Hi Russell King, On jeu., févr. 16 2017, Russell King - ARM Linux <[email protected]> wrote:
> On Thu, Feb 16, 2017 at 05:33:48PM +0000, Russell King - ARM Linux wrote: >> On Thu, Feb 16, 2017 at 04:31:33PM +0100, Gregory CLEMENT wrote: >> > The Armada 7K/8K SoCs use the same RTC IP than the Armada 38x. However >> > the SOC integration differs in 2 points: >> > - MBUS bridge timing initialization >> > - IRQ configuration at SoC level >> > >> > This patch set extends the driver support to these SoCs family. >> >> I've just tried merging this into my kernel, and... >> >> root@mcbin:~# date >> Thu Feb 16 17:33:00 GMT 2017 >> root@mcbin:~# hwclock -uw >> root@mcbin:~# hwclock >> Sun 07 Feb 2106 01:49:51 GMT -10.010475 seconds >> root@mcbin:~# hwclock >> Sun 07 Feb 2106 01:49:51 GMT -10.010458 seconds >> >> I guess it needs the same hack that Armada38x needs - "date reset" twice >> in uboot? > > Hmm, even with that sorted: > > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:35:50 GMT -0.786571 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:35:51 GMT -1.347541 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:35:52 GMT -1.889295 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:35:53 GMT -1.787338 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:35:54 GMT -1.444397 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:35:55 GMT -1.419772 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:35:58 GMT -2.555282 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:36:09 GMT -0.515289 seconds > root@mcbin:~# hwclock > Thu 16 Feb 2017 17:36:11 GMT -1.773030 seconds > root@mcbin:~# > > I think this RTC is a random number generator. It's certainly not > a reliable indication of time. I found the root of this issue. I tested on Aramda 7040 whihc have onle the CP master. But actually the RTC is present in each CPM (master and slave). And it occurs that the RTC requires an external oscillator. However on the Armada 80x0, the RTC clock in CP master is not connected (by package) to the oscillator. But the one in CP slave is connected. So I am sending a new version of the series with an updated device tree allowing using the RTC from CP slave in 80x0 instead of the one from CP master. Gregory > > -- > RMK's Patch system: http://www.armlinux.org.uk/developer/patches/ > FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up > according to speedtest.net. -- Gregory Clement, Free Electrons Kernel, drivers, real-time and embedded Linux development, consulting, training and support. http://free-electrons.com -- You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. --- You received this message because you are subscribed to the Google Groups "rtc-linux" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
