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author | Steffen Trumtrar <s.trumtrar@pengutronix.de> | 2013-05-30 09:50:12 +0200 |
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committer | Thierry Reding <thierry.reding@gmail.com> | 2013-06-12 13:13:18 +0200 |
commit | 88b613e6234def882b0b601bf831bf89af2e27f0 (patch) | |
tree | f864f8df0292c43ef902ac893fcb0fb66b7d8256 /Documentation/devicetree/bindings/pwm | |
parent | 8796f9c5656dedd186eda88c07db6a58d1985938 (diff) | |
download | op-kernel-dev-88b613e6234def882b0b601bf831bf89af2e27f0.zip op-kernel-dev-88b613e6234def882b0b601bf831bf89af2e27f0.tar.gz |
pwm: add pca9685 driver
Add pwm driver for the NXP pca9685 16 channel pwm-led controller.
The driver is really barebones at this stage. E.g. the OE' pin and
therefore the corresponding registers are not supported.
The driver was tested on a HW where this pin is tied to GND.
Signed-off-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
[thierry.reding@gmail.com: style and whitespace cleanups]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
Diffstat (limited to 'Documentation/devicetree/bindings/pwm')
-rw-r--r-- | Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt b/Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt new file mode 100644 index 0000000..1e3dfe7 --- /dev/null +++ b/Documentation/devicetree/bindings/pwm/nxp,pca9685-pwm.txt @@ -0,0 +1,27 @@ +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. + The index 16 is the ALLCALL channel, that sets all PWM channels at the same + time. + +Optional properties: + - invert (bool): boolean to enable inverted logic + - open-drain (bool): boolean to configure outputs with open-drain structure; + if omitted use totem-pole structure + +Example: + +For LEDs that are directly connected to the PCA, the following setting is +applicable: + +pca: pca@41 { + compatible = "nxp,pca9685-pwm"; + #pwm-cells = <2>; + reg = <0x41>; + invert; + open-drain; +}; |