linux-kernel - Re: [RFC PATCH 2/3] regmap: Add reg_update

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Date:   Thu, 9 Apr 2020 11:45:46 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     lee.jones@...aro.org, arnd@...db.de, orsonzhai@...il.com,
        zhang.lyra@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/3] regmap: Add reg_update_bits() support

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@...il.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.

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