Re: [RESEND v4 4/6] Documentation: misc-devices: Add Documentation for dw-xdata-pcie driver

Hi Gustavo,

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quoted

When I do the following:

  # echo 1 > /sys/kernel/dw-xdata-pcie/write
  # echo 1 > /sys/kernel/dw-xdata-pcie/stop
  # cat /sys/kernel/dw-xdata-pcie/write

Would output from cat above simply show "0 MB/s" then?  I wonder how
someone using this new driver could tell whether "write" or "read"
traffic generation has been enabled aside of reading the sysfs files,
would adding "/sys/kernel/dw-xdata-pcie/active" be an overkill here?

What do you think?

Yes, it would display 0 MB/s. This driver is to be used mainly by the 
Synopsys DesignWare HW prototyping team. I don't think the general public 
will be interested or can use this driver, because requires a special HW 
block available only for this prototype.

Got it.

I tried to reduce to the minimal the interfaces, to avoid possible 
confusion. For instance, even the /sys/kernel/dw-xdata-pcie/stop 
interface could be avoided, because on the driver unloading or changing 
the between write or read it calls the stop procedure.

Oh, OK.
 

Due to the nature of the HW block, it only can allow the write or the 
read at some given moment, therefore based on the last command enable 
write or read, we know which mode is this driving working.
This driver will be used by the testing team on their automation scripts, 
thus they will know exactly the sequence input.

Anyway, thanks for your feedback.

Thank you for taking the time to add more details for me.  Much
appreciated.

Krzysztof