sc16is7xx: Allow sharing the IRQ line
When the interrupt line is shared with other devices, the IRQ must be level-triggered, as only one device can trigger a falling edge. To support this, try to acquire the IRQ with IRQF_TRIGGER_LOW|IRQF_SHARED first. Interrupt controllers that lack support for level-triggers will return an error, in which case the driver will now retry the acqusition with IRQF_TRIGGER_FALLING, which was also the default before. Signed-off-by: Daniel Mack <daniel@zonque.org> Link: https://lore.kernel.org/r/20200521091152.404404-6-daniel@zonque.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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