linux-kernel - Re: [PATCH v2] dt-bindings: interrupt-controller: loongson,liointc: Fix warnings about liointc-2.0

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Date:   Sat, 2 Sep 2023 14:32:07 +0800
From:   Jianmin Lv <lvjianmin@...ngson.cn>
To:     Binbin Zhou <zhoubb.aaron@...il.com>,
        Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Huacai Chen <chenhuacai@...nel.org>,
        Binbin Zhou <zhoubinbin@...ngson.cn>,
        Huacai Chen <chenhuacai@...ngson.cn>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        loongson-kernel@...ts.loongnix.cn, devicetree@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-mips@...r.kernel.org, diasyzhang@...cent.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] dt-bindings: interrupt-controller: loongson,liointc:
 Fix warnings about liointc-2.0

Each IRQ source of liointc may be routed to different IRQ source of 
cpuintc, for implementing this, bit mapping between liointc and cpuintc 
is required, and the mapping information is used for liointc IRQ routing 
register setting. It seems that interrupt-map can not pass the mapping 
to driver in current driver/of code,  so the mapping is used in a 
non-standard way(of cause, underscore style may be changed in dts and 
driver).

IMO, hardcode routing completely in driver is not flexible and not 
recommended, and if possible, keep current map unchanged please.

Jianmin

Thanks.

On 2023/8/31 上午9:47, Binbin Zhou wrote:
> cc Jianmin Lv.
>
> Hi all:
>
> Jianmin knows Loongson interrupt controllers well, he may have other
> suggestions.
>
> Thanks.
> Binbin
>
> On Wed, Aug 30, 2023 at 11:31 PM Jiaxun Yang <jiaxun.yang@...goat.com> wrote:
>>
>>
>> 在 2023/8/30 22:35, Krzysztof Kozlowski 写道:
>>>> What's the best way, in your opinion, to overhaul this property? As we don't
>>>> really care backward compatibility of DTBs on those systems we can just
>>>> redesign it.
>>> Deprecate the property in the bindings, allow driver to work with or
>>> without it and finally drop it entirely from DTS.
>> I'd love to have such configuration flexibility so I'd be sad to see it go.
>> + Huacai and Binbin, what's your opinion?
>>
>> If dropping such functionality in kernel is a must go, we can hardcode
>> to route all downstream interrupt to the first pin that passed to DT.
>>
>> Thanks
>> - Jiaxun
>>> Best regards,
>>> Krzysztof
>>>