Messages in this thread | | | Subject | Re: Changing the current RTC device interface | From | Alan Cox <> | Date | 28 May 2002 16:46:35 +0100 |
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On Tue, 2002-05-28 at 15:24, Abraham vd Merwe wrote: > I have a board with multiple RTC chips (Built-in RTC in the processor + > external battery backed RTC). > > There are pros and cons to each RTC chip. The CPU's RTC doesn't have a > battery, but have high resolution timing + multiple rtc counters/interrupts, > so it is especially suited for apps that want to use /dev/rtc for high > resolution timing. > > On the other hand the external RTC chip can keep time, but its timing is > crap (1hz to 8khz in steps of powers of two), so you don't want to use that > for timing. > > At the moment, Linux only allows for a single RTC device, so one can't reap > the benefits of both chips mentioned above. > > How about we get a major number assigned to rtc subsystem and then allows > for multiple rtc devices.
I think you should wait until 2.5 has reached the point we have a finished devicefs and 32bit dev_t. Basically we don't have enough device numbering left for such trivialities right now.
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