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

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Message-ID: <20140422082139.GF17657@lee--X1>
Date:	Tue, 22 Apr 2014 09:21:39 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Matt Porter <mporter@...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

> > > > 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.

Let's stick method fabricated by the I2C subsystem. It may seem strange
from a h/w perspective, but it is the way we (you) have coded it, as
the first parameter of i2c_new_dummy() is the 'managing' (primary,
parent, master, whatever) device, so '_sec' would suit as an
identifying appendage for the resultant device.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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