On Fri, Jun 09, 2006 at 01:59:13PM -0400, Stuart MacDonald wrote:
> From: Russell King [[email protected]]
> > I'd rather verify_port didn't get used for that - it's purpose is to
> > validate changes the admin makes to the port.
>
> I did figure out that's what it's currently used as, but I didn't want
> to introduce a whole new call just to verify that the UART has 9bit
> capability.
>
> Why aren't user changes validated?
The only things which users can change is low latency, the alternative
(deprecated) "38400-baud" baud rates, and the custom divisor. None of
these depend on the low level driver, so there's no point asking the
low level driver to validate them.
> 9bit mode is much more than just words of 9 bit length. Parity is
> gone, replaced by the 9th bit; reads and writes have to treat the
> buffers driver-side buffers as 16 bit-wide instead of 8-bit; reads and
> writes to the hardware are correspondingly different; there are new
> interrupts; software flow control is gone; there's special address
> matching and a new ioctl to set that up.
Well, I'll have to read up on this before I can comment any further.
At the moment I don't feel qualified to answer your questions.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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