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* Marvell EBU GPIO controller
Required properties:
- compatible : Should be "marvell,orion-gpio", "marvell,mv78200-gpio"
or "marvell,armadaxp-gpio". "marvell,orion-gpio" should be used for
Orion, Kirkwood, Dove, Discovery (except MV78200) and Armada
370. "marvell,mv78200-gpio" should be used for the Discovery
MV78200. "marvel,armadaxp-gpio" should be used for all Armada XP
SoCs (MV78230, MV78260, MV78460).
- reg: Address and length of the register set for the device. Only one
entry is expected, except for the "marvell,armadaxp-gpio" variant
for which two entries are expected: one for the general registers,
one for the per-cpu registers.
- interrupts: The list of interrupts that are used for all the pins
managed by this GPIO bank. There can be more than one interrupt
(example: 1 interrupt per 8 pins on Armada XP, which means 4
interrupts per bank of 32 GPIOs).
- interrupt-controller: identifies the node as an interrupt controller
- #interrupt-cells: specifies the number of cells needed to encode an
interrupt source. Should be two.
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.
- gpio-controller: marks the device node as a gpio controller
- ngpios: number of GPIOs this controller has
- #gpio-cells: Should be two. The first cell is the pin number. The
second cell is reserved for flags, unused at the moment.
Optional properties:
In order to use the GPIO lines in PWM mode, some additional optional
properties are required.
- compatible: Must contain "marvell,armada-370-gpio"
- reg: an additional register set is needed, for the GPIO Blink
Counter on/off registers.
- reg-names: Must contain an entry "pwm" corresponding to the
additional register range needed for PWM operation.
- #pwm-cells: Should be two. The first cell is the GPIO line number. The
second cell is the period in nanoseconds.
- clocks: Must be a phandle to the clock for the GPIO controller.
Example:
gpio0: gpio@d0018100 {
compatible = "marvell,armadaxp-gpio";
reg = <0xd0018100 0x40>,
<0xd0018800 0x30>;
ngpios = <32>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
interrupts = <16>, <17>, <18>, <19>;
};
gpio1: gpio@18140 {
compatible = "marvell,armada-370-gpio";
reg = <0x18140 0x40>, <0x181c8 0x08>;
reg-names = "gpio", "pwm";
ngpios = <17>;
gpio-controller;
#gpio-cells = <2>;
#pwm-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
interrupts = <87>, <88>, <89>;
clocks = <&coreclk 0>;
};
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