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Simplify the IRQ handler by using regmap_update_bits_check.
Reviewed-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
Link: https://lore.kernel.org/r/20240115232215.273374-2-alexandre.belloni@bootlin.com

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>