On Tue, 2014-12-23 at 14:49 +0100, Wolfram Sang wrote: > On Tue, Dec 23, 2014 at 02:23:01PM +0100, Valentin Longchamp wrote: > > Wolfgang, Scott, > > Wolfram, please. > > > > What is then the agreement here ? Add a clock-div to the device trees ? > > > Or do > > > something similar to mpc_i2c_get_sec_cfg_8xxx() ? > > > > > > I think the clock-div property is better according to Freescale's AN 2919 > > > section 3.1 Source clock. All the source clocks are fixed (with a > > > clock-div of 2 > > > in case of mpc8536/43/45/47/48/67/68/72, plus p2020) except for the > > > mpc8533/44 > > > where it can be 2 or 3, and that's what mpc_i2c_get_sec_cfg_8xxx() > > > determines. > > > > > > So mpc_i2c_get_sec_cfg_8xxx() should remain the exception and the other > > > prescaler values should be derived from an additional clock-div that must > > > be > > > added in the respective device trees (at least for the qoriq devices, > > > because > > > for instance mpc8543 already has the correct prescaler thanks to > > > mpc_i2c_data_8543 from i2c-mpc.c). > > > > > > > Do you have an opinion on the above ? > > I don't mind. I'll leave it to PowerPC experts to judge if a new binding > is apropriate or reading SVR is the way to go. If it is going to be a > new binding, then please look around before if there is already > something similar around...
I'd rather use SVR so things work with existing device trees. -Scott _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
