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c1cb438522
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>
89 lines
2.2 KiB
Plaintext
89 lines
2.2 KiB
Plaintext
* Freescale MXS GPIO controller
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The Freescale MXS GPIO controller is part of MXS PIN controller. The
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GPIOs are organized in port/bank. Each port consists of 32 GPIOs.
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As the GPIO controller is embedded in the PIN controller and all the
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GPIO ports share the same IO space with PIN controller, the GPIO node
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will be represented as sub-nodes of MXS pinctrl node.
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Required properties for GPIO node:
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- compatible : Should be "fsl,<soc>-gpio". The supported SoCs include
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imx23 and imx28.
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- interrupts : Should be the port interrupt shared by all 32 pins.
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- gpio-controller : Marks the device node as a gpio controller.
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- #gpio-cells : Should be two. The first cell is the pin number and
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the second cell is used to specify the gpio polarity:
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0 = active high
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1 = active low
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- interrupt-controller: Marks the device node as an interrupt controller.
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- #interrupt-cells : Should be 2. The first cell is the GPIO number.
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The second cell bits[3:0] is used to specify trigger type and level flags:
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1 = low-to-high edge triggered.
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2 = high-to-low edge triggered.
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4 = active high level-sensitive.
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8 = active low level-sensitive.
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Note: Each GPIO port should have an alias correctly numbered in "aliases"
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node.
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Examples:
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aliases {
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gpio0 = &gpio0;
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gpio1 = &gpio1;
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gpio2 = &gpio2;
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gpio3 = &gpio3;
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gpio4 = &gpio4;
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};
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pinctrl@80018000 {
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compatible = "fsl,imx28-pinctrl", "simple-bus";
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reg = <0x80018000 2000>;
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gpio0: gpio@0 {
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compatible = "fsl,imx28-gpio";
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interrupts = <127>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio1: gpio@1 {
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compatible = "fsl,imx28-gpio";
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interrupts = <126>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio2: gpio@2 {
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compatible = "fsl,imx28-gpio";
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interrupts = <125>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio3: gpio@3 {
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compatible = "fsl,imx28-gpio";
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interrupts = <124>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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gpio4: gpio@4 {
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compatible = "fsl,imx28-gpio";
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interrupts = <123>;
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gpio-controller;
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#gpio-cells = <2>;
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interrupt-controller;
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#interrupt-cells = <2>;
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};
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};
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