mfd: Enable rbtree cache for wm831x devices
Most useful with the regulators where we're doing a lot of read/modify/write updates in potentially performance critical paths. Providing some defaults would make this slightly better but this is a win right now. Signed-off-by: NMark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: NSamuel Ortiz <sameo@linux.intel.com>
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