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Date:	Thu, 10 Jul 2014 16:13:42 -0700
From:	Greg KH <>
To:	Alex Elder <>
Subject: Re: [PATCH v2] serial: 8250_dw: support high baudrates if possible

On Tue, Jul 01, 2014 at 10:15:34AM -0500, Alex Elder wrote:
> Currently the Synopsys DesignWare 8250 driver assumes its UART clock
> runs at a fixed rate.  If a "real" clock was set up using the common
> clock framework, and that clock's rate is adjustable, it may be
> possible to support a wider range of baud rates by changing the
> UART clock rate.
> This is done by setting up a uart_port->set_termios method that
> requests a clock rate change if a different rate might make it
> more likely to achieve a specified baud.  A new function
> dw8250_adjustable_clk() determines whether such clock rate
> adjustment is an option.
> Signed-off-by: Alex Elder <>
> ---
> v2: Limit clock changing to specific compatible devices.
>  drivers/tty/serial/8250/8250_dw.c | 57 +++++++++++++++++++++++++++++++++++++++
>  1 file changed, 57 insertions(+)

This no longer applies due to other changes in this driver.  Can you
please refresh it against my tty-next branch of the tty.git tree and


greg k-h
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