24ad02c48c
Document properties reg and interrupts for OMAP GPIO controller bindings Also add unit address in node name of the example Signed-off-by: Andreas Klinger <ak@it-klinger.de> Acked-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Rob Herring <robh@kernel.org>
46 lines
1.4 KiB
Plaintext
46 lines
1.4 KiB
Plaintext
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
|
|
- reg : Physical base address of the controller and length of memory mapped
|
|
region.
|
|
- 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.
|
|
- interrupts : The interrupt the controller is rising as output when an
|
|
interrupt occures
|
|
|
|
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:
|
|
|
|
gpio0: gpio@44e07000 {
|
|
compatible = "ti,omap4-gpio";
|
|
reg = <0x44e07000 0x1000>;
|
|
ti,hwmods = "gpio1";
|
|
gpio-controller;
|
|
#gpio-cells = <2>;
|
|
interrupt-controller;
|
|
#interrupt-cells = <2>;
|
|
interrupts = <96>;
|
|
};
|