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    Subject[PATCH v3 1/3] serial: 8250: introduce get_divisor() and set_divisor() hook
    Add these two hooks so that they can be overridden with driver specific
    implementations.

    Signed-off-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
    Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
    ---
    drivers/tty/serial/8250/8250_core.c | 4 ++++
    drivers/tty/serial/8250/8250_port.c | 27 +++++++++++++++++++++++----
    include/linux/serial_core.h | 7 +++++++
    3 files changed, 34 insertions(+), 4 deletions(-)

    diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c
    index 9342fc2ee7df..a0bb77290747 100644
    --- a/drivers/tty/serial/8250/8250_core.c
    +++ b/drivers/tty/serial/8250/8250_core.c
    @@ -1023,6 +1023,10 @@ int serial8250_register_8250_port(struct uart_8250_port *up)
    uart->port.get_mctrl = up->port.get_mctrl;
    if (up->port.set_mctrl)
    uart->port.set_mctrl = up->port.set_mctrl;
    + if (up->port.get_divisor)
    + uart->port.get_divisor = up->port.get_divisor;
    + if (up->port.set_divisor)
    + uart->port.set_divisor = up->port.set_divisor;
    if (up->port.startup)
    uart->port.startup = up->port.startup;
    if (up->port.shutdown)
    diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
    index 709fe6b4265c..ce0dc17f18ee 100644
    --- a/drivers/tty/serial/8250/8250_port.c
    +++ b/drivers/tty/serial/8250/8250_port.c
    @@ -2498,9 +2498,9 @@ static unsigned int npcm_get_divisor(struct uart_8250_port *up,
    return DIV_ROUND_CLOSEST(port->uartclk, 16 * baud + 2) - 2;
    }

    -static unsigned int serial8250_get_divisor(struct uart_port *port,
    - unsigned int baud,
    - unsigned int *frac)
    +static unsigned int serial8250_do_get_divisor(struct uart_port *port,
    + unsigned int baud,
    + unsigned int *frac)
    {
    struct uart_8250_port *up = up_to_u8250p(port);
    unsigned int quot;
    @@ -2532,6 +2532,16 @@ static unsigned int serial8250_get_divisor(struct uart_port *port,
    return quot;
    }

    +static unsigned int serial8250_get_divisor(struct uart_port *port,
    + unsigned int baud,
    + unsigned int *frac)
    +{
    + if (port->get_divisor)
    + return port->get_divisor(port, baud, frac);
    +
    + return serial8250_do_get_divisor(port, baud, frac);
    +}
    +
    static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
    tcflag_t c_cflag)
    {
    @@ -2570,7 +2580,7 @@ static unsigned char serial8250_compute_lcr(struct uart_8250_port *up,
    return cval;
    }

    -static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
    +static void serial8250_do_set_divisor(struct uart_port *port, unsigned int baud,
    unsigned int quot, unsigned int quot_frac)
    {
    struct uart_8250_port *up = up_to_u8250p(port);
    @@ -2603,6 +2613,15 @@ static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
    }
    }

    +static void serial8250_set_divisor(struct uart_port *port, unsigned int baud,
    + unsigned int quot, unsigned int quot_frac)
    +{
    + if (port->set_divisor)
    + port->set_divisor(port, baud, quot, quot_frac);
    + else
    + serial8250_do_set_divisor(port, baud, quot, quot_frac);
    +}
    +
    static unsigned int serial8250_get_baud_rate(struct uart_port *port,
    struct ktermios *termios,
    struct ktermios *old)
    diff --git a/include/linux/serial_core.h b/include/linux/serial_core.h
    index 06ea4eeb09ab..406edae44ca3 100644
    --- a/include/linux/serial_core.h
    +++ b/include/linux/serial_core.h
    @@ -127,6 +127,13 @@ struct uart_port {
    struct ktermios *);
    unsigned int (*get_mctrl)(struct uart_port *);
    void (*set_mctrl)(struct uart_port *, unsigned int);
    + unsigned int (*get_divisor)(struct uart_port *,
    + unsigned int baud,
    + unsigned int *frac);
    + void (*set_divisor)(struct uart_port *,
    + unsigned int baud,
    + unsigned int quot,
    + unsigned int quot_frac);
    int (*startup)(struct uart_port *port);
    void (*shutdown)(struct uart_port *port);
    void (*throttle)(struct uart_port *port);
    --
    2.18.0
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