diff options
Diffstat (limited to 'drivers/devfreq/devfreq.c')
| -rw-r--r-- | drivers/devfreq/devfreq.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/drivers/devfreq/devfreq.c b/drivers/devfreq/devfreq.c index a1c4ee818614..6a6f88bccdee 100644 --- a/drivers/devfreq/devfreq.c +++ b/drivers/devfreq/devfreq.c @@ -69,6 +69,34 @@ static struct devfreq *find_device_devfreq(struct device *dev) return ERR_PTR(-ENODEV); } +static unsigned long find_available_min_freq(struct devfreq *devfreq) +{ + struct dev_pm_opp *opp; + unsigned long min_freq = 0; + + opp = dev_pm_opp_find_freq_ceil(devfreq->dev.parent, &min_freq); + if (IS_ERR(opp)) + min_freq = 0; + else + dev_pm_opp_put(opp); + + return min_freq; +} + +static unsigned long find_available_max_freq(struct devfreq *devfreq) +{ + struct dev_pm_opp *opp; + unsigned long max_freq = ULONG_MAX; + + opp = dev_pm_opp_find_freq_floor(devfreq->dev.parent, &max_freq); + if (IS_ERR(opp)) + max_freq = 0; + else + dev_pm_opp_put(opp); + + return max_freq; +} + /** * devfreq_get_freq_level() - Lookup freq_table for the frequency * @devfreq: the devfreq instance @@ -559,6 +587,20 @@ struct devfreq *devfreq_add_device(struct device *dev, mutex_lock(&devfreq->lock); } + devfreq->min_freq = find_available_min_freq(devfreq); + if (!devfreq->min_freq) { + mutex_unlock(&devfreq->lock); + err = -EINVAL; + goto err_dev; + } + + devfreq->max_freq = find_available_max_freq(devfreq); + if (!devfreq->max_freq) { + mutex_unlock(&devfreq->lock); + err = -EINVAL; + goto err_dev; + } + dev_set_name(&devfreq->dev, "devfreq%d", atomic_inc_return(&devfreq_no)); err = device_register(&devfreq->dev); |