mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
790b520e3a
Instead of having to duplicate the description of the properties needed for interrupt support, reference the new standard document. Cc: Grant Likely <grant.likely@secretlab.ca> Cc: Rob Herring <rob.herring@calxeda.com> Cc: devicetree-discuss@lists.ozlabs.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de> [Minor spelling correction] Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
35 lines
1.0 KiB
Plaintext
35 lines
1.0 KiB
Plaintext
Avionic Design N-bit GPIO expander bindings
|
|
|
|
Required properties:
|
|
- compatible: should be "ad,gpio-adnp"
|
|
- reg: The I2C slave address for this device.
|
|
- interrupt-parent: phandle of the parent interrupt controller.
|
|
- interrupts: Interrupt specifier for the controllers interrupt.
|
|
- #gpio-cells: Should be 2. The first cell is the GPIO number and the
|
|
second cell is used to specify optional parameters:
|
|
- bit 0: polarity (0: normal, 1: inverted)
|
|
- gpio-controller: Marks the device as a GPIO controller
|
|
- nr-gpios: The number of pins supported by the controller.
|
|
|
|
The GPIO expander can optionally be used as an interrupt controller, in
|
|
which case it uses the default two cell specifier as described in
|
|
Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
|
|
|
|
Example:
|
|
|
|
gpioext: gpio-controller@41 {
|
|
compatible = "ad,gpio-adnp";
|
|
reg = <0x41>;
|
|
|
|
interrupt-parent = <&gpio>;
|
|
interrupts = <160 1>;
|
|
|
|
gpio-controller;
|
|
#gpio-cells = <2>;
|
|
|
|
interrupt-controller;
|
|
#interrupt-cells = <2>;
|
|
|
|
nr-gpios = <64>;
|
|
};
|