Richard Fitzgerald b04e68d166 mfd: madera: Don't use regmap_read_poll_timeout to poll for BOOT_DONE
While polling for BOOT_DONE the chip could NAK a read because it is
still booting, which would terminate the regmap_read_poll_timeout()
with an error.

Instead implement a polling loop that ignores read errors so we
always poll until the chip signals boot or the loop times out.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
2018-10-23 08:58:34 +01:00
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