diff options
| author | Hannes Schmelzer <hannes.schmelzer@br-automation.com> | 2021-10-01 14:37:57 +0300 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2021-10-19 18:25:24 +0300 |
| commit | bba76a17bd11b5700c2aeb4e7178ac8ac016849c (patch) | |
| tree | ef83c3e558f145ad57d44719527a215b49d4ac99 /doc/device-tree-bindings | |
| parent | 93b196532254366f653b4d763f69e49ff193f06c (diff) | |
| download | u-boot-bba76a17bd11b5700c2aeb4e7178ac8ac016849c.tar.xz | |
drivers/gpio: add support for MAX7320 i2c i/o expander
This commit adds support for the MAX7320 (and clones) gpio expander.
Signed-off-by: Hannes Schmelzer <hannes.schmelzer@br-automation.com>
Diffstat (limited to 'doc/device-tree-bindings')
| -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>; + }; + |