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Diffstat (limited to 'Documentation/devicetree/bindings/gpio/gpio-tz1090.txt')
| -rw-r--r-- | Documentation/devicetree/bindings/gpio/gpio-tz1090.txt | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/gpio/gpio-tz1090.txt b/Documentation/devicetree/bindings/gpio/gpio-tz1090.txt new file mode 100644 index 00000000000..174cdf30917 --- /dev/null +++ b/Documentation/devicetree/bindings/gpio/gpio-tz1090.txt @@ -0,0 +1,88 @@ +ImgTec TZ1090 GPIO Controller + +Required properties: +- compatible: Compatible property value should be "img,tz1090-gpio". + +- reg: Physical base address of the controller and length of memory mapped + region. + +- #address-cells: Should be 1 (for bank subnodes) + +- #size-cells: Should be 0 (for bank subnodes) + +- Each bank of GPIOs should have a subnode to represent it. + + Bank subnode required properties: + - reg: Index of bank in the range 0 to 2. + + - gpio-controller: Specifies that the node is a gpio controller. + + - #gpio-cells: Should be 2. The syntax of the gpio specifier used by client + nodes should have the following values. + <[phandle of the gpio controller node] + [gpio number within the gpio bank] + [gpio flags]> + + Values for gpio specifier: + - GPIO number: a value in the range 0 to 29. + - GPIO flags: bit field of flags, as defined in <dt-bindings/gpio/gpio.h>. + Only the following flags are supported: + GPIO_ACTIVE_HIGH + GPIO_ACTIVE_LOW + + Bank subnode optional properties: + - gpio-ranges: Mapping to pin controller pins (as described in + Documentation/devicetree/bindings/gpio/gpio.txt) + + - interrupts: Interrupt for the entire bank + + - interrupt-controller: Specifies that the node is an interrupt controller + + - #interrupt-cells: Should be 2. The syntax of the interrupt specifier used by + client nodes should have the following values. + <[phandle of the interurupt controller] + [gpio number within the gpio bank] + [irq flags]> + + Values for irq specifier: + - GPIO number: a value in the range 0 to 29 + - IRQ flags: value to describe edge and level triggering, as defined in + <dt-bindings/interrupt-controller/irq.h>. Only the following flags are + supported: + IRQ_TYPE_EDGE_RISING + IRQ_TYPE_EDGE_FALLING + IRQ_TYPE_EDGE_BOTH + IRQ_TYPE_LEVEL_HIGH + IRQ_TYPE_LEVEL_LOW + + + +Example: + + gpios: gpio-controller@02005800 { + #address-cells = <1>; + #size-cells = <0>; + compatible = "img,tz1090-gpio"; + reg = <0x02005800 0x90>; + + /* bank 0 with an interrupt */ + gpios0: bank@0 { + #gpio-cells = <2>; + #interrupt-cells = <2>; + reg = <0>; + interrupts = <13 IRQ_TYPE_LEVEL_HIGH>; + gpio-controller; + gpio-ranges = <&pinctrl 0 0 30>; + interrupt-controller; + }; + + /* bank 2 without interrupt */ + gpios2: bank@2 { + #gpio-cells = <2>; + reg = <2>; + gpio-controller; + gpio-ranges = <&pinctrl 0 60 30>; + }; + }; + + |