regmap: irq: Allow using zero value for ack_base
In some cases, clear interrupt register may be at address 0. This patch allows to use such configurations by adding additional configuration bit to indicate this. [With doc fix from Levente Kurusa <levex@linux.com> -- broonie] Signed-off-by: NAlexander Shiyan <shc_work@mail.ru> Signed-off-by: NMark Brown <broonie@linaro.org>
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