Re: [PATCH 0/2] serial: 8250_dw: add fractional divisor support
From: Andy Shevchenko
Date: Mon Jul 02 2018 - 06:18:52 EST
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 <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy