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

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Message-ID: <ZMuSFYQ4YyIKnI0k@smile.fi.intel.com>
Date:   Thu, 3 Aug 2023 14:40:05 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Conor Dooley <conor@...nel.org>
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 Wed, Aug 02, 2023 at 11:53:59PM +0100, Conor Dooley wrote:
> 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.

As I said. The hw may be purely for debugging purposes (and yes, I have heard
about such a hardware).

-- 
With Best Regards,
Andy Shevchenko