The soc node is supposed to have only device nodes with MMIO addresses,
>>> as reported by dtc W=1:
>>>
>>>    arch/arm/boot/dts/exynos5420.dtsi:1070.24-1075.5:
>>>      Warning (simple_bus_reg): /soc/bus-wcore: missing or empty reg/ranges property
>>>
>>> and dtbs_check:
>>>
>>>    exynos5420-arndale-octa.dtb: soc: bus-wcore:
>>>      {'compatible': ['samsung,exynos-bus'], 'clocks': [[2, 769]], 'clock-names': ['bus'], 'status': ['disabled']} should not be valid under {'type': 'object'}
>>>
>>> Move the bus nodes and their OPP tables out of SoC to fix this.
>>> Re-order them alphabetically while moving and put some of the OPP tables
>>> in device nodes (if they are not shared).
>>>
>>> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>>
>> Frankly speaking I'm not very keen on moving those bus nodes out of 
>> /soc. Technically speaking this is definitely a part of soc and doesn't 
>> make much sense outside of it. IMHO they describe SoC hardware details 
>> and they might be moved somehow under clock controller device(s), 
>> although this would require some changes in the bindings and drivers.
> 
> That's the only way to fix it without change of drivers any ABI
> compatibility issue. The same we do for Qualcomm interconnects, e.g.
> arch/arm64/boot/dts/qcom/sm8450.dtsi where some interconnects have some
> do not have MMIO space.
> 
> I want to achieve finally clean dtbs_check run for all Exynos sources.
> The in-tree bindings already pass, so now I am fixing the ones coming
> from dtschema (simple-bus.yaml in particular).
> 
> If you have any other idea how to seamlessly clean it up, I am happy to
> hear. But I guess the main problem is that no one is being paid for
> doing anything for Samsung Exynos, so for free not many put much effort
> into working on it.

Marek, I value your feedback a lot and I appreciate your help here. Just
to be clear that I am not ignoring it, little disclaimer:

Unless there is a clear NAK from you or someone else, with an idea to
fix or with a commitment to change driver/bindings, I am planning to
grab these changes.

I really want to get the dtbs_check done. With these and my other fixes,
the arm64 exynos DTS pass fully all dtschema and in-kernel dtbs_check.

Best regards,
Krzysztof