ARM: dts: aspeed: wedge40: Enable pwm_tacho device

Enable pwm_tacho device for fan control and monitoring in Wedge40.

Signed-off-by: Tao Ren <[e-mail]>
Signed-off-by: Joel Stanley <[e-mail]>

arch/arm/boot/dts/aspeed-bmc-facebook-wedge40.dts

···
 &adc {
 	status = "okay";
 };
+
+&pwm_tacho {
+	status = "okay";
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pwm0_default
+		     &pinctrl_pwm1_default
+		     &pinctrl_pwm6_default
+		     &pinctrl_pwm7_default>;
+
+	fan@0 {
+		reg = <0x00>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x00 0x01>;
+	};
+
+	fan@1 {
+		reg = <0x01>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x02 0x03>;
+	};
+
+	fan@6 {
+		reg = <0x06>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x04 0x05>;
+	};
+
+	fan@7 {
+		reg = <0x07>;
+		aspeed,fan-tach-ch = /bits/ 8 <0x06 0x07>;
+	};
+};