rtc: at91sam9: make use of syscon/regmap to access GPBR registers
The GPBR registers are not part of the RTT block and thus should not be defined in the reg property of the rtt node. Use syscon to provide a proper DT representation and reference the GPBR syscon device in a new "atmel,rtt-rtc-time-reg" property which store both the syscon device phandle and the register offset within the GPBR block. When using non DT boards, we won't be able to retrieve the syscon regmap, hence we need to create our own regmap using the memory region defined in the 2nd memory resource assigned to the RTT platform device. Signed-off-by:Boris BREZILLON <boris.brezillon@free-electrons.com> Acked-by:
Alexandre Belloni <alexandre.belloni@free-electrons.com> Acked-by:
Johan Hovold <johan@kernel.org> Acked-by:
Arnd Bergmann <arnd@arndb.de> Signed-off-by:
Nicolas Ferre <nicolas.ferre@atmel.com>
parent
07d4d724
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