Add dt-binding documentation of pwm for MediaTek MT8188 SoC.
Signed-off-by: Nxinlei lee <xinlei.lee@mediatek.com>
Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Acked-by: NKrzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: NThierry Reding <thierry.reding@gmail.com>