linux-kernel - Re: [alsa-devel] [PATCH 6/8] extcon: arizona: Add support for WM8998 and WM1814

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Message-ID: <20150423141540.GA17323@opensource.wolfsonmicro.com>
Date:	Thu, 23 Apr 2015 15:15:40 +0100
From:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
To:	Chanwoo Choi <cw00.choi@...sung.com>
Cc:	gnurou@...il.com, alsa-devel@...a-project.org,
	devicetree@...r.kernel.org, linus.walleij@...aro.org,
	patches@...nsource.wolfsonmicro.com, linux-kernel@...r.kernel.org,
	linux-gpio@...r.kernel.org, broonie@...nel.org,
	myungjoo.ham@...sung.com, ckeepax@...nsource.wolfsonmicro.com,
	lee.jones@...aro.org
Subject: Re: [alsa-devel] [PATCH 6/8] extcon: arizona: Add support for
	WM8998 and WM1814

On Wed, Apr 22, 2015 at 07:20:09PM +0900, Chanwoo Choi wrote:
> On 04/22/2015 06:19 PM, Richard Fitzgerald wrote:
> > On Wed, Apr 22, 2015 at 02:53:42PM +0900, Chanwoo Choi wrote:
> >> Hi Richard,
> >>
> >>> @@ -1176,6 +1182,11 @@ static int arizona_extcon_probe(struct platform_device *pdev)
> >>>  			break;
> >>>  		}
> >>>  		break;
> >>> +	case WM8998:
> >>> +	case WM1814:
> >>> +		info->micd_clamp = true;
> >>> +		info->hpdet_ip = 2;
> >>
> >> What is meaning of '2'? I prefer to use the definition for '2'.
> >>
> > 
> > '2' is the version number of the hpdet ip block in silicon. We're already using
> > it as a raw number '0', '1' or '2' all over extcon-arizona.c so changing it here
> > would mean making other patches to the file that aren't really part of adding
> > WM8998 support, so I'd prefer not to change that as a side-effect of adding WM8998.
> 
> I think that just you can define following definitions and use HPDET_IP_VER_V2 instead of '2'.
> 
> 	#define HPDET_IP_VER_V0		0
> 	#define HPDET_IP_VER_V1		1
> 	#define HPDET_IP_VER_V2		2
> 

Can we deal with that as a separate patch from this series? Like I said,
the code already uses '0' '1' and '2' for the existing codecs so making a
change to use #define means patching the code for the other codecs. That
is not part of adding WM8998 support and I don't like patches that make
unexpected extra side-effect changes that are not relevant to the actual
functionality being added by the patch. It's specially annoying when
cherry-picking or reverting those patches if they included some extra
code change.

If we can get this series submitted I can look at making a later patch
to improve readbility, but since this really is just a version number I
think it would be enough to rename the variable to hpdet_ip_version rather
than effectively doing #define TWO 2

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