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30 lines
894 B
30 lines
894 B
* Technologic Systems I2C-FPGA's GPIO controller bindings |
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This bindings describes the GPIO controller for Technologic's FPGA core. |
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TS-4900's FPGA encodes the GPIO state on 3 bits, whereas the TS-7970's FPGA |
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uses 2 bits: it doesn't use a dedicated input bit. |
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Required properties: |
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- compatible: Should be one of the following |
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"technologic,ts4900-gpio" |
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"technologic,ts7970-gpio" |
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- reg: Physical base address of the controller and length |
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of memory mapped region. |
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- #gpio-cells: Should be two. The first cell is the pin number. |
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- gpio-controller: Marks the device node as a gpio controller. |
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Optional property: |
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- ngpios: Number of GPIOs this controller is instantiated with, |
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the default is 32. See gpio.txt for more details. |
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Example: |
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&i2c2 { |
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gpio8: gpio@28 { |
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compatible = "technologic,ts4900-gpio"; |
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reg = <0x28>; |
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#gpio-cells = <2>; |
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gpio-controller; |
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ngpios = <32>; |
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}; |
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};
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