[PATCH v2] serial: Use -EAGAIN in getc and putc

[Tom Rini]

On Sun, Dec 11, 2022 at 12:31:21AM +0100, Pali Rohár wrote:

> 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 at kernel.org>

Applied to u-boot/next, thanks!

-- 
Tom
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