regmap: add regmap_read_poll_timeout() helper
Add the regmap_read_poll_timeout() macro based on the Linux implementation to simplify register polling with configurable timeout and sleep. Tested-by: Jerome Brunet <jbrunet@baylibre.com> Acked-by: Jagan Teki <jagan@openedev.com> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
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