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Commit 85f8879c authored by Thierry Reding's avatar Thierry Reding
Browse files

pwm: dt: Fix description of second PWM cell 



The second cell in the PWM specifier denotes the period in nanoseconds,
not the duty cycle. The latter can be freely configured at runtime and
a PWM with a fixed duty cycle would be rather pointless.

Signed-off-by: default avatarThierry Reding <thierry.reding@avionic-design.de>
Cc: Shawn Guo <shawn.guo@linaro.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Philipp Zabel <p.zabel@pengutronix.de>
Cc: "Benoît Thébaudeau" <benoit.thebaudeau@advansee.com>
Cc: Stephen Warren <swarren@wwwdotorg.org>
Acked-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
Acked-by: default avatarShawn Guo <shawn.guo@linaro.org>
parent c2d476a9

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

+1 −1
Original line number Diff line number Diff line
@@ -4,7 +4,7 @@ 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 duty cycle in nanoseconds.

  of the PWM to use and the second cell is the period in nanoseconds.

- interrupts: The interrupt for the pwm controller



Example:

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

+1 −1
Original line number Diff line number Diff line
@@ -4,7 +4,7 @@ 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 duty cycle in nanoseconds.

  of the PWM to use and the second cell is the period in nanoseconds.

- fsl,pwm-number: the number of PWM devices



Example:

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

+1 −1
Original line number Diff line number Diff line
@@ -7,7 +7,7 @@ Required properties: 
- 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 duty cycle in nanoseconds.

  cell is the period in nanoseconds.



Example: