Re: [PATCH] gpio: keep the GPIO line names internal

[Johan Hovold <johan@kernel.org>]

On Mon, Oct 05, 2015 at 11:47:04AM +0200, Markus Pargmann wrote:
> On Sun, Oct 04, 2015 at 03:37:42PM +0200, Johan Hovold wrote:

> > You also need to revert ddd5404007b8 ("gpio-sysfs: Use gpio descriptor
> > name instead of gpiochip names array") however as this is an ABI change.  
> > Otherwise pins with a name in DT will now be exported using the gpio name
> > rather than number as they used to be. [ The current behaviour is
> > maintained by exporting names from chip->names for hard coded names
> > only. ]
> 
> Even for GPIOs from DT it is not a ABI change. The only GPIOs that have
> a GPIO name at the moment are using the GPIO hogging mechanism. But
> hogged GPIOs can't be exported to userspace so there is no difference
> for these.

Yes, but you're aiming at generalising the hogging mechanism so that
such pins can be requested, and that would break the ABI.

Let's keep the legacy chip->names and named-gpio exports separate from
defining line names in DT for now.

Thanks,
Johan