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pwm: dt: Fix description of second PWM cell

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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: Thierry 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: Sascha Hauer <s.hauer@pengutronix.de>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
This commit is contained in:
Thierry Reding 2012-10-01 08:41:23 +02:00
parent c2d476a98f
commit 85f8879ca4
3 changed files with 3 additions and 3 deletions
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2
Documentation/devicetree/bindings/pwm/imx-pwm.txt
View File

@ -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:

2
Documentation/devicetree/bindings/pwm/mxs-pwm.txt
View File

@ -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:

2
Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
View File

@ -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: