linux-kernel - Re: [PATCH 0/5] Add Maxim 77802 PMIC support

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Message-ID: <CAD=FV=WknbbqSojDD4pe-Xpd6J4LxkjU-O9JwQjU+gnh+6N=4A@mail.gmail.com>
Date:	Mon, 9 Jun 2014 16:57:07 -0700
From:	Doug Anderson <dianders@...omium.org>
To:	Javier Martinez Canillas <javier.martinez@...labora.co.uk>
Cc:	Krzysztof Kozlowski <k.kozlowski@...sung.com>,
	Lee Jones <lee.jones@...aro.org>,
	Alessandro Zummo <a.zummo@...ertech.it>,
	Kukjin Kim <kgene.kim@...sung.com>,
	Mike Turquette <mturquette@...aro.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
	Sjoerd Simons <sjoerd.simons@...labora.co.uk>,
	Mark Brown <broonie@...nel.org>,
	Olof Johansson <olof@...om.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Daniel Stone <daniels@...labora.com>
Subject: Re: [PATCH 0/5] Add Maxim 77802 PMIC support

Javier,

On Mon, Jun 9, 2014 at 3:55 PM, Javier Martinez Canillas
<javier.martinez@...labora.co.uk> wrote:
>> * The RTC has many subtle differences between the 77686 and 77802.
>> They expanded it to handle a 200 year timeframe instead of 100 and
>> that meant that they had to shuffle the bits around everywhere.  They
>> also moved it to have the same i2c address as the main PMIC so all
>> addresses are different (see max77686_map in the RTC link above).
>>
> There are other differences that were not mentioned:
>
> - The max77802 uses a single register to enable RTC alarm while max77686 uses 1
> bit from a set of registers.

Ironically this is one and the same issue, but you're right that it's
more major than I made it out to be.  See RTCYEARA2.  My theory is
that to account for more possible year values they needed all 8 bits.
That meant that the enable bit needed to move to a different register.
...and once you moved one enable you might as well move them all, I
guess.
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