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STMFX supply is disabled during suspend. To avoid a too early access to
the STMFX firmware on resume, reset the chip and wait for its firmware to
be loaded.

Fixes: 06252ade

 ("mfd: Add ST Multi-Function eXpander (STMFX) core driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>