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Diffstat (limited to 'doc/device-tree-bindings/gpio/gpio-max7320.txt')
| -rw-r--r-- | doc/device-tree-bindings/gpio/gpio-max7320.txt | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/gpio/gpio-max7320.txt b/doc/device-tree-bindings/gpio/gpio-max7320.txt new file mode 100644 index 0000000000..87b703bb69 --- /dev/null +++ b/doc/device-tree-bindings/gpio/gpio-max7320.txt @@ -0,0 +1,36 @@ +* MAX7320 I/O expanders + +The original maxim 7320 i/o expander offers 8 bit push/pull outputs. +There exists some clones which offers 16 bit. + +Required Properties: + + - compatible: should be one of the following. + - "maxim,max7320" + + - reg: I2C slave address. + + - gpio-controller: Marks the device node as a gpio controller. + - #gpio-cells: Should be 2. The first cell is the GPIO number and the second + cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>. Only the + GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported. + +Optional Properties: + + - ngpios: tell the driver how many gpios the device offers. + if the property is omitted, 8bit (original maxim) is assumed. + +Please refer to gpio.txt in this directory for details of the common GPIO +bindings used by client devices. + +Example: MAX7320 I/O expander node + + ledgpio: max7320@5d { + status = "okay"; + compatible = "maxim,max7320"; + reg = <0x5d>; + #gpio-cells = <2>; + gpio-controller; + ngpios = <16>; + }; + |