linux-kernel - Re: [PATCH 2/4] mfd: bcm590xx: add support for second i2c slave address space

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Date:	Thu, 17 Apr 2014 18:26:16 -0400
From:	Matt Porter <mporter@...aro.org>
To:	Lee Jones <lee.jones@...aro.org>
Cc:	Mark Brown <broonie@...nel.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Liam Girdwood <lgirdwood@...il.com>,
	Tim Kryger <tim.kryger@...aro.org>,
	Markus Mayer <markus.mayer@...aro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/4] mfd: bcm590xx: add support for second i2c slave
 address space

On Thu, Apr 17, 2014 at 07:57:53AM +0100, Lee Jones wrote:
> > > s/regmap/Regmap
> > 
> > It's consistently written regmap in all the documentation and so on :)
> 
> Furry muff; but the comments still stand for the acronyms.
> 
> > > addmap{0,1} doesn't quite sit right with me.
> > 
> > > REVISIT: Ah, it's address-map, rather than add map. Okay, not as bad
> > > as I first thought, but still, is there a better naming convention you
> > > could use?
> > 
> > addrmap or something?
> 
> Right, that was what I was thinking. However, I prefer something along
> the lines of 'i2c' and 'i2c_sec' or 'client' and 'client_slv' etc.

FWIW, the reason it's addmap{0,1} is that the datasheet has documents
ADDMAP=0 and the first bank of registers and ADDMAP=1 as the second bank
of registers. I adopted that to match the docs for the part.

I guess we could do i2c and i2c_sec, I'll just have to put a comment
correlating it to the h/w. Calling it 'slv' implies something else
so we should avoid that here. The notion of a "secondary" i2c device
is completely a Linux I2C subsystem fabrication which wouldn't exist
if it allowed multiple slave addresses per device. From a h/w
perspective there is really no primary and secondary relationship.

I'm fine with i2c/i2c_sec or addrmap0/1 and I will just comment to
correlate with the datasheet..pick one.

-Matt
> 
> -- 
> Lee Jones
> Linaro STMicroelectronics Landing Team Lead
> Linaro.org │ Open source software for ARM SoCs
> Follow Linaro: Facebook | Twitter | Blog
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