[PATCH v4 6/10] dt-bindings: pwm: update bindings for MT7628 SoC

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From: sam shih <sam.shih@xxxxxxxxxxxx>

This updates bindings for MT7628 pwm controller.

Signed-off-by: Sam Shih <sam.shih@xxxxxxxxxxxx>
---
 Documentation/devicetree/bindings/pwm/pwm-mediatek.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt b/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
index ea95b490a913..bd644ba85762 100644
--- a/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
+++ b/Documentation/devicetree/bindings/pwm/pwm-mediatek.txt
@@ -20,6 +20,10 @@ Required properties:
  - pinctrl-0: One property must exist for each entry in pinctrl-names.
    See pinctrl/pinctrl-bindings.txt for details of the property values.
  - num-pwms: the number of PWM channels.
+
+ Optional properties:
+ - clock-frequency: fix clock frequency, this is only used in MT7628 SoC
+                    for period calculation. This SoC has no complex clock tree.
 
 Example:
 	pwm0: pwm@11006000 {
-- 
2.17.1




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