Document the st-pwm regulator

Signed-off-by: Chris Zhong <z...@rock-chips.com>

Adviced by Doug Anderson
- remove regulator-always-on and regulator-boot-on from the Example

Reviewed-by: Doug Anderson <diand...@chromium.org>
---

Changes in v4: None
Changes in v3:
Adviced by Doug Anderson
- update the Example

Changes in v2:
Adviced by Lee Jones
- rename the documentation
Adviced by Doug Anderson
- update the example
Adviced by Mark Rutland
- remove pwm-reg-period

 .../bindings/regulator/pwm-regulator.txt           |   27 ++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 
Documentation/devicetree/bindings/regulator/pwm-regulator.txt

diff --git a/Documentation/devicetree/bindings/regulator/pwm-regulator.txt 
b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
new file mode 100644
index 0000000..c6756a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/regulator/pwm-regulator.txt
@@ -0,0 +1,27 @@
+pwm regulator bindings
+
+Required properties:
+- compatible: Should be "pwm-regulator"
+- pwms: OF device-tree PWM specification (see PWM binding pwm.txt)
+- voltage-table: voltage and duty table, include 2 merbers in each set of
+  brackets, first one is voltage(unit: uv), the next is duty(unit: percent)
+
+Any property defined as part of the core regulator binding defined in
+regulator.txt can also be used.
+
+Example:
+       pwm_regulator {
+               compatible = "pwm-regulator;
+               pwms = <&pwm1 0 8448 0>;
+
+               voltage-table = <1114000 0>,
+                               <1095000 10>,
+                               <1076000 20>,
+                               <1056000 30>,
+                               <1036000 40>,
+                               <1016000 50>;
+
+               regulator-min-microvolt = <1016000>;
+               regulator-max-microvolt = <1114000>;
+               regulator-name = "vdd_logic";
+       };
-- 
1.7.9.5

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