linux/Documentation/devicetree/bindings/gpio/gpio-mxs.txt
Shawn Guo c1cb438522 bindings: update imx and mxs #gpio-cells
The of_get_named_gpio_flags can retrieve the second cell of
gpio-specifier as the "flags".  The imx and mxs gpio driver do not
have their own .xlate callback, which means of_gpio_simple_xlate is
used and it's a 1:1 mapping between gpio controller flags and Linux
"enum of_gpio_flags".

Update imx and mxs bindings document to make it clear.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
2012-07-06 19:57:42 +08:00

89 lines
2.2 KiB
Plaintext

* Freescale MXS GPIO controller
The Freescale MXS GPIO controller is part of MXS PIN controller. The
GPIOs are organized in port/bank. Each port consists of 32 GPIOs.
As the GPIO controller is embedded in the PIN controller and all the
GPIO ports share the same IO space with PIN controller, the GPIO node
will be represented as sub-nodes of MXS pinctrl node.
Required properties for GPIO node:
- compatible : Should be "fsl,<soc>-gpio". The supported SoCs include
imx23 and imx28.
- interrupts : Should be the port interrupt shared by all 32 pins.
- 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 the gpio polarity:
0 = active high
1 = active low
- 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 bits[3:0] is used to specify 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.
Note: Each GPIO port should have an alias correctly numbered in "aliases"
node.
Examples:
aliases {
gpio0 = &gpio0;
gpio1 = &gpio1;
gpio2 = &gpio2;
gpio3 = &gpio3;
gpio4 = &gpio4;
};
pinctrl@80018000 {
compatible = "fsl,imx28-pinctrl", "simple-bus";
reg = <0x80018000 2000>;
gpio0: gpio@0 {
compatible = "fsl,imx28-gpio";
interrupts = <127>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
};
gpio1: gpio@1 {
compatible = "fsl,imx28-gpio";
interrupts = <126>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
};
gpio2: gpio@2 {
compatible = "fsl,imx28-gpio";
interrupts = <125>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
};
gpio3: gpio@3 {
compatible = "fsl,imx28-gpio";
interrupts = <124>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
};
gpio4: gpio@4 {
compatible = "fsl,imx28-gpio";
interrupts = <123>;
gpio-controller;
#gpio-cells = <2>;
interrupt-controller;
#interrupt-cells = <2>;
};
};