(subset) [PATCH v3 0/3] spi: xilinx: switch to device properties and make IRQs optional

[Mark Brown]

On Wed, Jan 21, 2026 at 01:26:04PM +0100, Michal Simek wrote:
> On 1/21/26 12:39, Mark Brown wrote:

> > My understanding was that the hardware doesn't require physically wiring
> > up the interrupt signal and can work in a polling only mode.  That's not
> > unknown for SPI controllers.  If the interrupt is actually a strong
> > requirement for the hardware (and especially if it is actually wired up
> > on this system) then we should drop these patches.

> Keep in mind one thing. This is soft IP in fpga. If you connect in design
> IRQ you will have it. If you don't connect it, you don't have it.
> From HW perspective both of them are valid options.

Yes, that's what I thought was happening - this means that it's valid to
not describe an interrupt for the device.  It's not like a primary clock
where the device simply won't function without it being wired up.

> Then the question is if DT binding in Linux are targeting HW capability and
> configurations or describing Linux driver. I was said multiple times that it
> should describe HW not actually what Linux driver implements.

Right, so if the hardware has an optional interrupt then the binding
should too.
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