pwm: Update DT bindings to reference pwm.txt for cells documentation

The PWM client cells format is documented in the generic pwm.txt
documentation and duplicated in all PWM driver bindings. Remove
duplicate information and reference pwm.txt instead.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

Documentation/devicetree/bindings/pwm/atmel-tcb-pwm.txt

@@ -2,11 +2,9 @@ Atmel TCB PWM controller
 
 Required properties:
 - compatible: should be "atmel,tcb-pwm"
-- #pwm-cells: Should be 3.  The 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 cell in PWM specifier to 1 for inverse polarity &
-  set to 0 for normal polarity.
+- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
+  the cells format. The only third cell flag supported by this binding is
+  PWM_POLARITY_INVERTED.
 - tc-block: The Timer Counter block to use as a PWM chip.
 
 Example:

Documentation/devicetree/bindings/pwm/imx-pwm.txt

@@ -3,8 +3,8 @@ Freescale i.MX PWM controller
 Required properties:
 - compatible: should be "fsl,<soc>-pwm"
 - reg: physical base address and length of the controller's registers
-- #pwm-cells: should be 2.  The first cell specifies the per-chip index
-  of the PWM to use and the second cell is the period in nanoseconds.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
+  the cells format.
 - interrupts: The interrupt for the pwm controller
 
 Example:

Documentation/devicetree/bindings/pwm/mxs-pwm.txt

@@ -3,8 +3,8 @@ Freescale MXS PWM controller
 Required properties:
 - compatible: should be "fsl,imx23-pwm"
 - reg: physical base address and length of the controller's registers
-- #pwm-cells: should be 2.  The first cell specifies the per-chip index
-  of the PWM to use and the second cell is the period in nanoseconds.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
+  the cells format.
 - fsl,pwm-number: the number of PWM devices
 
 Example:

Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt

@@ -5,9 +5,8 @@ Required properties:
   - "nvidia,tegra20-pwm"
   - "nvidia,tegra30-pwm"
 - reg: physical base address and length of the controller's registers
-- #pwm-cells: On Tegra the number of cells used to specify a PWM is 2. The
-  first cell specifies the per-chip index of the PWM to use and the second
-  cell is the period in nanoseconds.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
+  the cells format.
 
 Example:
 

Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt

@@ -3,8 +3,8 @@ NXP PCA9685 16-channel 12-bit PWM LED controller
 
 Required properties:
   - compatible: "nxp,pca9685-pwm"
-  - #pwm-cells: should be 2. The first cell specifies the per-chip index
-    of the PWM to use and the second cell is the period in nanoseconds.
+  - #pwm-cells: Should be 2. See pwm.txt in this directory for a description of
+    the cells format.
     The index 16 is the ALLCALL channel, that sets all PWM channels at the same
     time.
 

Documentation/devicetree/bindings/pwm/pwm-samsung.txt

@@ -19,13 +19,9 @@ Required properties:
 - reg: base address and size of register area
 - interrupts: list of timer interrupts (one interrupt per timer, starting at
   timer 0)
-- #pwm-cells: number of cells used for PWM specifier - must be 3
-   the specifier format is as follows:
-     - phandle to PWM controller node
-     - index of PWM channel (from 0 to 4)
-     - PWM signal period in nanoseconds
-     - bitmask of optional PWM flags:
-        0x1 - invert PWM signal
+- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
+  the cells format. The only third cell flag supported by this binding is
+  PWM_POLARITY_INVERTED.
 
 Optional properties:
 - samsung,pwm-outputs: list of PWM channels used as PWM outputs on particular

Documentation/devicetree/bindings/pwm/pwm-tiecap.txt

@@ -4,11 +4,9 @@ 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.
+- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
+  the cells format. The PWM channel index ranges from 0 to 4. The only third
+  cell flag supported by this binding is PWM_POLARITY_INVERTED.
 - reg: physical base address and size of the registers map.
 
 Optional properties:

Documentation/devicetree/bindings/pwm/pwm-tiehrpwm.txt

@@ -4,11 +4,9 @@ Required properties:
 - compatible: Must be "ti,<soc>-ehrpwm".
   for am33xx - compatible = "ti,am33xx-ehrpwm";
   for da850  - compatible = "ti,da850-ehrpwm", "ti,am33xx-ehrpwm";
-- #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.
+- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
+  the cells format. The only third cell flag supported by this binding is
+  PWM_POLARITY_INVERTED.
 - reg: physical base address and size of the registers map.
 
 Optional properties:

Documentation/devicetree/bindings/pwm/spear-pwm.txt

@@ -5,9 +5,8 @@ Required properties:
   - "st,spear320-pwm"
   - "st,spear1340-pwm"
 - reg: physical base address and length of the controller's registers
-- #pwm-cells: number of cells used to specify PWM which is fixed to 2 on
-  SPEAr. The first cell specifies the per-chip index of the PWM to use and
-  the second cell is the period in nanoseconds.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
+  the cells format.
 
 Example:
 

Documentation/devicetree/bindings/pwm/ti,twl-pwm.txt

@@ -6,8 +6,8 @@ On TWL6030 series: PWM0 and PWM1
 
 Required properties:
 - compatible: "ti,twl4030-pwm" or "ti,twl6030-pwm"
-- #pwm-cells: should be 2.  The first cell specifies the per-chip index
-  of the PWM to use and the second cell is the period in nanoseconds.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
+  the cells format.
 
 Example:
 

Documentation/devicetree/bindings/pwm/ti,twl-pwmled.txt

@@ -6,8 +6,8 @@ On TWL6030 series: LED PWM (mainly used as charging indicator LED)
 
 Required properties:
 - compatible: "ti,twl4030-pwmled" or "ti,twl6030-pwmled"
-- #pwm-cells: should be 2.  The first cell specifies the per-chip index
-  of the PWM to use and the second cell is the period in nanoseconds.
+- #pwm-cells: should be 2. See pwm.txt in this directory for a description of
+  the cells format.
 
 Example:
 

Documentation/devicetree/bindings/pwm/vt8500-pwm.txt

@@ -3,11 +3,9 @@ VIA/Wondermedia VT8500/WM8xxx series SoC PWM controller
 Required properties:
 - compatible: should be "via,vt8500-pwm"
 - reg: physical base address and length of the controller's registers
-- #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.
+- #pwm-cells: should be 3. See pwm.txt in this directory for a description of
+  the cells format. The only third cell flag supported by this binding is
+  PWM_POLARITY_INVERTED.
 - clocks: phandle to the PWM source clock
 
 Example: