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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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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