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

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Message-ID: <B1FC1740-086A-4869-9D97-88B0B742EDE8@gmx.de>
Date:	Mon, 15 Jun 2015 14:42:30 +0200
From:	Sergej Sawazki <ce3a@....de>
To:	Mark Brown <broonie@...nel.org>
CC:	gregkh@...uxfoundation.org, wsa@...-dreams.de,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG ?] regmap: debugfs: WARN_ON at regmap-debugfs.c:151



Am 15. Juni 2015 11:49:22 MESZ, schrieb Mark Brown <broonie@...nel.org>:
>On Sat, Jun 13, 2015 at 03:21:02PM +0200, Sergej Sawazki wrote:
>
>> I did some debugging and found that regmap_readable(), at regmap-
>> debugfs.c:109, returns "false" for all registers, hence the
>> debugfs_off_cache list remains empty and we get an warning in line
>151.
>
>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.

-- 
Sergej
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