linux-kernel - Re: Using regmap_update_bits to update a write only register

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Date:	Fri, 6 Mar 2015 11:21:42 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Daniel Baluta <daniel.baluta@...il.com>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Using regmap_update_bits to update a write only register

On Thu, Mar 05, 2015 at 08:14:14PM +0200, Daniel Baluta wrote:
> On Mar 5, 2015 7:54 PM, "Mark Brown" <broonie@...nel.org> wrote:

> > Probably, or there's a bug.  What should happen is that if the register
> > default appeared successfully then the read will get statisfied from the
> > cache in the manner you describe - presumably that's gone wrong somehow.
> > Have you set num_reg_defaults?  That's the obvious thing...

> Did that. I will have a closer look. Thanks for the answer.

OK, the other thing that springs to mind to check is that the register
didn't somehow get marked as volatile.

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