gpio: dt-bindings: add brcm,bcm6345-gpio bindings

This patch adds the device tree bindings for the Broadcom's BCM6345
memory-mapped GPIO controllers.

The gpios will be supported by gpio-mmio code of the
GPIO generic library.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Álvaro Fernández Rojas 2016-08-03 14:05:56 +02:00 committed by Linus Walleij
parent de4b894182
commit c17c2db99c

View File

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Bindings for the Broadcom's brcm,bcm6345-gpio memory-mapped GPIO controllers.
These bindings can be used on any BCM63xx SoC. However, BCM6338 and BCM6345
are the only ones which don't need a pinctrl driver.
BCM6338 have 8-bit data and dirout registers, where GPIO state can be read
and/or written, and the direction changed from input to output.
BCM6345 have 16-bit data and dirout registers, where GPIO state can be read
and/or written, and the direction changed from input to output.
Required properties:
- compatible: should be "brcm,bcm6345-gpio"
- reg-names: must contain
"dat" - data register
"dirout" - direction (output) register
- reg: address + size pairs describing the GPIO register sets;
order must correspond with the order of entries in reg-names
- #gpio-cells: must be set to 2. The first cell is the pin number and
the 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.
Optional properties:
- native-endian: use native endian memory.
Examples:
- BCM6338:
gpio: gpio-controller@fffe0407 {
compatible = "brcm,bcm6345-gpio";
reg-names = "dirout", "dat";
reg = <0xfffe0407 1>, <0xfffe040f 1>;
#gpio-cells = <2>;
gpio-controller;
};
- BCM6345:
gpio: gpio-controller@fffe0406 {
compatible = "brcm,bcm6345-gpio";
reg-names = "dirout", "dat";
reg = <0xfffe0406 2>, <0xfffe040a 2>;
native-endian;
#gpio-cells = <2>;
gpio-controller;
};