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Date: Wed, 24 Jun 2015 22:49:59 +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 On Mon, 15 Jun 2015 15:49:33 +0100, Mark Brown wrote: > 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. > You are right, the registers are not physically readable. Sorry for the confusion. What I actually was trying to do is to read the cached register values. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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