Pali Rohár 1138bbe05e serial: Use -EAGAIN in getc and putc
U-Boot serial code already handles -EAGAIN value from getc and putc
callbacks. So change drivers code to return -EAGAIN when HW is busy instead
of doing its own busy loop and waiting until HW is ready.

Signed-off-by: Pali Rohár <pali@kernel.org>
2023-01-02 16:01:40 -05:00
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