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Date: Tue, 11 Sep 2007 16:33:27 +0200 From: Clemens Koller <clemens.koller@...gramm.de> To: Dag-Erling Smørgrav <des@...pro.no> CC: linux-kernel@...r.kernel.org Subject: Re: [RFC+PATCH] RTC calibration Dag-Erling Smørgrav schrieb: > The STMicroelectronics M41T11 is an RTC chip which is similar in most > ways to the Dallas/Maxim DS1307 or DS1337, except that it supports > software calibration: > > http://www.st.com/stonline/books/pdf/docs/6103.pdf > > I want to use this calibration feature [...] > [...] > In order to access this from userland, I've added two ioctls, > (RTC_SPEED_UP and RTC_SPEED_DOWN) with corresponding functions in > drivers/rtc/interface.c (rtc_speed_up() and rtc_speed_down()) and > corresponding slots in rtc_class_ops (speed_up and speed_down). It looks odd to me to do only differential up and down adjustments. I would prefer read_calibration_register and write_calibration_register access and let the userspace decide how much it wants to increment/decrement the register. Or - do you adjust your date also after you changed your battery with +1567days,7h,34m,12sec instead of telling it's 11th Sept. 2007, 4:33pm ? Regards, Clemens Koller __________________________________ R&D Imaging Devices Anagramm GmbH Rupert-Mayer-Straße 45/1 Linhof Werksgelände D-81379 München Tel.089-741518-50 Fax 089-741518-19 http://www.anagramm-technology.com - 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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