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From:   Fabio Estevam <festevam@gmail.com>
Date:   Sat, 26 Oct 2019 17:31:03 -0300
Message-ID: <CAOMZO5Bb=1CUpw__xxS2N0w+ZP0+LnBBW9+JLVr03x6TC2Z7=g@mail.gmail.com>
Subject: Re: [PATCH, RESEND] serial: 8250-mtk: Ask for IRQ-count before
 request one
To:     Frank Wunderlich <frank-w@public-files.de>
Cc:     linux-mediatek@lists.infradead.org,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel <linux-kernel@vger.kernel.org>,
        linux-serial@vger.kernel.org,
        Matthias Brugger <matthias.bgg@gmail.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>
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On Sat, Oct 26, 2019 at 4:46 PM Frank Wunderlich
<frank-w@public-files.de> wrote:
>
> at least on bananapi-r2 we have only 1 IRQ and need to
> check for IRQ-count to fix following Errors during probe:
>
> [    4.935780] mt6577-uart 11004000.serial: IRQ index 1 not found
> [    4.962589] 11002000.serial: ttyS1 at MMIO 0x11002000 (irq = 202, base_baud = 1625000) is a ST16650V2
> [    4.972127] mt6577-uart 11002000.serial: IRQ index 1 not found
> [    4.998927] 11003000.serial: ttyS2 at MMIO 0x11003000 (irq = 203, base_baud = 1625000) is a ST16650V2
> [    5.008474] mt6577-uart 11003000.serial: IRQ index 1 not found
>
> based on Patch from Anson Huang
> https://patchwork.ozlabs.org/patch/1164500/

The solution that was accepted for this case was to use
platform_get_irq_optional() instead.

You could try using platform_get_irq_optional() here as well.