linux-kernel - [PATCH] pwm: dt: Fix description of second PWM cell

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Date:	Mon,  1 Oct 2012 08:47:33 +0200
From:	Thierry Reding <thierry.reding@...onic-design.de>
To:	linux-kernel@...r.kernel.org
Cc:	Shawn Guo <shawn.guo@...aro.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Philipp Zabel <p.zabel@...gutronix.de>,
	Benoît Thébaudeau 
	<benoit.thebaudeau@...ansee.com>,
	Stephen Warren <swarren@...dotorg.org>
Subject: [PATCH] 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: Thierry Reding <thierry.reding@...onic-design.de>
Cc: Shawn Guo <shawn.guo@...aro.org>
Cc: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Philipp Zabel <p.zabel@...gutronix.de>
Cc: "Benoît Thébaudeau" <benoit.thebaudeau@...ansee.com>
Cc: Stephen Warren <swarren@...dotorg.org>
---
 Documentation/devicetree/bindings/pwm/imx-pwm.txt            | 2 +-
 Documentation/devicetree/bindings/pwm/mxs-pwm.txt            | 2 +-
 Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/devicetree/bindings/pwm/imx-pwm.txt b/Documentation/devicetree/bindings/pwm/imx-pwm.txt
index 9b9b185..8522bfb 100644
--- a/Documentation/devicetree/bindings/pwm/imx-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/imx-pwm.txt
@@ -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:
diff --git a/Documentation/devicetree/bindings/pwm/mxs-pwm.txt b/Documentation/devicetree/bindings/pwm/mxs-pwm.txt
index b16f4a5..d7946be6 100644
--- a/Documentation/devicetree/bindings/pwm/mxs-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/mxs-pwm.txt
@@ -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:
diff --git a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt b/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
index bbbeedb..01438ec 100644
--- a/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
+++ b/Documentation/devicetree/bindings/pwm/nvidia,tegra20-pwm.txt
@@ -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:
 
-- 
1.7.12.2

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