linux-kernel - Re: [PATCH, RESEND] serial: 8250-mtk: Ask for IRQ-count before request one

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Date:   Sat, 26 Oct 2019 17:31:03 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Frank Wunderlich <frank-w@...lic-files.de>
Cc:     linux-mediatek@...ts.infradead.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-serial@...r.kernel.org,
        Matthias Brugger <matthias.bgg@...il.com>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH, RESEND] serial: 8250-mtk: Ask for IRQ-count before
 request one

On Sat, Oct 26, 2019 at 4:46 PM Frank Wunderlich
<frank-w@...lic-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.