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Subject: Re: [PATCH 2/3] i2c: sh_mobile: Use platform_get_irq_optional() to
 get the interrupt
To:     Arnd Bergmann <arnd@arndb.de>
Cc:     Geert Uytterhoeven <geert@linux-m68k.org>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
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From:   Sergei Shtylyov <sergei.shtylyov@gmail.com>
Message-ID: <d74ab454-9337-d168-9b21-842569431b4a@gmail.com>
Date:   Wed, 9 Feb 2022 18:11:35 +0300
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On 2/8/22 3:31 PM, Arnd Bergmann wrote:

[...]
>>> I might have missed something, but it seems the only user of IRQ 0 on
>>> SuperH is smsc911x Ethernet in arch/sh/boards/board-apsh4a3a.c and
>>> arch/sh/boards/board-apsh4ad0a.c, which use evt2irq(0x200).
>>> These should have been seeing the "0 is an invalid IRQ number"
>>> warning splat since it was introduced in commit a85a6c86c25be2d2
>>> ("driver core: platform: Clarify that IRQ 0 is invalid"). Or not:
>>
>>     Warning or no warning, 0 is still returned. :-/
>>     My attempt to put an end to this has stuck waiting a review from the IRQ
>> people...
> 
> I had another look at this after you asked about it on IRC. I don't
> know much SH assembly, but I suspect IRQ 0 has not been delivered
> since 2009 after 1e1030dccb10 ("sh: nmi_debug support."). On a

   Mhm... this commit changes the SH3 code while SH778x are SH4A, no?

[...]

> 
>         Arnd

MBR, Sergey