On Mon, Aug 08, 2011 at 02:07:32PM +0200, Marc Kleine-Budde wrote: > On 08/08/2011 01:31 PM, Robin Holt wrote: > > On Mon, Aug 08, 2011 at 10:37:58AM +0200, Wolfgang Grandegger wrote: > >> On 08/06/2011 04:34 PM, Robin Holt wrote: > >>> flexcan driver needs the clk_get, clk_get_rate, etc functions > >>> to work. This patch provides the minimum functionality. > >> > >> This needs some more general thoughts... apart from the question where > >> the code should go. > >> > >> Like for the MSCAN on the MPC5200, the user should be *able* to select > >> an appropriate clock source and divider via DTS node properties. > >> Currently it seems, that the DTS properties must match some > >> pre-configured values, most likely set by the boot loader. Please > >> correct me if I'm wrong. For me this is generic and should go into the > >> Flexcan driver. From there, a platform specific function, e.g. > >> flexcan_set_clock() might be called. > > > > 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. Robin _______________________________________________ Socketcan-core mailing list [email protected] https://lists.berlios.de/mailman/listinfo/socketcan-core
