On 08/08/2011 02:48 PM, Robin Holt wrote: >>> OK. Dug a bit more. The p1010 built-in clocksource seems to be the >>> periphereal clock frequency which is system bus frequency divided >>> by 2. The clock source can not be changed, but the clock divider can >>> by freezing the interface and setting the CTRL register. This appears
>> Which bit(s) in the CTRL register is/are this? > PRESDIV bits 24-31. Documented on the P1010 reference manual section > 21.3.3.2. We have and use these bits on arm, too. These bits are calculated and set by the driver[1]. These bits are touched in freescale's 2.6.35 version of the flexcan driver, too. From my point of view it makes no sense to specify this divider in the OF-tree. We just need the frequency of the clock entering the flexcan core. Which is, as you say, the system bus freq/2. [1] http://lxr.linux.no/linux+v3.0.1/drivers/net/can/flexcan.c#L597 -- Pengutronix e.K. | Marc Kleine-Budde | Industrial Linux Solutions | Phone: +49-231-2826-924 | Vertretung West/Dortmund | Fax: +49-5121-206917-5555 | Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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