Re: pcf8591 boot time parameters

[Randy.Dunlap]

Karel Kulhavy wrote:
> Is it possible to configure pcf8591 driver using boot time commandline
> parameters? 
>
> If yes, where are they described? I didn't find it. (<Help> doesn't say
> anything).  also /linux-2.6.10/Documentation/i2c$ fgrep PCF * didn't reveal
> anything related.
>
> I only found documentation for module parameters by means of modinfo pcf8591

and what did it tell you?  I see (when built as a loadable module,\
but they are still valid when built in-kernel):

parm:           force:List of adapter,address pairs to boldly assume 
to be present
parm:           force_pcf8591:List of adapter,address pairs which are 
unquestionably assumed to contain a `pcf8591' chip
parm:           probe:List of adapter,address pairs to scan additionally
parm:           ignore:List of adapter,address pairs not to scan
parm:           input_mode:Analog input mode:
 0 = four single ended inputs
 1 = three differential inputs
 2 = single ended and differential mixed
 3 = two differential inputs


It seems that there is a list of i2c client parameters in
Documentation/i2c/writing-clients .

I don't know i2c, but any driver that #includes
linux/i2c.h has defined for it these parameters:
  probe, probe_range
  ignore, ignore_range
  force

and any driver that #includes linux/i2c-sensor.h
has defined for it these parameters:
  force_<driver_basename>
  probe
  ignore
  force

but it would be better for someone who is familiar with those
twisted macros to document all of this.

--
~Randy
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