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authorXiubo Li <Li.Xiubo@freescale.com>2014-08-19 12:38:03 +0800
committerThierry Reding <thierry.reding@gmail.com>2014-08-20 10:20:02 +0200
commita535e2e0debc2255fcf60a11d73fbb0534454cc3 (patch)
tree69bcc65e5e4f3fdaab249c638453fe87db7e2a39 /Documentation/devicetree/bindings/pwm
parent42fa98a9c3609c1aff466cb847e421c611cc9157 (diff)
pwm: fsl-ftm: Document 'big-endian' property
The same FTM PWM device can have a different endianness on different SoCs. The device tree provides a property to describing this so that an operating system device driver can handle all variants of the device. Refer to the table below for the endianness of the FTM PWM block as integrated into the existing SoCs: SoC | FTM-PWM endianness --------+------------------- Vybrid | LE LS1 | BE LS2 | LE Signed-off-by: Xiubo Li <Li.Xiubo@freescale.com> Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'Documentation/devicetree/bindings/pwm')
-rw-r--r--Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt19
1 files changed, 18 insertions, 1 deletions
diff --git a/Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt b/Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt
index 0bda229a6171..3899d6a557c1 100644
--- a/Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt
+++ b/Documentation/devicetree/bindings/pwm/pwm-fsl-ftm.txt
@@ -1,5 +1,20 @@
Freescale FlexTimer Module (FTM) PWM controller
+The same FTM PWM device can have a different endianness on different SoCs. The
+device tree provides a property to describing this so that an operating system
+device driver can handle all variants of the device. Refer to the table below
+for the endianness of the FTM PWM block as integrated into the existing SoCs:
+
+ SoC | FTM-PWM endianness
+ --------+-------------------
+ Vybrid | LE
+ LS1 | BE
+ LS2 | LE
+
+Please see ../regmap/regmap.txt for more detail about how to specify endian
+modes in device tree.
+
+
Required properties:
- compatible: Should be "fsl,vf610-ftm-pwm".
- reg: Physical base address and length of the controller's registers
@@ -16,7 +31,8 @@ Required properties:
- pinctrl-names: Must contain a "default" entry.
- pinctrl-NNN: One property must exist for each entry in pinctrl-names.
See pinctrl/pinctrl-bindings.txt for details of the property values.
-
+- big-endian: Boolean property, required if the FTM PWM registers use a big-
+ endian rather than little-endian layout.
Example:
@@ -32,4 +48,5 @@ pwm0: pwm@40038000 {
<&clks VF610_CLK_FTM0_EXT_FIX_EN>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_pwm0_1>;
+ big-endian;
};

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