On Mon, 2018-07-02 at 18:04 +0800, Jisheng Zhang wrote: > For Synopsys DesignWare 8250 uart which version >= 4.00a, there's a > valid divisor latch fraction register. The fractional divisor width is > 4bits ~ 6bits. >
There are several serial IPs that have fractional divider built-in. None is using any specific hooks. Why do you need in your case, esp. taking into consideration that we have a custom ->set_termios() callback? > patch1 introduces necessary hooks to 8250 core. > patch2 implement the fractional divisor support for Synopsys DW 8250. > > Jisheng Zhang (2): > serial: 8250: introduce get_divisor() and set_divisor() hook > serial: 8250_dw: add fractional divisor support > > drivers/tty/serial/8250/8250_core.c | 4 +++ > drivers/tty/serial/8250/8250_dw.c | 54 > +++++++++++++++++++++++++++++ > drivers/tty/serial/8250/8250_port.c | 8 +++++ > include/linux/serial_8250.h | 7 ++++ > 4 files changed, 73 insertions(+) > -- Andy Shevchenko <[email protected]> Intel Finland Oy
