arm64: dts: mediatek: mt7988: add PWM controller

MT7988 has on-SoC controller that can control up to 8 PWM interfaces.
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Link: https://lore.kernel.org/r/20240604064302.487-1-zajec5@gmail.comSigned-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

arch/arm64/boot/dts/mediatek/mt7988a.dtsi

@@ -105,6 +105,25 @@ clock-controller@1001e000 {
 			#clock-cells = <1>;
 		};
 
+		pwm@10048000 {
+			compatible = "mediatek,mt7988-pwm";
+			reg = <0 0x10048000 0 0x1000>;
+			clocks = <&infracfg CLK_INFRA_66M_PWM_BCK>,
+				 <&infracfg CLK_INFRA_66M_PWM_HCK>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK1>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK2>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK3>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK4>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK5>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK6>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK7>,
+				 <&infracfg CLK_INFRA_66M_PWM_CK8>;
+			clock-names = "top", "main", "pwm1", "pwm2", "pwm3",
+				      "pwm4", "pwm5", "pwm6", "pwm7", "pwm8";
+			#pwm-cells = <2>;
+			status = "disabled";
+		};
+
 		usb@11190000 {
 			compatible = "mediatek,mt7988-xhci", "mediatek,mtk-xhci";
 			reg = <0 0x11190000 0 0x2e00>,