RE: [PATCH v2 3/3] i2c: smbus: Use device_*() functions instead of of_*()

[Akhil R]

> On Wed, Jan 12, 2022 at 4:15 PM Akhil R <akhilrajeev@xxxxxxxxxx> wrote:
> >
> > Change of_*() functions to device_*() for firmware agnostic usage.
> > This allows to have smbus_alert interrupt without any changes
> 
> the smbus_alert
> 
> > in the controller drivers using ACPI table.
> 
> the ACPI
> 
> ...
> 
> This change reveals potential issue:
> 
> > -               irq = of_irq_get_byname(adapter->dev.of_node, "smbus_alert");
> > +               irq = device_irq_get_byname(adapter->dev.parent, "smbus_alert");
> 
> >                 if (irq <= 0)
> 
> I guess this '= 0' part should be fixed first.

'0' is a failure as per the documentation of of_irq_get_byname() as well as
of_irq_get(). The case is different for acpi_irq_get(), but it is handled in
fwnode_irq_get(). If I understood it right, a return value of '0' should be 
considered a failure here.

Thanks,
Akhil