89 lines
2.4 KiB
Plaintext
89 lines
2.4 KiB
Plaintext
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ImgTec TZ1090 GPIO Controller
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Required properties:
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- compatible: Compatible property value should be "img,tz1090-gpio".
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- reg: Physical base address of the controller and length of memory mapped
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region.
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- #address-cells: Should be 1 (for bank subnodes)
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- #size-cells: Should be 0 (for bank subnodes)
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- Each bank of GPIOs should have a subnode to represent it.
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Bank subnode required properties:
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- reg: Index of bank in the range 0 to 2.
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- gpio-controller: Specifies that the node is a gpio controller.
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- #gpio-cells: Should be 2. The syntax of the gpio specifier used by client
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nodes should have the following values.
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<[phandle of the gpio controller node]
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[gpio number within the gpio bank]
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[gpio flags]>
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Values for gpio specifier:
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- GPIO number: a value in the range 0 to 29.
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- GPIO flags: bit field of flags, as defined in <dt-bindings/gpio/gpio.h>.
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Only the following flags are supported:
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GPIO_ACTIVE_HIGH
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GPIO_ACTIVE_LOW
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Bank subnode optional properties:
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- gpio-ranges: Mapping to pin controller pins (as described in
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Documentation/devicetree/bindings/gpio/gpio.txt)
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- interrupts: Interrupt for the entire bank
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- interrupt-controller: Specifies that the node is an interrupt controller
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- #interrupt-cells: Should be 2. The syntax of the interrupt specifier used by
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client nodes should have the following values.
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<[phandle of the interurupt controller]
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[gpio number within the gpio bank]
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[irq flags]>
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Values for irq specifier:
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- GPIO number: a value in the range 0 to 29
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- IRQ flags: value to describe edge and level triggering, as defined in
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<dt-bindings/interrupt-controller/irq.h>. Only the following flags are
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supported:
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IRQ_TYPE_EDGE_RISING
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IRQ_TYPE_EDGE_FALLING
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IRQ_TYPE_EDGE_BOTH
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IRQ_TYPE_LEVEL_HIGH
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IRQ_TYPE_LEVEL_LOW
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Example:
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gpios: gpio-controller@02005800 {
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#address-cells = <1>;
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#size-cells = <0>;
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compatible = "img,tz1090-gpio";
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reg = <0x02005800 0x90>;
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/* bank 0 with an interrupt */
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gpios0: bank@0 {
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#gpio-cells = <2>;
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#interrupt-cells = <2>;
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reg = <0>;
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interrupts = <13 IRQ_TYPE_LEVEL_HIGH>;
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gpio-controller;
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gpio-ranges = <&pinctrl 0 0 30>;
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interrupt-controller;
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};
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/* bank 2 without interrupt */
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gpios2: bank@2 {
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#gpio-cells = <2>;
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reg = <2>;
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gpio-controller;
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gpio-ranges = <&pinctrl 0 60 30>;
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};
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};
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