On Thu, Apr 09, 2020 at 04:57:58PM +0800, Baolin Wang wrote:
> Add reg_update_bits() support in case some platforms use a special method
> to update bits of registers.
> 
> Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
> ---
>  drivers/base/regmap/regmap-mmio.c | 29 ++++++++++++++++++++++++++++-
>  drivers/base/regmap/regmap.c      |  1 +

MMIO devices clearly don't physically have an update_bits() operation so
this should be implemented further up the stack where it applies to all
buses without physical support.