[PATCH v3 4/6] serial: Implement serial_flush() function for console flush() fallback

[Tom Rini]

On Mon, Sep 05, 2022 at 11:31:19AM +0200, Pali Rohár wrote:

> Like in all other console functions, implement also serial_flush() function
> as a fallback int console flush() function.
> 
> Flush support is available only when config option CONSOLE_FLUSH_SUPPORT is
> enabled. So when it is disabled then provides just empty static inline
> function serial_flush().
> 
> Signed-off-by: Pali Rohár <pali at kernel.org>
> Reviewed-by: Simon Glass <sjg at chromium.org>

This breaks building on a number of platforms such as ds109 probably due
to DM_SERIAL not being enabled.

-- 
Tom
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