65 lines
2.3 KiB
Plaintext
Executable file
65 lines
2.3 KiB
Plaintext
Executable file
APM X-Gene Standby GPIO controller bindings
|
|
|
|
This is a gpio controller in the standby domain. It also supports interrupt in
|
|
some particular pins which are sourced to its parent interrupt controller
|
|
as diagram below:
|
|
+-----------------+
|
|
| X-Gene standby |
|
|
| GPIO controller +------ GPIO_0
|
|
+------------+ | | ...
|
|
| Parent IRQ | EXT_INT_0 | +------ GPIO_8/EXT_INT_0
|
|
| controller | (SPI40) | | ...
|
|
| (GICv2) +--------------+ +------ GPIO_[N+8]/EXT_INT_N
|
|
| | ... | |
|
|
| | EXT_INT_N | +------ GPIO_[N+9]
|
|
| | (SPI[40 + N])| | ...
|
|
| +--------------+ +------ GPIO_MAX
|
|
+------------+ +-----------------+
|
|
|
|
Required properties:
|
|
- compatible: "apm,xgene-gpio-sb" for the X-Gene Standby GPIO controller
|
|
- reg: Physical base address and size of the controller's registers
|
|
- #gpio-cells: Should be two.
|
|
- first cell is the pin number
|
|
- second cell is used to specify the gpio polarity:
|
|
0 = active high
|
|
1 = active low
|
|
- gpio-controller: Marks the device node as a GPIO controller.
|
|
- interrupts: The EXT_INT_0 parent interrupt resource must be listed first.
|
|
- interrupt-cells: Should be two.
|
|
- first cell is 0-N coresponding for EXT_INT_0 to EXT_INT_N.
|
|
- second cell is used to specify flags.
|
|
- interrupt-controller: Marks the device node as an interrupt controller.
|
|
- apm,nr-gpios: Optional, specify number of gpios pin.
|
|
- apm,nr-irqs: Optional, specify number of interrupt pins.
|
|
- apm,irq-start: Optional, specify lowest gpio pin support interrupt.
|
|
|
|
Example:
|
|
sbgpio: gpio@17001000{
|
|
compatible = "apm,xgene-gpio-sb";
|
|
reg = <0x0 0x17001000 0x0 0x400>;
|
|
#gpio-cells = <2>;
|
|
gpio-controller;
|
|
interrupts = <0x0 0x28 0x1>,
|
|
<0x0 0x29 0x1>,
|
|
<0x0 0x2a 0x1>,
|
|
<0x0 0x2b 0x1>,
|
|
<0x0 0x2c 0x1>,
|
|
<0x0 0x2d 0x1>;
|
|
interrupt-parent = <&gic>;
|
|
#interrupt-cells = <2>;
|
|
interrupt-controller;
|
|
apm,nr-gpios = <22>;
|
|
apm,nr-irqs = <6>;
|
|
apm,irq-start = <8>;
|
|
};
|
|
|
|
testuser {
|
|
compatible = "example,testuser";
|
|
/* Use the GPIO_13/EXT_INT_5 line as an active high triggered
|
|
* level interrupt
|
|
*/
|
|
interrupts = <5 4>;
|
|
interrupt-parent = <&sbgpio>;
|
|
};
|