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gpio: X-Gene standby GPIO controller DTS binding 

Update description for X-Gene standby GPIO controller DTS binding to
support GPIO line configuration as input, output or external IRQ pin.

Signed-off-by: Y Vo <yvo@apm.com>
Signed-off-by: Quan Nguyen <qnguyen@apm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Quan Nguyen 2016-02-17 20:15:08 +07:00 committed by Linus Walleij
parent 1013fc417c
commit 8cae5f9740
1 changed files with 40 additions and 7 deletions
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47
Documentation/devicetree/bindings/gpio/gpio-xgene-sb.txt
View File

@ -1,10 +1,20 @@
APM X-Gene Standby GPIO controller bindings
This is a gpio controller in the standby domain.
There are 20 GPIO pins from 0..21. There is no GPIO_DS14 or GPIO_DS15,
only GPIO_DS8..GPIO_DS13 support interrupts. The IRQ mapping
is currently 1-to-1 on interrupts 0x28 thru 0x2d.
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
@ -15,10 +25,18 @@ Required properties:
0 = active high
1 = active low
- gpio-controller: Marks the device node as a GPIO controller.
- interrupts: Shall contain exactly 6 interrupts.
- interrupts: The EXT_INT_0 parent interrupt resource must be listed first.
- interrupt-parent: Phandle of the parent interrupt controller.
- 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: sbgpio@17001000 {
sbgpio: gpio@17001000{
compatible = "apm,xgene-gpio-sb";
reg = <0x0 0x17001000 0x0 0x400>;
#gpio-cells = <2>;
@ -29,4 +47,19 @@ Example:
<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>;
};