gpio/omap: Add DT support to GPIO driver
Adapt the GPIO driver to retrieve information from a DT file. Allocate the irq_base dynamically and rename bank->virtual_irq_start to bank->irq_base. Change irq_base type to int instead of u16 to match irq_alloc_descs output. Add documentation for GPIO properties specific to OMAP. Signed-off-by: Benoit Cousson <b-cousson@ti.com> Cc: Tarun Kanti DebBarma <tarun.kanti@ti.com> Acked-by: Rob Herring <rob.herring@calxeda.com>
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