[PATCH v2 12/19] ARM: at91/rtc-at91sam9: each SoC can select the RTT device to use

[Jean-Christophe PLAGNIOL-VILLARD]

On 17:25 Wed 22 Feb     , Arnd Bergmann wrote:
> On Wednesday 22 February 2012, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > But if you change the rtc driver to always bind to the existing
> > > "at91_rtt" platform_device and fail the probe() function for the
> > > case that you are on at91sam9263 probing the non-RTC device,
> > > you should get the exact same result without any extra code
> > > in the per-soc files.
> >
> > agreed but as on at91sam9263 you have 2 RTTs so you can have 2 drivers at the
> > same time that use the RTT. So we can not do this except if we set the second
> > RTT to an other device name.
> 
> Let me rephrase what I meant then:
> 
> The first driver should in its probe function do:
> 
> 	if (pdev->id != CONFIG_RTC_DRV_AT91SAM9_RTT)
> 		return -ENODEV;
> 
> while the other driver does
> 
> 	if (pdev->id == CONFIG_RTC_DRV_AT91SAM9_RTT)
> 		return -ENODEV;
> 
> This way, each driver binds to one device but not the other.
> It should even work with an unmodified second driver, as long
> as you guarantee that it's loaded after the first one.
> 
> Any reason why this won't work?
just one other issue I need to pass the GPBR ressource to the RTC driver only

Best Regards,
J.