Re: [PATCH 1/3] dmaengine: nbpfaxi: Use platform_get_irq_optional() to get the interrupt

On Fri, Dec 24, 2021 at 3:14 PM Lad Prabhakar
[off-list ref] wrote:

platform_get_resource(pdev, IORESOURCE_IRQ, ..) relies on static
allocation of IRQ resources in DT core code, this causes an issue
when using hierarchical interrupt domains using "interrupts" property
in the node as this bypasses the hierarchical setup and messes up the
irq chaining.

In preparation for removal of static setup of IRQ resource from DT core
code use platform_get_irq_optional().

There are no non-DT users for this driver so interrupt range
(irq_res->start-irq_res->end) is no longer required and with DT we will
be sure it will be a single IRQ resource for each index.

        for (i = 0; irqs < ARRAY_SIZE(irqbuf); i++) {
-               irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
-               if (!irq_res)
+               irq = platform_get_irq_optional(pdev, i);
+               if (irq == -ENXIO)
                        break;
-
-               for (irq = irq_res->start; irq <= irq_res->end;
-                    irq++, irqs++)
-                       irqbuf[irqs] = irq;
+               if (irq < 0)
+                       return irq;
+               irqbuf[irqs++] = irq;
        }

Same comment as per other patch(es), i.e. consider 0 as no IRQ.

-- 
With Best Regards,
Andy Shevchenko

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