Search Linux Wireless

Re: [PATCH v3 3/5] nfc: pn533: add UART phy driver

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Mon, Oct 29, 2018 at 04:51:10PM +0100, Lars Poeschel wrote:
> On Mon, Oct 29, 2018 at 12:07:04PM +0100, Johan Hovold wrote:

> > > Wouldn't that be the scope of another later patch then ?
> > 
> > Possibly. We have accepted some serdev drivers already taking the lazy
> > approach of opening the port in probe. Depending on the driver, it may
> > not be too bad (e.g. for some specific hardware which you know you'll
> > always use), but it not really nice to have everyone pay a price in
> > terms of power-consumption for a feature that is rarely used.
> 
> Is there a way in serdev to close a port, but still occupy it ?
> I'd like to do the basic chip initialisation in _probe and then close
> the port for power-consuption reasons. I'd like to have the port still
> occupied, so that it's not available to other possible users in the
> meantime. I'd then do a serdev open again in dev_up and really use it
> from there.
> dev_down is then for serdev close and also still occupy it.
> closing and releasing would then be done in _remove.

The serdev device is bound you driver regardless of whether you open the
port or not, so just use serdev_device_open() and serdev_device_close()
as necessary at probe() if you need to do some setup and then later at
dev_up() and dev_down(), respectively.

Johan



[Index of Archives]     [Linux Host AP]     [ATH6KL]     [Linux Wireless Personal Area Network]     [Linux Bluetooth]     [Wireless Regulations]     [Linux Netdev]     [Kernel Newbies]     [Linux Kernel]     [IDE]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite Hiking]     [MIPS Linux]     [ARM Linux]     [Linux RAID]

  Powered by Linux