Re: [ts-7000] Re: DS1685/1687 RTC driver for TS7800

[Steve Longerbeam <>]

Hi Alexander,

Looking at this schematic for the TS7800:

http://www.embeddedarm.com/documentation/ts-7800-schematic.pdf

shows the RTC chip as a DS1687. That's all I'm going on, and I wouldn't be surprised if it is an outdated schematic, and that in fact it is actually a M48T86PC as you claim.

How did you find out your board has a M48T86PC? Do you have updated schematics, or did you look over the board with a magnifying glass and read-off the chip part numbers? I'll see if I can read the part #'s on my board.

Steve

----- Original Message ----
From: Alexander Clouter <>
To:
Sent: Monday, September 1, 2008 4:10:33 PM
Subject: [ts-7000] Re: DS1685/1687 RTC driver for TS7800

Steve Longerbeam <steve.longerbeam@ yahoo.com> [20080901 15:09:05 -0700]:
>
> Hi, maybe someone has already done this, but attached is a RTC driver for
> the DS1685/1687 RTC chip. The main driver is platform-independen t code at
> drivers/rtc/ rtc-ds1685. c and /include/linux/ ds1685.h. As usual, it requires
> a platform_device be registered by platform-specific code. The driver
> allows the platform to define its own read/write access to the chip via
> platform_data functions. If those are not implemented, the driver assumes
> the RTC chip is directly accessible via readb/writeb.
>
It would probably be worth mainlining your rtc-ds1685.c independently.

> Attached is patch against 2.6.21-ts.jun102008 . The DS1687 on the TS7800 is
> accessible indirectly via an indexed addressing mode, so the patch includes
> platform_data for accessing the chip.
>
What 'TS7800' do you have, the RTC chip on mine is a M48T86PC1 affair that is
already supported via drivers/rtc/ rtc-m48t86. c?

http://git.eu. kernel.org/ ?p=linux/ kernel/git/ nico/orion. git;a=commitdiff ;h=7171d8672bb0b cb744935bd2c6108 378b5c6c6ad; hp=530c854aa351b 2c7b3b3b6bedae81 43310875206

> I tested this on the TS7800 with hwclock and it works fine, I can set and
> read the clock, although some of the 242 bytes of NVRAM are not accessible
> for some reason which I'm looking into.
>
Looking at the rtc-m48t86.c source I see at the top it is also the driver for
the "Dallas DS12887", I'm guessing there is some compatibility between the
lot that is working?

Alternatively you might have a different RTC chip on your board to me :(
This is going to make things annoying, if this is the case, unless TS have a
way to detect between the two if they are not effectively the same chip.

Cheers

Alex

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