Re: [PATCH 1/2 V2] MXS: Set I2C timing registers for mxs-i2c

[Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>]

On Sat, Jun 09, 2012 at 12:34:47PM +0200, Marek Vasut wrote:
> Dear Shubhrajyoti Datta,
> 
> 
> > Didnt understand this.
> 
> What exactly, it's running (according to the datasheet) at 95kHz.
> 
> > > +       .timing0        = 0x00780030,
> > > +       .timing1        = 0x00800030,
> > > +       .timing2        = 0x0015000d,
> > > +};
> > > +
> > > +const struct mxs_i2c_speed_config mxs_i2c_400kHz_config = {
> > > +       .timing0        = 0x000f0007,
> > > +       .timing1        = 0x001f000f,
> > > +       .timing2        = 0x0015000d,
> > > +};
> > > +
> > 
> > How are these values calculated?
> 
> They're not calculated, they're presented in the datasheet. There's no formula, 
> even though I believe one could be derived given enough effort.

Don't these values depend on the input clock of this unit? I don't know,
just asking.

Sascha


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