drivers/rtc/rtc-snvs: add clock support
Add clock enable and disable support for the SNVS peripheral, which is required for using the RTC within the SNVS block. The clock is not strictly enforced, as this would break the i.MX devices. The clocking for the i.MX devices seems to be enabled elsewhere and enabling RTC SNVS for Vybrid results in a crash. This patch adds the clock support but also makes it optional so Vybrid platform can use the clock if defined while making sure not to break i.MX. Signed-off-by: NSanchayan Maity <maitysanchayan@gmail.com> Cc: Shawn Guo <shawn.guo@linaro.org> Acked-by: NStefan Agner <stefan@agner.ch> Acked-by: NAlessandro Zummo <a.zummo@towertech.it> Signed-off-by: NAndrew Morton <akpm@linux-foundation.org> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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