On Monday 23 September 2013 15:24:37 Jürgen Beisert wrote: > Hi Lothar, > > On Monday 23 September 2013 14:12:02 Lothar Waßmann wrote: > > [...] > > > > > @Lothar: What kernel revision did you use? I had to go back to 3.9 to > > > get a > > > > Current linux-next (3.12-rc1). > > Okay. > > > > working kernel on the MX28EVK. More recent vanilla kernels stop working > > > (MMC and network fail here). > > > > I'm seeing some messages: > > |mxs-mmc 80010000.ssp: dummy supplies not allowed > > |fec 800f0000.ethernet: dummy supplies not allowed > > It was my fault. I'm also working with 3.12-rc1 now. > > > But without any apparent consequences. Maybe that's a problem with the > > MX28EVK? > > It seems the LRADC delay feature does not work. The touch detection > interrupt happens and the driver switches to the Y plate measurement, arms > the LRADC delay unit ... and nothing more happens. The LRADC delay unit > should start a conversion on ADC channel 4. But it does not. Never. > > The i.MX28 manual says the LRADC delay unit is driven by a 2 kHz clock, but > does not say what kind of clock it is (or is derived from). I guess now, > this clock isn't enabled and thus the delay unit can't work. At least on > the MX28EVK. On your TX28 platform the clock seems enabled and the delay > unit can do its job and drive the state machine. Hmmm: 24 MHz / 750 = CLK_32K / 16 = CLK_LRADC2K Regards, Juergen -- Pengutronix e.K. | Juergen Beisert | Linux Solutions for Science and Industry | Phone: +49-5121-206917-5128 | Peiner Str. 6-8, 31137 Hildesheim, Germany | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de/ | _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
