serial: 8250_dw: Add StarFive JH7100 quirk

On the StarFive JH7100 RISC-V SoC the UART core clocks can't be set to
exactly 16 * 115200Hz and many other common bitrates. Trying this will
only result in a higher input clock, but low enough that the UART's
internal divisor can't come close enough to the baud rate target.
So rather than try to set the input clock it's better to skip the
clk_set_rate call and rely solely on the UART's internal divisor.

Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20211116150119.2171-15-kernel@esmil.dk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index 53f57c3b9f42ccf2aac5c477ded1a35950162862..1769808031c520bb157de6d182b037e155ba4a94 100644 (file)
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -414,6 +414,8 @@ static void dw8250_quirks(struct uart_port *p, struct dw8250_data *data)
 
                if (of_device_is_compatible(np, "marvell,armada-38x-uart"))
                        p->serial_out = dw8250_serial_out38x;
+               if (of_device_is_compatible(np, "starfive,jh7100-uart"))
+                       p->set_termios = dw8250_do_set_termios;
 
        } else if (acpi_dev_present("APMC0D08", NULL, -1)) {
                p->iotype = UPIO_MEM32;
@@ -696,6 +698,7 @@ static const struct of_device_id dw8250_of_match[] = {
        { .compatible = "cavium,octeon-3860-uart" },
        { .compatible = "marvell,armada-38x-uart" },
        { .compatible = "renesas,rzn1-uart" },
+       { .compatible = "starfive,jh7100-uart" },
        { /* Sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dw8250_of_match);