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

On Wednesday 22 February 2012, Jean-Christophe PLAGNIOL-VILLARD wrote:

On 14:50 Wed 22 Feb     , Arnd Bergmann wrote:

quoted

On Wednesday 22 February 2012, Nicolas Ferre wrote:

quoted

From: Jean-Christophe PLAGNIOL-VILLARD <redacted>

For the RTT as RTC driver rtc-at91sam9, the platform_device structure
is filled during SoC initialization. This will allow to convert this
RTC driver as a standard platform driver.

Can you make this more elaborate? I don't see from this or the code why
you don't just always register the RTT as "rtc-at91sam9". There seems to
be no driver for the "at91_rtt" in tree, so I don't know if there is
an out of tree driver binding to it.

Would it be possible to remove the compile time #if and the resetting
of the device name if both drivers bind to the rtc name and the other
rtt driver binds to both names?

because I see a quite some people use the rtt for something else

so I don't want to change on existing kernel

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.

I guess it also makes sense to specify a device tree property
that lets you detect whether the RTT is used as RTC or something
else.

	Arnd