gpio/langwell: allocate IRQ descriptors dynamically for SPARSE_IRQ
Since x86 is using SPARSE_IRQ by default nowadays it means that we need to allocate IRQ descriptors dynamically using irq_alloc_descs() otherwise the genirq code fails to convert our irq numbers to suitable descriptors. Signed-off-by: NMika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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