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Complete the description of the serial console by adding RTS/CTS, the external clock crystal, and pin control. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/8e5701ca2a5f5925918217ab79e8489535339e7b.1645458249.git.geert+renesas@glider.be