Re: [PATCH v3 1/6] ARM: tegra: add gpiod_lookup table for paz00

[Thierry Reding]

On Thu, Nov 28, 2013 at 01:54:10PM +0100, Marc Dietrich wrote:
[...]
> Yes, rfkill is just an interface for userspace to able to control the gpio. 
> E.g. backlight of medcom-wide seems to be related to the pwm controller, but 
> is not a subnode of it. Instead it is a device of its own without parent. 
> Hence, we may include rfkill in a similar, "free-standing" node. But this 
> approch was rejected in the past. Maybe this changed now.

Indeed. I think we really do need ways to represent this kind of device.
If we can't then how are we supposed to get rid of board files?

> Thinking a bit more about it, rfkill is neither a hw block nor a function of 
> the wifi driver, so I guess it cannot be added to the usb controller (or a usb 
> device).

I guess it depends a bit. Some rfkill-type devices may control more than
just WiFi (bluetooth, NFC, ...). If it really only controls WiFi, I
think it would still be reasonable to represent it as a child of the
WiFi device. It is, after all, a mechanism to control the WiFi hardware.

Alternatively I suppose we wouldn't really need to have an explicit
node. The WiFi driver could simply instantiate an rfkill device based on
its own properties.

Thierry

Attachment: pgp00000.pgp
Description: PGP signature