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diff --git a/Documentation/devicetree/bindings/pwm/pwm-tiecap.txt b/Documentation/devicetree/bindings/pwm/pwm-tiecap.txt
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+TI SOC ECAP based APWM controller
+
+Required properties:
+- compatible: Must be "ti,<soc>-ecap".
+  for am33xx - compatible = "ti,am33xx-ecap";
+  for da850  - compatible = "ti,da850-ecap", "ti,am33xx-ecap";
+- #pwm-cells: Should be 3. Number of cells being used to specify PWM property.
+  First cell specifies the per-chip index of the PWM to use, the second
+  cell is the period in nanoseconds and bit 0 in the third cell is used to
+  encode the polarity of PWM output. Set bit 0 of the third in PWM specifier
+  to 1 for inverse polarity & set to 0 for normal polarity.
+- reg: physical base address and size of the registers map.
+
+Optional properties:
+- ti,hwmods: Name of the hwmod associated to the ECAP:
+  "ecap<x>", <x> being the 0-based instance number from the HW spec
+
+Example:
+
+ecap0: ecap@0 { /* ECAP on am33xx */
+	compatible = "ti,am33xx-ecap";
+	#pwm-cells = <3>;
+	reg = <0x48300100 0x80>;
+	ti,hwmods = "ecap0";
+};
+
+ecap0: ecap@0 { /* ECAP on da850 */
+	compatible = "ti,da850-ecap", "ti,am33xx-ecap";
+	#pwm-cells = <3>;
+	reg = <0x306000 0x80>;
+};