This patch adds the new devfreq_get_devfreq_by_phandle() OF helper function
which can find the instance of devfreq device by using phandle ("devfreq").

Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
[linux.amoon: Tested on Odroid U3]
Tested-by: Anand Moon <redacted>

Signed-off-by: MyungJoo Ham <myungjoo.ham@samsung.com>

---
 drivers/devfreq/devfreq.c | 44 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/devfreq.h   |  9 +++++++++
 2 files changed, 53 insertions(+)