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yaml --- r: 328499 b: refs/heads/master c: e1b2dc7 h: refs/heads/master i: 328497: a5b8ba8 328495: eccc3f1 v: v3
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Simon Arlott
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Linus Walleij
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trunk/Documentation/devicetree/bindings/pinctrl/brcm,bcm2835-gpio.txt
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Broadcom BCM2835 GPIO (and pinmux) controller | ||
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The BCM2835 GPIO module is a combined GPIO controller, (GPIO) interrupt | ||
controller, and pinmux/control device. | ||
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Required properties: | ||
- compatible: "brcm,bcm2835-gpio" | ||
- reg: Should contain the physical address of the GPIO module's registes. | ||
- gpio-controller: Marks the device node as a GPIO controller. | ||
- #gpio-cells : Should be two. The first cell is the pin number and the | ||
second cell is used to specify optional parameters: | ||
- bit 0 specifies polarity (0 for normal, 1 for inverted) | ||
- interrupts : The interrupt outputs from the controller. One interrupt per | ||
individual bank followed by the "all banks" interrupt. | ||
- interrupt-controller: Marks 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. | ||
Valid combinations are 1, 2, 3, 4, 8. | ||
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Please refer to ../gpio/gpio.txt for a general description of GPIO bindings. | ||
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Please refer to pinctrl-bindings.txt in this directory for details of the | ||
common pinctrl bindings used by client devices, including the meaning of the | ||
phrase "pin configuration node". | ||
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Each pin configuration node lists the pin(s) to which it applies, and one or | ||
more of the mux function to select on those pin(s), and pull-up/down | ||
configuration. Each subnode only affects those parameters that are explicitly | ||
listed. In other words, a subnode that lists only a mux function implies no | ||
information about any pull configuration. Similarly, a subnode that lists only | ||
a pul parameter implies no information about the mux function. | ||
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Required subnode-properties: | ||
- brcm,pins: An array of cells. Each cell contains the ID of a pin. Valid IDs | ||
are the integer GPIO IDs; 0==GPIO0, 1==GPIO1, ... 53==GPIO53. | ||
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Optional subnode-properties: | ||
- brcm,function: Integer, containing the function to mux to the pin(s): | ||
0: GPIO in | ||
1: GPIO out | ||
2: alt5 | ||
3: alt4 | ||
4: alt0 | ||
5: alt1 | ||
6: alt2 | ||
7: alt3 | ||
- brcm,pull: Integer, representing the pull-down/up to apply to the pin(s): | ||
0: none | ||
1: down | ||
2: up | ||
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Each of brcm,function and brcm,pull may contain either a single value which | ||
will be applied to all pins in brcm,pins, or 1 value for each entry in | ||
brcm,pins. | ||
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Example: | ||
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gpio: gpio { | ||
compatible = "brcm,bcm2835-gpio"; | ||
reg = <0x2200000 0xb4>; | ||
interrupts = <2 17>, <2 19>, <2 18>, <2 20>; | ||
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gpio-controller; | ||
#gpio-cells = <2>; | ||
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interrupt-controller; | ||
#interrupt-cells = <2>; | ||
}; |
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