dt-bindings: serial: renesas,rsci: Document RZ/G3L SoC

dt-bindings: serial: renesas,rsci: Document RZ/G3L SoC

Document the serial communication interface (RSCI) used on the Renesas
RZ/G3L (R9A08G046) SoC. This SoC integrates the same RSCI IP block as
the RZ/G3E (R9A09G047), but it has 3 clocks compared to 6 clocks on
the RZ/G3E SoC. The RZ/G3L has a single TCLK with internal dividers,
whereas the RZ/G3E has explicit clocks for TCLK and its dividers.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20260312082708.98835-2-biju.das.jz@bp.renesas.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>