Explanation of several properties, which allow PWM fan working as a cooling
device, have been embraced in this commit.
Signed-off-by: NLukasz Majewski <l.majewski@samsung.com>
Acked-by: NEduardo Valentin <edubezval@gmail.com>
Acked-by: NKrzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: NKukjin Kim <kgene@kernel.org>