linux-kernel - Re: [PATCH 1/3] mfd: arizona: Add support for CS47L24

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Date:	Mon, 17 Nov 2014 15:01:07 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Richard Fitzgerald <rf@...nsource.wolfsonmicro.com>
Cc:	Lee Jones <lee.jones@...aro.org>,
	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	linus.walleij@...aro.org, gnurou@...il.com,
	alsa-devel@...a-project.org, tiwai@...e.de,
	patches@...nsource.wolfsonmicro.com, lgirdwood@...il.com,
	linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 1/3] mfd: arizona: Add support for CS47L24

On Mon, Nov 17, 2014 at 12:54:33PM +0000, Richard Fitzgerald wrote:
> On Mon, Nov 17, 2014 at 12:16:48PM +0000, Lee Jones wrote:

> > Looks like I was a little hasty with my comments.  However 8000 lines
> > over 4 platforms just to describe which registers are readable is all
> > a little bit grim.  Is there any way you can use ranges instead of
> > listing every single register on the chip?  How many gaps are there? 

> It's debatable. Ranges would be possible but there are a lot of gaps.
> Personally, speaking as someone who has to maintain these drivers, I
> like that fact that I can look at this file and see exactly which registers
> are readable and volatile because they are all explicitly listed. It's also
> useful that the files are searchable for specific registers.

> I'll point Charles at this to get his opinion.

It's probably also worth pointing out that while ranges do compress the
data a bit they make it harder to answer questions like "is this
register mapped properly" since the question becomes "is the numeric
value of this symbol between the numeric values of any of these other
pairs of symbols we have listed here".  I generally find it harder to
review drivers using ranges since when checking that things are mapped
voatile or whatever you have to do lookups like that.

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