Re: OPP: how to get the all frequency list?

[Viresh Kumar <viresh.kumar@linaro.org>]

On 21-08-17, 17:53, Chanwoo Choi wrote:
> Dear all,
> 
> I have a question that how to get the all frequency list
> by using the OPP interface. (It doesn't matter whether frequency is available or not.)
> 
> OPP has following three functions in order to find the proper frequency.
> - dev_pm_opp_find_freq_exact(struct device *dev, unsigned long freq, bool available);
> - dev_pm_opp_find_freq_floor(struct device *dev, unsigned long freq);
> 	: Search for a rounded floor freq (if opp->available is true)
> - dev_pm_opp_find_freq_ceil(struct device *dev, unsigned long freq);
> 	: Search for a rounded ceil freq if (opp->available is true)
> 
> In this case,
> when the device using OPP tries to find the all frequencies,
> the device can't find them. The device can just find the available frequencies.
> 
> If the some frequency of the device might be disabled by dev_pm_opp_disable()
> and also the device doesn't know the correct frequency value,
> the device cannot find the all frequencies by using the dev_pm_opp_find_freq_floor/ceil()
> 
> It is just able to find the available frequencies if opp->available is true.

You can add the 'available' argument to the other APIs as well, just that you
need to justify them with proper examples.

-- 
viresh