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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>
28 lines
791 B
Plaintext
28 lines
791 B
Plaintext
NXP PCA9685 16-channel 12-bit PWM LED controller
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Required properties:
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- compatible: "nxp,pca9685-pwm"
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- #pwm-cells: should be 2. The first cell specifies the per-chip index
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of the PWM to use and the second cell is the period in nanoseconds.
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The index 16 is the ALLCALL channel, that sets all PWM channels at the same
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time.
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Optional properties:
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- invert (bool): boolean to enable inverted logic
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- open-drain (bool): boolean to configure outputs with open-drain structure;
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if omitted use totem-pole structure
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Example:
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For LEDs that are directly connected to the PCA, the following setting is
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applicable:
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pca: pca@41 {
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compatible = "nxp,pca9685-pwm";
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#pwm-cells = <2>;
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reg = <0x41>;
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invert;
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open-drain;
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};
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