mfd: cpcap: Implement IRQ sense helper
CPCAP can sense if IRQ is currently set or not. This functionality is required for a few subdevices, such as the power button and usb phy modules. Signed-off-by:Sebastian Reichel <sre@kernel.org> Acked-by:
Tony Lindgren <tony@atomide.com> Signed-off-by:
Lee Jones <lee.jones@linaro.org>
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