rtc: rp5c01: add NVRAM support
The Ricoh RP5C01 RTC contains 26 x 4 bits of NVRAM. Provide access to it via a sysfs "nvram" attribute file. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Wan ZongShun <mcuos.com@gmail.com> Cc: Alessandro Zummo <a.zummo@towertech.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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