90 lines
1.9 KiB
Plaintext
90 lines
1.9 KiB
Plaintext
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* NXP - pca955x LED driver
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The PCA955x family of chips are I2C LED blinkers whose pins not used
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to control LEDs can be used as general purpose I/Os. The GPIO pins can
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be input or output, and output pins can also be pulse-width controlled.
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Required properties:
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- compatible : should be one of :
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"nxp,pca9550"
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"nxp,pca9551"
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"nxp,pca9552"
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"ibm,pca9552"
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"nxp,pca9553"
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- #address-cells: must be 1
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- #size-cells: must be 0
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- reg: I2C slave address. depends on the model.
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Optional properties:
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- gpio-controller: allows pins to be used as GPIOs.
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- #gpio-cells: must be 2.
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- gpio-line-names: define the names of the GPIO lines
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LED sub-node properties:
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- reg : number of LED line.
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from 0 to 1 for the pca9550
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from 0 to 7 for the pca9551
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from 0 to 15 for the pca9552
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from 0 to 3 for the pca9553
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- type: (optional) either
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PCA955X_TYPE_NONE
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PCA955X_TYPE_LED
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PCA955X_TYPE_GPIO
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see dt-bindings/leds/leds-pca955x.h (default to LED)
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- label : (optional)
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see Documentation/devicetree/bindings/leds/common.txt
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- linux,default-trigger : (optional)
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see Documentation/devicetree/bindings/leds/common.txt
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Examples:
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pca9552: pca9552@60 {
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compatible = "nxp,pca9552";
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#address-cells = <1>;
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#size-cells = <0>;
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reg = <0x60>;
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gpio-controller;
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#gpio-cells = <2>;
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gpio-line-names = "GPIO12", "GPIO13", "GPIO14", "GPIO15";
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gpio@12 {
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reg = <12>;
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type = <PCA955X_TYPE_GPIO>;
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};
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gpio@13 {
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reg = <13>;
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type = <PCA955X_TYPE_GPIO>;
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};
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gpio@14 {
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reg = <14>;
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type = <PCA955X_TYPE_GPIO>;
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};
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gpio@15 {
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reg = <15>;
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type = <PCA955X_TYPE_GPIO>;
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};
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led@0 {
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label = "red:power";
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linux,default-trigger = "default-on";
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reg = <0>;
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type = <PCA955X_TYPE_LED>;
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};
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led@1 {
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label = "green:power";
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reg = <1>;
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type = <PCA955X_TYPE_LED>;
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};
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led@2 {
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label = "pca9552:yellow";
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reg = <2>;
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type = <PCA955X_TYPE_LED>;
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};
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led@3 {
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label = "pca9552:white";
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reg = <3>;
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type = <PCA955X_TYPE_LED>;
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};
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};
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