[PATCH v3 26/29] serial: dm: Add support for puts

[Tom Rini]

On Tue, Mar 22, 2022 at 04:59:34PM -0400, Sean Anderson wrote:

> Some serial drivers can be vastly more efficient when printing multiple
> characters at once. Non-DM serial has had a puts option for these sorts
> of drivers; implement it for DM serial as well.
> 
> Because we have to add carriage returns, we can't just pass the whole
> string directly to the serial driver. Instead, we print up to the
> newline, then print a carriage return, and then continue on. This is
> less efficient, but it is better than printing each character
> individually. It also avoids having to allocate memory just to add a few
> characters.
> 
> Drivers may perform short writes (such as filling a FIFO) and return the
> number of characters written in len. We loop over them in the same way
> that _serial_putc loops over putc.
> 
> This results in around sizeof(void *) growth for all boards with
> DM_SERIAL. The full implementation takes around 140 bytes.
> 
> Signed-off-by: Sean Anderson <sean.anderson at seco.com>
> Reviewed-by: Simon Glass <sjg at chromium.org>

Applied to u-boot/next, thanks!

-- 
Tom
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