rtc: cmos: Use platform_get_irq_optional() in cmos_platform_probe()

The rtc-cmos driver can live without an IRQ and returning an error
code from platform_get_irq() is not a problem for it in general, so
make it call platform_get_irq_optional() in cmos_platform_probe()
instead of platform_get_irq() to avoid a confusing error message
printed by the latter if an IRQ cannot be found for index 0, which
is possible on x86 platforms.

Additionally, on x86, if the IRQ is not defined and the system has
a legacy PIC, hardcode it to RTC_IRQ, which should be safe then (and
which is what the dropped PNP code did).

Fixes: d15f1c2e413e ("ACPI: PNP: Drop CMOS RTC PNP device support")
Reported-by: Nathan Chancellor <nathan@kernel.org>
Closes: https://lore.kernel.org/linux-acpi/20260303060752.GA2749263@ax162/
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Link: https://patch.msgid.link/12857714.O9o76ZdvQC@rafael.j.wysocki
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 0743c6acd6e2c11f5838855f5f485168e1302d51..9cc1c3b53c4b0d2f11e95569e12ae9b08f617e99 100644 (file)
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -1493,9 +1493,18 @@ static int __init cmos_platform_probe(struct platform_device *pdev)
                resource = platform_get_resource(pdev, IORESOURCE_IO, 0);
        else
                resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-       irq = platform_get_irq(pdev, 0);
-       if (irq < 0)
+       irq = platform_get_irq_optional(pdev, 0);
+       if (irq < 0) {
                irq = -1;
+#ifdef CONFIG_X86
+               /*
+                * On some x86 systems, the IRQ is not defined, but it should
+                * always be safe to hardcode it on systems with a legacy PIC.
+                */
+               if (nr_legacy_irqs())
+                       irq = RTC_IRQ;
+#endif
+       }
 
        return cmos_do_probe(&pdev->dev, resource, irq);
 }