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

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Message-ID: <20200409142620.GE5399@sirena.org.uk>
Date:   Thu, 9 Apr 2020 15:26:20 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Baolin Wang <baolin.wang7@...il.com>
Cc:     Lee Jones <lee.jones@...aro.org>, Arnd Bergmann <arnd@...db.de>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 2/3] regmap: Add reg_update_bits() support

On Thu, Apr 09, 2020 at 10:12:44PM +0800, Baolin Wang wrote:
> On Thu, Apr 9, 2020 at 6:45 PM Mark Brown <broonie@...nel.org> wrote:

> > 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.

> I understood your concern. But the syscon driver need use the MMIO
> devices' resources (such as address mapping, clock management and so
> on), if move this to further up stack, I am afraid the update_bits()
> can not use the resources in 'struct regmap_mmio_context'. Do you have
> any good suggestion? Thanks.

If the syscon driver needs to be peering into the regmap implementation
that seems like there's a serious abstraction problem - users of the
regmap shouldn't be looking at the implmentation at all.  Why do you
think this is needed?

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