spi/pl022: disable core voltage when idle
This utilizes the new core voltage switch to power off the PL022 core voltage when it's not in use transmitting packets, if and only if a core voltage switch is available. Cc: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org> Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>
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