spi / PM: Support dev_pm_ops
Allow SPI drivers to use runtime PM and other dev_pm_ops features by implementing dev_pm_ops for the bus. The existing bus specific suspend and resume functions will be called if a driver does not provide dev_pm_ops allowing for transition to the new model. Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: NGrant Likely <grant.likely@secretlab.ca> Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
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