diff options
author | Andrew F. Davis <afd@ti.com> | 2016-03-04 12:58:44 -0600 |
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committer | Linus Walleij <linus.walleij@linaro.org> | 2016-03-15 09:54:28 +0100 |
commit | 45fe3fca6d5e9789dd274521180f364437d596e7 (patch) | |
tree | 26568708f2eb8eadd8f8562808b32bfadae9168d /Documentation | |
parent | fae98164463948eb31d638fe207c25a3d2b9312f (diff) | |
download | linux-45fe3fca6d5e9789dd274521180f364437d596e7.tar.bz2 |
gpio: Add generic serializer DT binding
Add binding for generic parallel-in/serial-out shift register devices
used as GPIO.
Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Rob Herring <robh@kernel.org>
[Clarified ngpios semantic]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'Documentation')
-rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio-pisosr.txt | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt new file mode 100644 index 000000000000..414a01cdf715 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-pisosr.txt @@ -0,0 +1,34 @@ +Generic Parallel-in/Serial-out Shift Register GPIO Driver + +This binding describes generic parallel-in/serial-out shift register +devices that can be used for GPI (General Purpose Input). This includes +SN74165 serial-out shift registers and the SN65HVS88x series of +industrial serializers. + +Required properties: + - compatible : Should be "pisosr-gpio". + - gpio-controller : Marks the device node as a GPIO controller. + - #gpio-cells : Should be two. For consumer use see gpio.txt. + +Optional properties: + - ngpios : Number of used GPIO lines (0..n-1), default is 8. + - load-gpios : GPIO pin specifier attached to load enable, this + pin is pulsed before reading from the device to + load input pin values into the the device. + +For other required and optional properties of SPI slave +nodes please refer to ../spi/spi-bus.txt. + +Example: + + gpio@0 { + compatible = "ti,sn65hvs882", "pisosr-gpio"; + gpio-controller; + #gpio-cells = <2>; + + load-gpios = <&gpio2 23 GPIO_ACTIVE_LOW>; + + reg = <0>; + spi-max-frequency = <1000000>; + spi-cpol; + }; |