Re: [PATCH 45/50] lasips2: use qdev gpio for output IRQ

[Peter Maydell]

On Mon, 20 Jun 2022 at 14:22, Mark Cave-Ayland
<mark.cave-ayland@ilande.co.uk> wrote:
>
> On 20/06/2022 11:17, Peter Maydell wrote:
> > Well, I think that "unnamed GPIO out" lines should be for
> > actual GPIO lines, ie on a GPIO controller or similar.
> > If you want an outbound IRQ line and don't want to name it,
> > that's what sysbus IRQ lines do. Otherwise, name the GPIO line.
>
> That's interesting - I've always been under the impression that this was the 
> other
> way around, i.e. for a TYPE_DEVICE then unnamed gpios are equivalent to IRQs, 
> and
> that gpio lines for any other non-IRQ purpose should be named :/

Well, named GPIO lines are relatively new, so if you look at older
devices you'll probably find plenty that use unnamed GPIO lines
for various things including IRQ lines. But I think that for clarity
if you create something called "gpio_out" the obvious thing is that
that's a GPIO output, and if you create something called "sysbus_irq"
the obvious thing is that that's an IRQ line, and if you want to
do something that's neither of those then the clearest thing is
to name the GPIO.

-- PMM