pinctrl: single: add low power mode support
For some silicons, the pin configuration register can control the output of the pin when the pad including the pin enter low power mode. For example, the pin can be "Drive 1", "Drive 0", "Float" when the pad including the pin enter low power mode. It is very useful when you want to control the power leakeage when the SOC enter low power mode, and can save more power for the low power mode. Signed-off-by: NChao Xie <chao.xie@marvell.com> Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>
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