0001 * NXP - pca955x LED driver
0002
0003 The PCA955x family of chips are I2C LED blinkers whose pins not used
0004 to control LEDs can be used as general purpose I/Os. The GPIO pins can
0005 be input or output, and output pins can also be pulse-width controlled.
0006
0007 Required properties:
0008 - compatible : should be one of :
0009 "nxp,pca9550"
0010 "nxp,pca9551"
0011 "nxp,pca9552"
0012 "ibm,pca9552"
0013 "nxp,pca9553"
0014 - #address-cells: must be 1
0015 - #size-cells: must be 0
0016 - reg: I2C slave address. depends on the model.
0017
0018 Optional properties:
0019 - gpio-controller: allows pins to be used as GPIOs.
0020 - #gpio-cells: must be 2.
0021 - gpio-line-names: define the names of the GPIO lines
0022
0023 LED sub-node properties:
0024 - reg : number of LED line.
0025 from 0 to 1 for the pca9550
0026 from 0 to 7 for the pca9551
0027 from 0 to 15 for the pca9552
0028 from 0 to 3 for the pca9553
0029 - type: (optional) either
0030 PCA955X_TYPE_NONE
0031 PCA955X_TYPE_LED
0032 PCA955X_TYPE_GPIO
0033 see dt-bindings/leds/leds-pca955x.h (default to LED)
0034 - label : (optional)
0035 see Documentation/devicetree/bindings/leds/common.txt
0036 - linux,default-trigger : (optional)
0037 see Documentation/devicetree/bindings/leds/common.txt
0038
0039 Examples:
0040
0041 pca9552: pca9552@60 {
0042 compatible = "nxp,pca9552";
0043 #address-cells = <1>;
0044 #size-cells = <0>;
0045 reg = <0x60>;
0046
0047 gpio-controller;
0048 #gpio-cells = <2>;
0049 gpio-line-names = "GPIO12", "GPIO13", "GPIO14", "GPIO15";
0050
0051 gpio@12 {
0052 reg = <12>;
0053 type = <PCA955X_TYPE_GPIO>;
0054 };
0055 gpio@13 {
0056 reg = <13>;
0057 type = <PCA955X_TYPE_GPIO>;
0058 };
0059 gpio@14 {
0060 reg = <14>;
0061 type = <PCA955X_TYPE_GPIO>;
0062 };
0063 gpio@15 {
0064 reg = <15>;
0065 type = <PCA955X_TYPE_GPIO>;
0066 };
0067
0068 led@0 {
0069 label = "red:power";
0070 linux,default-trigger = "default-on";
0071 reg = <0>;
0072 type = <PCA955X_TYPE_LED>;
0073 };
0074 led@1 {
0075 label = "green:power";
0076 reg = <1>;
0077 type = <PCA955X_TYPE_LED>;
0078 };
0079 led@2 {
0080 label = "pca9552:yellow";
0081 reg = <2>;
0082 type = <PCA955X_TYPE_LED>;
0083 };
0084 led@3 {
0085 label = "pca9552:white";
0086 reg = <3>;
0087 type = <PCA955X_TYPE_LED>;
0088 };
0089 };
