Re: [PATCH V5 4/7] cpufreq: add clk-reg cpufreq driver

[Mark Brown <broonie@opensource.wolfsonmicro.com>]

On Wed, Dec 28, 2011 at 08:05:20PM +0800, Richard Zhao wrote:

Looks like the problem with your mail client is that it's wrapping at
exactly 80 characters which is too little - you need to leave space for
being quoted.

> On Wed, Dec 28, 2011 at 11:42:37AM +0000, Mark Brown wrote:

> > You can't usefully work with voltages without knowing what the actual
> > voltages are - the only sensible stubs we could provide would return
> > errors but then any driver using the stubs would probably fail to do
> > whatever it was doing.  With enable and disable we can sensibly stub
> > things out with an always on regulator.

> Sorry, I can not get your point here. Let me describe the problem I met:

>  - regulator_is_supported_voltage is not exported. when I build clk-reg-cpufreq
>    as kernel module, there's a link error.

This is an oversight, I've just fixed it.

>  - I saw linux/regulator/consumer.h has some dummy functions if !REGULATOR. I
>    tried to make clk-reg-cpufreq driver work even !REGULATOR. I think that's
>    why the dummy functions are there. If regulator_get return NULL, it'll avoid
>    calling other regulator functions. But regulator_is_supported_voltage and
>    regulator_set_voltage_time don't have such dummy ones. Undefined functions.

I can only repeat what I wrote above explaining why no stubs are
provided.