Quoting Mauro Carvalho Chehab (2021-01-29 11:51:57)

The Hisilicon 6421v600 SPMI driver is ready for mainstream.

So, move it from staging.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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Acked-by: Stephen Boyd <sboyd@kernel.org>

Rob had some comments on the binding that don't look to be addressed
though so I'd prefer we get the binding into shape before graduating
this driver from staging.