linux-kernel - Re: [v2] rtc: pcf85363/pcf85263: fix error that failed to run hwclock -w

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Message-ID: <20190821112142.GD5128@sirena.co.uk>
Date:   Wed, 21 Aug 2019 12:21:42 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Li Yang <leoyang.li@....com>
Cc:     Alexandre Belloni <alexandre.belloni@...tlin.com>,
        nandor.han@...sala.com, Biwen Li <biwen.li@....com>,
        a.zummo@...ertech.it, linux-rtc@...r.kernel.org,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [v2] rtc: pcf85363/pcf85263: fix error that failed to run
 hwclock -w

On Tue, Aug 20, 2019 at 01:33:14PM -0500, Li Yang wrote:

> Some of the RTC hardware has the capability of address wrapping which
> means if you access a continuous address range across a certain
> boundary(could be the boundary of a regmap region) the hardware
> actually wrap the access to a lower address.  But the address
> violation check of regmap rejects such access.  According to
> Alexcandre, the address wrapping is essential to the functionality of

It's *essential*?  Will innovation never cease?

> some RTC devices and can improve performance for some others.  We are
> wondering if it is reasonable to have regmap support this address
> wrapping.

I guess, I don't see any particular reason why not unless the patches
are horrible or get in the way of other stuff.

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