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| -rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio-omap.txt | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-omap.txt b/Documentation/devicetree/bindings/gpio/gpio-omap.txt new file mode 100644 index 000000000..8d950522e --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-omap.txt @@ -0,0 +1,39 @@ +OMAP GPIO controller bindings + +Required properties: +- compatible: + - "ti,omap2-gpio" for OMAP2 controllers + - "ti,omap3-gpio" for OMAP3 controllers + - "ti,omap4-gpio" for OMAP4 controllers +- gpio-controller : Marks the device node as a GPIO controller. +- #gpio-cells : Should be two. + - first cell is the pin number + - second cell is used to specify optional parameters (unused) +- interrupt-controller: Mark the device node as an interrupt controller. +- #interrupt-cells : Should be 2. + The first cell is the GPIO number. + The second cell is used to specify flags: + bits[3:0] trigger type and level flags: + 1 = low-to-high edge triggered. + 2 = high-to-low edge triggered. + 4 = active high level-sensitive. + 8 = active low level-sensitive. + +OMAP specific properties: +- ti,hwmods: Name of the hwmod associated to the GPIO: + "gpio<X>", <X> being the 1-based instance number + from the HW spec. +- ti,gpio-always-on: Indicates if a GPIO bank is always powered and + so will never lose its logic state. + + +Example: + +gpio4: gpio4 { + compatible = "ti,omap4-gpio"; + ti,hwmods = "gpio4"; + gpio-controller; + #gpio-cells = <2>; + interrupt-controller; + #interrupt-cells = <2>; +}; |