[PATCH 0/7] share sa1100 rtc driver to arch-mmp

[Haojian Zhuang]

On Thu, Feb 23, 2012 at 6:00 PM, Russell King - ARM Linux
<linux at arm.linux.org.uk> wrote:
> On Thu, Feb 23, 2012 at 05:45:20PM +0800, Haojian Zhuang wrote:
>> On Thu, Feb 23, 2012 at 4:52 PM, Robert Jarzmik <robert.jarzmik at free.fr> wrote:
>> > The behaviour should be as before, the config should be able to choose between
>> > rtc-pxa and rtc-sa1100 for a pxa27x based board. For sharpsl_pm, I suppose the
>> > rtc-sa1100 will be chosen in the .config, and for mioa701, it will be
>> > rtc-pxa.
>> >
>> > Just to clear, I'm against removing "resources, clock" from pxa27x platform code
>> > which would break rtc-pxa driver on pxa27x. Now I don't care if you're talking
>> > about changing some "defconfigs".
>> >
>>
>> How about to move the rtc-sa1100 or rtc-pxa device register from
>> pxa27x.c to board file? Then we'll be both happy.
>
> How about stopping thinking about "one or other" and start thinking "both" ?
> The RTC library can and does cope with more than one RTC, and each RTC is
> exposed uniquely to userspace.  So there shouldn't be any problem in keeping
> both around, or even registering both together.
>
> You just have to make sure you don't use both of them together as their
> open functions will want to claim the same IRQ.  That's not really a
> problem because that should provide exclusivity between the two.

Resource is bind with platform device. We'll meet resource conflict if
we register them both.

Thanks
Haojian