Hello!

On Sun, Aug 19, 2012 at 8:34 PM, Tomas Hlavacek [off-list ref] wrote:

Added file /sys/devices/.../tty/ttySX/uartclk to allow reading
uartclk value in struct uart_port in serial_core via sysfs.

It simplifies initialization verification of no-name cards that
have non-standard oscillator speed while having no distinguishing
PCI IDs to allow autodetection.

tty_register_device() has been generalized and refactored in order
to add support for setting drvdata and attribute_group to the device.

I have updated the patch to a new v4 in order to remove the race in
sysfs file creation and add sysfs file description to a Documentation
directory. But still the patch creates the sysfs file separately for
each serial TTY device by assigning attribute_groups to the struct
device and not for the whole driver at once as Greg advised because I
was unable to figure out how to do that (even though I tried pretty
hard). Does it make sense like this? Or do you have any hint for a
better way to do it, please?

Thanks,
Tomas