linux-kernel - Re: [PATCH 3/8] mfd: arizona: Add support for WM8998 and WM1814

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Message-ID: <20150427124019.GA3622@opensource.wolfsonmicro.com>
Date:	Mon, 27 Apr 2015 13:40:19 +0100
From:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:	Mark Brown <broonie@...nel.org>
Cc:	lee.jones@...aro.org, linus.walleij@...aro.org, gnurou@...il.com,
	myungjoo.ham@...sung.com, cw00.choi@...sung.com,
	ckeepax@...nsource.wolfsonmicro.com,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, alsa-devel@...a-project.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH 3/8] mfd: arizona: Add support for WM8998 and WM1814

On Wed, Apr 22, 2015 at 12:08:08PM +0100, Mark Brown wrote:
> On Tue, Apr 21, 2015 at 01:33:51PM +0100, Richard Fitzgerald wrote:
> 
> > +	switch (arizona->type) {
> > +	case WM8998:
> > +	case WM1814:
> > +		/* Some bits are shifted on WM8998,
> > +		 * rearrange to match the standard bit layout
> > +		 */
> > +		val[0] = ((val[0] & 0x60e0) >> 1) |
> > +			 ((val[0] & 0x1e00) >> 2) |
> > +			 (val[0] & 0x000f);
> > +		break;
> 
> Are you sure this approach is going to scale (and avoid confusion)?

It's a total one-off for the WM8998/WM1814, no other codecs have
this shifted-bit-position problem. This shouldn't happen for any
future codecs, so I don't feel like it's worth over-complicating it.
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