linux-kernel - Re: [BUG ?] regmap: debugfs: WARN

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Message-ID: <20150615144933.GO18309@sirena.org.uk>
Date:	Mon, 15 Jun 2015 15:49:33 +0100
From:	Mark Brown <broonie@...nel.org>
To:	Sergej Sawazki <ce3a@....de>
Cc:	gregkh@...uxfoundation.org, wsa@...-dreams.de,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG ?] regmap: debugfs: WARN_ON at regmap-debugfs.c:151

On Mon, Jun 15, 2015 at 02:42:30PM +0200, Sergej Sawazki wrote:
> Am 15. Juni 2015 11:49:22 MESZ, schrieb Mark Brown <broonie@...nel.org>:

> >We need to change that code to special case write only register maps
> >like this and just skip having a cache for those devices.  They
> >normally
> >have very small register maps anyway so it shouldn't have too big an
> >impact on performance.

> I'm having this issue with a wm8741 DAC, its register map is not
> "write only", it has readable and writeable registers.

Are you *sure* there are physically readable registers on the device?
It's difficult to implement for 7x9 devices given that the top register
bit is in the byte used to send the register address, I expect you'll
find that the registers marked as readable are actually those that
should be cached.

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