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gpio: mmio: handle "ngpios" properly in bgpio_init()
bgpio_init() uses "sz" argument to populate ngpio, which is not accurate. Instead, read the "ngpios" property from the DT and if it doesn't exist, use the "sz" argument. With this change, drivers no longer need to overwrite the ngpio variable after calling bgpio_init. Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
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