linux-kernel - Re: [PATCH 1/2] dt-bindings: serial: snps-dw-apb-uart: make interrupt optional

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Date:   Wed, 2 Aug 2023 23:53:59 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Jisheng Zhang <jszhang@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Jiri Slaby <jirislaby@...nel.org>,
        linux-serial@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: serial: snps-dw-apb-uart: make
 interrupt optional

On Thu, Aug 03, 2023 at 12:57:44AM +0300, Andy Shevchenko wrote:
> On Wed, Aug 02, 2023 at 04:43:48PM +0100, Conor Dooley wrote:
> > On Wed, Aug 02, 2023 at 11:05:44PM +0800, Jisheng Zhang wrote:
> > > The driver fall back to poll style when there's no irq. "poll" still
> > > looks better than no support.
> > 
> > What is the user for this where the interrupt is not actually wired up
> > in the hardware?
> 
> FYI: kernel console doesn't use interrupts, so for example it might be
> the debug port. Note, I have no idea of the Zhang's case, just my assumption.

I'm less interested in what the software is doing, it's what the device 
that has not connected the interrupt is that I am curious about.

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