mediatek: pwm: add pwm driver for MediaTek SoCs

This driver support the standard PWM API for
MediaTek MT7623, MT7622 and MT7629 SoCs

Signed-off-by: Sam Shih <sam.shih@mediatek.com>
diff --git a/drivers/pwm/Kconfig b/drivers/pwm/Kconfig
index 1f36fc7..edb3f0f 100644
--- a/drivers/pwm/Kconfig
+++ b/drivers/pwm/Kconfig
@@ -23,6 +23,13 @@
 	help
 	  This PWM is found i.MX27 and later i.MX SoCs.
 
+config PWM_MTK
+	bool "Enable support for MediaTek PWM"
+	depends on DM_PWM
+	help
+	  This PWM is found on MT7622, MT7623, and MT7629. It supports a
+	  programmable period and duty cycle.
+
 config PWM_ROCKCHIP
 	bool "Enable support for the Rockchip PWM"
 	depends on DM_PWM